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1
Brunton, Elizabeth A., Sanjeev K. Srivastava, David S. Schoeman, and Scott Burnett. "Quantifying trends and predictors of decline in eastern grey kangaroo (Macropus giganteus) populations in a rapidly urbanising landscape." Pacific Conservation Biology 24, no. 1 (2018): 63. http://dx.doi.org/10.1071/pc17034.
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Human population growth and the resultant expansion of urban landscapes are drivers of biodiversity loss globally. Impacts of urbanisation on wildlife are not well understood, although the importance of preserving biodiversity in urban areas is widely recognised. The eastern grey kangaroo (Macropus giganteus), a common species of large macropod, can be found in high densities in many urban landscapes across Australia. South East Queensland is a subtropical region of Australia that has experienced high rates of urban expansion. Human population growth in the region has resulted in widespread changes to the landscape and much of the eastern grey kangaroo’s natural habitat has been modified. Declines in kangaroo populations have been anecdotally reported; however, the impact of urbanisation on kangaroo populations has not been quantified. This study used a modelling approach, collecting data from the community, and private and government organisations to: (1) map the current distribution of eastern grey kangaroos; (2) quantify trends in kangaroo abundance; and (3) identify anthropogenic drivers of changes in kangaroo abundance in the region. Of the kangaroo populations identified, 42% were reported to have undergone an overall decline in abundance since 2000. Higher human population growth rate and smaller area remaining under natural land use were predictors of kangaroo population declines. Further kangaroo declines can be anticipated in the region, particularly in areas with projected human population growth rates over 80% for the next decade. This study emphasises the importance of integrated urban development over large spatial extents to mitigate impacts of urbanisation on terrestrial mammals.
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Brunton, Elizabeth A., Sanjeev K. Srivastava, and Scott Burnett. "Spatial ecology of an urban eastern grey kangaroo (Macropus giganteus) population: local decline driven by kangaroo–vehicle collisions." Wildlife Research 45, no. 8 (2018): 685. http://dx.doi.org/10.1071/wr18077.
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Context As urban landscapes proliferate globally, the need for research into urban wildlife interactions is magnified. The eastern grey kangaroo (Macropus giganteus) is a widespread species commonly involved in wildlife–vehicle collisions in urban areas in Australia. Despite the many urban kangaroo populations and associated conflicts with human activities, few studies have examined how eastern grey kangaroos interact with, and are affected by, the urban matrix. Aims The present study aimed to quantify kangaroo demography, movements, habitat utilisation and exposure to risks during a period of intensive urban development in a rapidly changing suburb located in a region undergoing high urban growth rates. Methods We utilised foot-based census surveys, global positioning system (GPS) collars, direct observations and reports of wildlife mortality between 2014 and 2016. Geographical information systems (GIS) were used to integrate GPS-tracking data with spatial layers, to quantify kangaroo movements and habitat utilisation. Key results The kangaroo population underwent a steep decline and kangaroo–vehicle collisions were the main source of mortality (73%) during the study period. Kangaroos were regularly exposed to the risk of injury, with roads intersecting many parts of their home range. Kangaroos showed positive habitat selection both for lawn and forest habitats and kangaroo movement and presence at the study site were influenced by high-quality forage and cover. Conclusions The present research has highlighted that despite areas of suitable habitat remaining, road-kill was a major contributor to localised kangaroo-population decline. We showed that habitat preferences of eastern grey kangaroos in this urban area were consistent with those in natural landscapes. Implications The present study is the first to implicate kangaroo–vehicle collisions as the major factor in population decline in kangaroos. These findings can be utilised to guide design and placement of kangaroo–vehicle collision mitigation and assist in planning of urban areas, particularly where kangaroo populations are in decline. Local extirpation of urban kangaroo populations would be greatly reduced by incorporating site-specific kangaroo habitat preferences and existing patterns of kangaroo habitat use in infrastructure planning. The study has contributed to our understanding of the effects of roads on urban wildlife in general and highlighted the importance of landscape permeability.
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Collins, D., and K. Menz. "An Economic Perspective to the Population Management of Commercially Harvested Kangaroos." Rangeland Journal 8, no. 2 (1986): 103. http://dx.doi.org/10.1071/rj9860103.
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Both overseas and within Australia, the need for a commercial kangaroo industry is being questioned. Some groups believe that the larger kangaroo species presently being culled are under threat of extinction and that the pest status of kangaroos to agriculture is largely a myth. As the commercial kangaroo industry is export oriented, the imposition of import bans by overseas governments would significantly affect the viability of the industry. Also, agricultural producers who believe they bear the costs of maintaining kangaroo population are concerned that damage by kangaroos would become unacceptably high if their numbers were to go unchecked. The aim of this article is to put an economic perspective on the population management of commercially harvested kangaroos. The major groups in conflict are identified, along with their respective preferences regarding the appropriate level of the kangaroo population. The underlying reason for conflict, the common property characteristic of kangaroos, is examined, and an economic framework for reconciling these conflicts through population management presented. The lack of data on kangaroo numbers and the benefits and costs which various population levels have for the various interest groups remain a major impediment to quantifying an economic model for determining optimal population levels. An examination is made of relevant data and a national appraisal of the order of magnitude of kangaroo damages to agriculture is presented.
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Henderson, Timothy, Rajanathan Rajaratnam, and Karl Vernes. "Population density of eastern grey kangaroos (Macropus giganteus) in a periurban matrix at Coffs Harbour, New South Wales." Australian Mammalogy 40, no. 2 (2018): 312. http://dx.doi.org/10.1071/am17010.
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We surveyed eastern grey kangaroos at four locations at the Northern Beaches region of Coffs Harbour, New South Wales, to estimate densities in this growing peri-urban region. This region is considered a regional hotspot for human–kangaroo conflict, with numerous kangaroo-related incidents in recent years. Direct counts of kangaroos were undertaken every two months during 2016. Kangaroo densities varied between sites, ranging from 0.2 individuals ha–1 to 4.9 individuals ha–1. Because no estimates of population density exist for the Northern Beaches, our results assisted the development of a regional kangaroo management plan, and contribute to a broader understanding of eastern grey kangaroo densities in peri-urban areas.
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Descovich, Kris, Andrew Tribe, Ian J. McDonald, and Clive J. C. Phillips. "The eastern grey kangaroo: current management and future directions." Wildlife Research 43, no. 7 (2016): 576. http://dx.doi.org/10.1071/wr16027.
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The eastern grey kangaroo is a common and iconic species of Australia. Its specialised behaviour and reproduction have evolved as adaptations to the Australian environment, allowing the species to survive and flourish, despite wide climatic and seasonal variations in habitat. Across its range, the eastern grey kangaroo is harvested and subjected to population management for a variety of reasons, including localised over-abundance, livestock competition, crop grazing, native habitat conservation, animal welfare and direct threats to human safety. Population management of kangaroos is most commonly undertaken by shooting, although other methods such as reproductive control, translocation and repellents may also contribute successfully to management. Kangaroo harvesting and population control are controversial and divisive, because the kangaroo is perceived as both a national icon and as a pest species. Although a limited number of surveys have been undertaken on attitudes towards kangaroos and their management, the socio-political aspects affecting these issues are yet to be systematically investigated. Within this review we discuss the relevance of culture and language to species management and conservation, as well as the importance of scrutiny of stakeholder perceptions, motivations and values. Future directions should examine human dimensions that influence kangaroo-management decisions and conservation. The following three key aspects are recommended as research and management priorities: (1) experimental determination of whether gaps exist between actual and perceived impacts of kangaroo populations, (2) empirical investigation of how stakeholder language, culture, identity and values influence perceptions of kangaroos and their management, and (3) where population control is determined to be necessary, an incorporation of stakeholder differences within decision making to ensure best outcomes for both species conservation and population management.
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Klöcker, Ulrike, David B. Croft, and Daniel Ramp. "Frequency and causes of kangaroo - vehicle collisions on an Australian outback highway." Wildlife Research 33, no. 1 (2006): 5. http://dx.doi.org/10.1071/wr04066.
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Kangaroo–vehicle collisions are frequent on Australian highways. Despite high economic costs, detrimental effects on animal welfare, and potential impacts on population viability, little research has been done to investigate the impact of road mortality on kangaroo populations, where and why accidents occur, and how the collisions can be mitigated. We therefore collected data on species (Macropus rufus, M. giganteus, M. fuliginosus, M. robustus), sex and age of kangaroos killed on a 21.2-km bitumenised section of outback highway over 6 months in far western New South Wales, Australia. The spatial and temporal distribution of road-killed kangaroos was investigated in relation to the cover and quality of road-side vegetation, road characteristics, the density of kangaroos along the road, climatic variables and traffic volume. A total of 125 kangaroos were found killed on the road at a rate of 0.03 deaths km–1 day–1. Grey kangaroos of two species (M. giganteus, M. fuliginosus) were under-represented in the road-kill sample in comparison with their proportion in the source population estimated during the day. No bias towards either sex was found. The age structure of road-killed kangaroos was similar to age structures typical of source kangaroo populations. Road-kills mainly occurred in open plains country. In road sections with curves or stock races, road-kill frequencies were higher than expected. Greater cover and greenness of roadside vegetation at the verge probably attracted kangaroos to the road and variation in this vegetation affected the spatial distribution of road-kills. The temporal distribution of road-kills was positively correlated with the volume of night-time traffic. The probability of a kangaroo–vehicle collision increased exponentially with traffic volume. Results are discussed in relation to the potential for mitigation of kangaroo–vehicle collisions.
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Hacker, Ronald B., Michael R. Constable, and Gavin J. Melville. "A step-point transect technique for estimation of kangaroo populations in sheep-grazed paddocks." Rangeland Journal 24, no. 2 (2002): 326. http://dx.doi.org/10.1071/rj02019.
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This paper presents an empirical and theoretical evaluation of a step-point transect procedure for estimating the relative and absolute abundance of kangaroos in sheep-grazed rangeland paddocks. The method assumes that the proportion of kangaroos in the total (sheep + kangaroo) population can be estimated from their proportional representation in the dung. The actual population of kangaroos can then be estimated if the population of sheep is known. Proportional representation in the dung is estimated by the probability that dung of a given species will lie closest to a 'random' point. For operational simplicity, sample points are not strictly random but are located systematically along walked transects. The procedure was applied in seven paddocks spread throughout the Western Division of NSW and south-west Queensland where actual kangaroo and sheep populations were determined by ground survey and from station records, respectively. Dung was also collected from sample transects to allow comparison of step-point population estimates with corresponding estimates based on dung weight or pellet counts. A theoretical estimator of the kangaroo population based on step-point data was also derived and compared with actual populations estimated from ground surveys. Results indicate that the step-point transect procedure should produce acceptable estimates of both relative and absolute kangaroo populations in sheep-grazed rangeland paddocks. The appropriate equations, and minimum sample sizes, are provided. The step-point transect technique has the practical advantage that it avoids the tedious sampling procedures inherent in count- or weight-based methods. Further, in contrast to these methods, it may be expected to become both more reliable and less time consuming as the density of dung increases, thus providing the greatest operational advantage under circumstances where reliable estimation is most required.
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Brandimarti, Maquel E., Rachael Gray, Fabiola R. O. Silva, and Catherine A. Herbert. "Kangaroos at maximum capacity: health assessment of free-ranging eastern grey kangaroos on a coastal headland." Journal of Mammalogy 102, no. 3 (March 30, 2021): 837–51. http://dx.doi.org/10.1093/jmammal/gyab022.
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Abstract Sprawling urban development is fragmenting the landscape and native wildlife habitats on the Australian east coast. The impact of this rapid urbanization on wildlife health is largely unknown. This study surveyed the health of a high-density (5.4 individuals per ha) population of eastern grey kangaroos (Macropus giganteus) affected by urban encroachment and prolonged drought. Blood parameters (hematological and serum protein), trace element and heavy metal concentrations, and parasite counts (fecal worm egg counts, ticks, and mites) are reported for a sample of ≤ 54 kangaroos at Look at Me Now Headland, New South Wales, Australia. These parameters were compared to lower density kangaroo populations from other sites in New South Wales. We found the health and welfare of this population to be severely compromised, with nonregenerative anemia and nutritional deficiencies evident. Our results indicate that high-density kangaroo populations isolated by urban encroachment are at significant health risk. To prevent further decline in this population’s health, we discuss management strategies that could be employed, concurrent with ongoing health and disease monitoring, to mitigate the poor health outcomes in this population. We conclude that it is essential to retain habitat connectivity when altering land use in areas with resident kangaroo populations if managers are to maintain healthy populations.
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Shima, Amy L., Lee Berger, and Lee F. Skerratt. "Conservation and health of Lumholtz’s tree-kangaroo (Dendrolagus lumholtzi)." Australian Mammalogy 41, no. 1 (2019): 57. http://dx.doi.org/10.1071/am17030.
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Lumholtz’s tree-kangaroo (Dendrolagus lumholtzi) is an iconic species in far north Queensland yet little is known about its health or population status. Studies on this species have been conducted in a limited number of locations and focused primarily on ecology, habitat use and home-range size. The species is relatively common in the Atherton Tablelands but habitat loss, predation by domestic, feral and wild dogs, vehicle strike, low fecundity, and disease have been identified as threats to the population. We review knowledge of population ecology and threats for this species, and include a novel collation of disease reports on all tree-kangaroos with particular reference to Lumholtz’s tree-kangaroo. Health of Lumholtz’s tree-kangaroo appears to be impacted by the increase in humans and domestic animals in their range. There have been reports of melioidosis, toxoplasmosis, tick paralysis and blindness in wild tree-kangaroos. We identify where increased information on health and population viability will improve conservation and management of the species.
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Hume, Georgina, Elizabeth Brunton, and Scott Burnett. "Eastern Grey Kangaroo (Macropus giganteus) Vigilance Behaviour Varies between Human-Modified and Natural Environments." Animals 9, no. 8 (July 27, 2019): 494. http://dx.doi.org/10.3390/ani9080494.
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Rapid increases in urban land use extent across the globe are creating challenges for many wildlife species. Urban landscapes present a novel environment for many species, yet our understanding of wildlife behavioural adaptations to urban environments is still poor. This study compared the vigilance behaviour of a large mammal in response to urbanisation at a landscape level. Here, we investigate urban (n = 12) and non-urban (n = 12) populations of kangaroos in two regions of Australia, and the relationship between kangaroo vigilance and urbanisation. We used a linear modelling approach to determine whether anti-predator vigilance and the number of vigilant acts performed were influenced by land use type (i.e., urban or non-urban), human population densities, kangaroo demographics, and environmental factors. Kangaroo behaviour differed between the two study regions; kangaroo vigilance was higher in urban than non-urban sites in the southern region, which also had the highest human population densities, however no effect of land use was found in the northern region. Season and sex influenced the vigilance levels across both regions, with higher levels seen in winter and female kangaroos. This study is the first to compare urban and non-urban vigilance of large mammals at a landscape level and provide novel insights into behavioural adaptations of large mammals to urban environments.
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Thomsen, D. A., and J. Davies. "Social and cultural dimensions of commercial kangaroo harvest in South Australia." Australian Journal of Experimental Agriculture 45, no. 10 (2005): 1239. http://dx.doi.org/10.1071/ea03248.
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Kangaroo management is important to the sustainability of Australia’s rangeland landscapes. The commercial harvest of kangaroos assists in reduction of total grazing pressure in the rangelands and provides the potential for supplementary income to pastoralists. Indeed, the commercial kangaroo industry is considered by natural resource scientists as one of the few rural industry development options with potential to provide economic return with minimal environmental impact. While the biology and population ecology of harvested kangaroo species in Australia is the subject of past and present research, the social, institutional and economic issues pertinent to the commercial kangaroo industry are not well understood. Our research is addressing the lack of understanding of social issues around kangaroo management, which are emerging as constraints on industry development. The non-indigenous stakeholders in kangaroo harvest are landholders, regional management authorities, government conservation and primary production agencies, meat processors, marketers and field processors (shooters) and these industry players generally have little understanding of what issues the commercial harvest of kangaroos presents to Aboriginal people. Consequently, the perspectives and aspirations of Aboriginal people regarding the commercial harvest of kangaroos are not well considered in management, industry development and planning. For Aboriginal people, kangaroos have subsistence, economic and cultural values and while these values and perspectives vary between language groups and individuals, there is potential to address indigenous issues by including Aboriginal people in various aspects of kangaroo management. This research also examines the Aboriginal interface with commercial kangaroo harvest, and by working with Aboriginal people and groups is exploring several options for greater industry involvement. The promotion of better understandings between indigenous and non-indigenous people with interests in kangaroo management could promote industry development through the marketing of kangaroo as not only clean and green, but also as a socially just product.
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Mills, Jacqueline. "Market Forces and Kangaroos: The New South Wales Kangaroo Management Plan." Society & Animals 14, no. 3 (2006): 295–304. http://dx.doi.org/10.1163/156853006778149208.
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AbstractIn contemporary times, wildlife managers attempt to provide solutions to problems arising from conflicting uses of the environment by humans and nonhuman animals. Within the Kangaroo Management Zones of New South Wales (NSW), the commercial culling "solution" is one such attempt to perpetuate kangaroo populations on pastoral land while supporting farmers in continuing inefficient sheep farming. Because wildlife management rests on a distinction between the "nature" of humans and animals, then humanist attention to standards of individual welfare need not interrupt the process whereby individual animals are killed within an economic framework designed to improve habitat management for the conservation of their populations. Building on Thorne's (1998) discussion of the meanings scripted onto individual kangaroo bodies, this paper explores the utilitarian underpinnings of the commercialization approach and considers the ethical implications of constructing the population as resource, even if this results in an improvement in the welfare of individual kangaroos.
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Brunton, Bolin, Leon, and Burnett. "Fright or Flight? Behavioural Responses of Kangaroos to Drone-Based Monitoring." Drones 3, no. 2 (April 24, 2019): 41. http://dx.doi.org/10.3390/drones3020041.
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: Drones are often considered an unobtrusive method of monitoring terrestrial wildlife; however research into whether drones disturb wildlife is in its early stages. This research investigated the potential impacts of drone monitoring on a large terrestrial mammal, the eastern grey kangaroo (Macropus giganteus), in urban and peri-urban environments. We assessed the response of kangaroos to drone monitoring by analysing kangaroo behaviour prior to and during drone deployments using a linear modelling approach. We also explored factors that influenced kangaroo responses including drone altitude, site characteristics and kangaroo population dynamics and demographics. We showed that drones elicit a vigilance response, but that kangaroos rarely fled from the drone. However, kangaroos were most likely to flee from a drone flown at an altitude of 30 m. This study suggests that drone altitude is a key consideration for minimising disturbance of large terrestrial mammals and that drone flights at an altitude of 60–100 m above ground level will minimise behavioural impacts. It also highlights the need for more research to assess the level of intrusion and other impacts that drone surveys have on the behaviour of wildlife and the accuracy of the data produced.
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Webley, L. S., I. Beveridge, and G. Coulson. "Endoparasites of an insular subspecies of the western grey kangaroo, Macropus fuliginosus." Australian Journal of Zoology 52, no. 6 (2004): 623. http://dx.doi.org/10.1071/zo04011.
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This study examined parasites occurring in the insular subspecies of the western grey kangaroo, Macropus fuliginosus fuliginosus, from Kangaroo Island. A total of 25 kangaroos from three sites were examined for gastrointestinal parasites. Fifteen parasite species were identified: eight in the stomach, five in the small intestine and two in the large intestine. Parasite prevalence showed a bimodal distribution: 'satellite' species were predominantly cestodes, whereas 'core' species were nematodes. There was no evidence of co-speciation in the 12 parasite species occurring in both island and mainland western grey kangaroo subspecies. M. f. fuliginosus harboured fewer parasite species than M. f. melanops from the Fleurieu Peninsula, South Australia. This might be related to parasite prevalence and the intensity of infection in the original population of kangaroos. Alternatively, it might be related to differing environmental conditions or to chance. Host switching was evident, with Cloacina kartana, which has been recorded as a common parasite of the tammar wallaby, Macropus eugenii, also occurring in some kangaroos.
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Lee, E., U. Klöcker, DB Croft, and D. Ramp. "Kangaroo-vehicle collisions in Australia's sheep rangelands, during and following drought periods." Australian Mammalogy 26, no. 2 (2004): 215. http://dx.doi.org/10.1071/am04215.
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The effects of roads on wildlife behaviour and ecological function are poorly known in arid Australia. The most obvious impact is roadkill from wildlife-vehicle collisions. Therefore we collected statistics on kangaroo-vehicle collisions, investigated the causal factors of these collisions, and related roadkill mortality to the population structure, size and distribution of four kangaroo species in two intensive six month studies during and following drought. The research was conducted along a 21.2 km sealed section of the Silver City Highway between Broken Hill and Tibooburra that passes through the University of New South Wales (NSW) Arid Zone Research Station at ‘Fowlers Gap’ in north-western NSW. The rate of roadkill was higher during drought (20.8 roadkills month-1) than non-drought (2.6 roadkills month-1). Affected species were red kangaroos (Macropus rufus), euros (Macropus robustus erubescens), western grey kangaroos (Macropus fuliginosus) and eastern grey kangaroos (Macropus giganteus). During drought, M. fuliginosus and M. giganteus were killed in lower proportions than their proportion in the source population, otherwise species were killed in proportion to their density along the road. There were no sex biases but male M. r. erubescens were much more likely to be beside the road than females and thus were killed more often during drought. The majority of roadkills were young individuals around 2 years old. Curves and stockraces along the road significantly increased the likelihood of roadkills. Likewise the frequency of roadkills was a function of the kangaroo population density along the road, night time traffic volume, low rainfall and higher vegetation cover and greenness along the road relative to surrounding areas. We evaluate the relationships between these causal factors and kangaroovehicle collisions, and discuss the possible effects of these collisions on kangaroo population structure under drought and post-drought conditions.
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Pople, AR, SC Cairns, TF Clancy, GC Grigg, LA Beard, and CJ Southwell. "Comparison of Surveys of Kangaroos in Queensland Using Helicopters and Fixed-Wing Aircraft." Rangeland Journal 20, no. 1 (1998): 92. http://dx.doi.org/10.1071/rj9980092.
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Kangaroo harvest quotas for each Australian state have been set mainly as proportions of population estimates derived from aerial surveys. Estimating population size from strip transect counts using fixed- wing aircraft has become an established technique, but counts must be adjusted by correction factors to ensure population estimates are both accurate and repeatable. Surveys of kangaroos in Queensland are currently conducted with helicopters using line transect methodology, but cost restricts their use to relatively small survey blocks. Nevertheless, they return more accurate and repeatable estimates of kangaroo density than surveys with fixed-wing aircraft. A comparison of the above two techniques was made along the same transect lines in seven survey blocks (5000-10,000 km2) in southern and western Queensland, allowing an assessment of the comparative accuracy of the fixed-wing method. For red kangaroos (Macropus rufus), required correction factors of 0.7-3.1 were similar to those used previously. However, for eastern grey kangaroos (M. giganteus), substantially larger correction factors of 3.4-10.2 were needed to approach true density. For wallaroos (M. robustus), correction factors of 3.8-4.8 were required, but can be considered conservative because helicopter-derived density estimates are known to be underestimated by a factor of 2-3. Further work is needed to establish how correction factors for each species should be applied on a broader scale and whether they lead to repeatable estimates of kangaroo density. Key words: aerial survey, line transect, correction factors, strip transect, wallaroo.
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Cairns, S. C., G. W. Lollback, and N. Payne. "Design of aerial surveys for population estimation and the management of macropods in the Northern Tablelands of New South Wales, Australia." Wildlife Research 35, no. 4 (2008): 331. http://dx.doi.org/10.1071/wr07079.
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As part of a kangaroo management program, eastern grey kangaroos (Macropus giganteus) and common wallaroos (M. robustus robustus) are harvested from three kangaroo management zones in north-eastern New South Wales, Australia. To set sustainable harvest quotas, it is necessary to obtain reasonably accurate estimates of the sizes of the populations of these two species of macropod. Recently, this has been done on two occasions using helicopter line-transect surveys. For the most recent of these surveys, conducted in 2004, each management zone was subdivided into three strata of increasing kangaroo density and the surveys were designed in relation to this stratification using an automated survey design algorithm. The results of the surveys were that eastern grey kangaroo densities were estimated as 8.11 ± 1.81 km–2 in the Glen Innes zone, 10.23 ± 2.41 km–2 in the Armidale zone and 4.82 ± 0.87 km–2 in the Upper Hunter zone. Wallaroo densities for these three zones were 3.06 ± 0.73 km–2, 5.68 ± 3.45 km–2 and 4.40 ± 1.01 km–2 respectively. The wallaroo densities were determined by multiplying the initial estimated densities by a correction factor of 1.85. Across the three kangaroo management zones, eastern grey kangaroo densities did not change in any significant way between the two surveys. This was also the case for wallaroos in the Glen Innes and Armidale zones. Wallaroo density in the Upper Hunter zone, however, increased significantly between the two surveys. Over a decade before these surveys were conducted, a series of ground surveys using walked line-transect sampling were undertaken. The density estimates derived from the helicopter surveys proved to be broadly comparable to those derived from the ground surveys, suggesting that conducting helicopter line-transect surveys designed using the method deployed here is effective in producing population estimates for the purpose of kangaroo management.
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Pople, AR. "Population monitoring for kangaroo management." Australian Mammalogy 26, no. 1 (2004): 37. http://dx.doi.org/10.1071/am04037.
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In wildlife management, the program of monitoring will depend on the management objective. If the objective is damage mitigation, then ideally it is damage that should be monitored. Alternatively, population size (N) can be used as a surrogate for damage, but the relationship between N and damage obviously needs to be known. If the management objective is a sustainable harvest, then the system of monitoring will depend on the harvesting strategy. In general, the harvest strategy in all states has been to offer a quota that is a constant proportion of population size. This strategy has a number of advantages over alternative strategies, including a low risk of over- or underharvest in a stochastic environment, simplicity, robustness to bias in population estimates and allowing harvest policy to be proactive rather than reactive. However, the strategy requires an estimate of absolute population size that needs to be made regularly for a fluctuating population. Trends in population size and in various harvest statistics, while of interest, are secondary. This explains the large research effort in further developing accurate estimation methods for kangaroo populations. Direct monitoring on a large scale is costly. Aerial surveys are conducted annually at best, and precision of population estimates declines with the area over which estimates are made. Management at a fine scale (temporal or spatial) therefore requires other monitoring tools. Indirect monitoring through harvest statistics and habitat models, that include rainfall or a greenness index from satellite imagery, may prove useful.
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Lethbridge, Mark, Michael Stead, and Cameron Wells. "Estimating kangaroo density by aerial survey: a comparison of thermal cameras with human observers." Wildlife Research 46, no. 8 (2019): 639. http://dx.doi.org/10.1071/wr18122.
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Abstract ContextAerial surveys provide valuable information about the population status and distribution of many native and pest vertebrate species. They are vital for evidence-based monitoring, budget planning and setting management targets. Despite aircraft running costs, they remain one of the most cost-effective ways to capture distribution and abundance data over a broad area. In Australia, annual surveys of large macropods are undertaken in several states to inform management, and in some jurisdictions, to help set commercial kangaroo harvest quotas. Improvements in the cost efficiencies of these surveys are continually sought. Aerial thermal imaging techniques are increasingly being tested for wildlife surveys, but to date no studies have directly compared population data derived from thermal imaging with data collected by human observers during the same flight. AimsDuring an aerial survey of western grey kangaroos (Macropus fuliginosus), eastern grey kangaroos (M. giganteus) and red kangaroos (Osphranter rufus) across the state of Victoria, Australia, the objective was to conduct a direct comparison of the effectiveness of thermal camera technology and human observers for estimating kangaroo populations from aerial surveys. MethodsA thermal camera was mounted alongside an aerial observer on one side of the aircraft for a total of 1360km of transect lines. All thermal footage was reviewed manually. Population density estimates and distance sampling models were compared with human observer counts. Key resultsOverall, the kangaroo density estimates obtained from the thermal camera data were around 30% higher than estimates derived from aerial observer counts. This difference was greater in wooded habitats. Conversely, human-derived counts were greater in open habitats, possibly due to interference from sunlight and flushing. It was not possible to distinguish between species of macropod in the thermal imagery. ConclusionsThermal survey techniques require refining, but the results of the present study suggest that with careful selection of time of day for surveys, more accurate population estimates may be possible than with conventional aerial surveys. ImplicationsConventional aerial surveys may be underestimating animal populations in some habitats. Further studies that directly compare the performance of aerial observers and thermal imaging are required across a range of species and habitats.
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Power, Michelle L., Nicholas C. Sangster, Martin B. Slade, and Duncan A. Veal. "Patterns of Cryptosporidium Oocyst Shedding by Eastern Grey Kangaroos Inhabiting an Australian Watershed." Applied and Environmental Microbiology 71, no. 10 (October 2005): 6159–64. http://dx.doi.org/10.1128/aem.71.10.6159-6164.2005.
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ABSTRACT The occurrence of Cryptosporidium oocysts in feces from a population of wild eastern grey kangaroos inhabiting a protected watershed in Sydney, Australia, was investigated. Over a 2-year period, Cryptosporidium oocysts were detected in 239 of the 3,557 (6.7%) eastern grey kangaroo fecal samples tested by using a combined immunomagnetic separation and flow cytometric technique. The prevalence of Cryptosporidium in this host population was estimated to range from 0.32% to 28.5%, with peaks occurring during the autumn months. Oocyst shedding intensity ranged from below 20 oocysts/g feces to 2.0 × 106 oocysts/g feces, and shedding did not appear to be associated with diarrhea. Although morphologically similar to the human-infective Cryptosporidium hominis and the Cryptosporidium parvum “bovine” genotype oocysts, the oocysts isolated from kangaroo feces were identified as the Cryptosporidium “marsupial” genotype I or “marsupial” genotype II. Kangaroos are the predominant large mammal inhabiting Australian watersheds and are potentially a significant source of Cryptosporidium contamination of drinking water reservoirs. However, this host population was predominantly shedding the marsupial-derived genotypes, which to date have been identified only in marsupial host species.
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Glass, Ruth, David M. Forsyth, Graeme Coulson, and Marco Festa-Bianchet. "Precision, accuracy and bias of walked line-transect distance sampling to estimate eastern grey kangaroo population size." Wildlife Research 42, no. 8 (2015): 633. http://dx.doi.org/10.1071/wr15029.
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Context Distance sampling is widely used to estimate the size of wildlife populations, including kangaroos. However, the performance of distance-sampling abundance estimates has seldom been evaluated for wild mammal populations of known size. Aims We evaluated the precision, accuracy, bias and interval coverage of abundance estimates from walked line-transect sampling, a commonly used distance-sampling method, for a marked free-ranging population of eastern grey kangaroos (Macropus giganteus) at Yanakie Isthmus, Wilsons Promontory National Park, south-eastern Australia. Methods In each of two study periods (November 2012 and May 2013) we first determined the true size of the uniquely marked kangaroo population by conducting 10 intensive searches of the study area. We then conducted distance sampling along six systematically spaced line transects. We walked each transect four times in November 2012 and seven times in May 2013. Data were analysed using Program DISTANCE. Key results Our intensive searches revealed that 141 and 124 collared kangaroos were present in the study area in November 2012 and May 2013, respectively. When transects were walked four or more times (i.e. ≥400 observations), maximum precision (coefficient of variation; CV of ~13%) was achieved in both survey periods. Walking transects twice (i.e. ~200 observations) produced abundance estimates with CVs of <20% in each study period. The accuracy (root mean square error) of abundance estimates varied from 1 to 13 (November 2012) and from 3 to 28 (May 2013). Bias ranged from −9% to +23%, but stabilised at between −1% and −9% when transects were walked four or more times in each study period. The 95% confidence intervals for the abundance estimates always included the true population size. Conclusions Our results indicated that walked line-transect distance sampling is a precise and accurate method for estimating eastern grey kangaroo abundance. The small negative biases that occurred when sample sizes were large were likely to be due to some animals moving outside the study area. Implications Provided that the key design elements and assumptions are met, estimates of kangaroo abundance from walked line-transect distance sampling should have good precision (CV < 20%) and minimal (<10%) bias.
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Perry, RJ, and ML Braysher. "A Technique for Estimating the Numbers of Eastern Gray Kangaroos, Macropus-Giganteus, Grazing a Given Area of Pasture." Wildlife Research 13, no. 3 (1986): 335. http://dx.doi.org/10.1071/wr9860335.
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This paper outlines a technique for estimating, by means of faecal pellet counts, the absolute number of eastern grey kangaroos, Macropus giganteus, grazing on a given area in the A.C.T. Absolute numbers were obtained by comparing relative density of pellets on the area to be assessed, with pellet density in the grey kangaroo enclosure at Tidbinbilla Nature Reserve, which has a known area and a known kangaroo population. The decay rate of pellets in three different areas did not vary significantly. The average number of pellets per pellet group was similar in all three areas, but during drought kangaroos tended to drop fewer pellets per group. However, the potential error caused by this can be avoided if the control and test areas are assessed at the same time. The problem of defining a group is eliminated by counting individual pellets rather than groups.
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McLeod, S. R., and R. B. Hacker. "Balancing stakeholder interests in kangaroo management – historical perspectives and future prospects." Rangeland Journal 41, no. 6 (2019): 567. http://dx.doi.org/10.1071/rj19055.
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Kangaroos are commercially harvested in five mainland states of Australia, with the harvest regulated by state government wildlife management agencies and overseen by the Commonwealth government. Non-commercial culling is permitted, and although most kangaroos have traditionally been taken by the commercial kangaroo harvesting industry, the proportion taken non-commercially has increased in recent years. Management plans that guide the regulation of the harvest support the management objectives of wildlife management agencies and the kangaroo industry, but the plans do not successfully address the objectives of other stakeholders including pastoralists and animal protection groups, which focus on minimising the grazing impacts of kangaroos and animal welfare issues respectively. We reviewed the objectives outlined in the management plans for kangaroos in the Australian rangelands and examined alternative systems for managing natural resources to identify if improvements to management could be made. Current management plans for kangaroos principally use fixed harvest rates that are responsive only to the state of the kangaroo population and not to changes in the environments in which kangaroos live. This type of management is reactive, and opportunities for improving management of the environment are limited. A viable alternative is active adaptive management which focuses on explicit measurement of the response of the natural system to management actions and use of this information to modify interventions to better meet management objectives. Active adaptive management is appropriate when management actions can strongly influence system state but the impacts of management are uncertain. We argue that the management of kangaroos and the environments in which they live would benefit from the adoption of an active adaptive management approach by wildlife management agencies.
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Adderton, HC. "Long-acting contraceptives: a new tool to manage overabundant kangaroo populations in nature reserves and urban areas.." Australian Mammalogy 26, no. 1 (2004): 67. http://dx.doi.org/10.1071/am04067.
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When kangaroo populations reach high numbers in reserves and parkland near urban areas there are a number of implications. The animals may pose a risk to their own welfare as the population expands, have a negative effect on other aspects of the local biodiversity or impinge on human activities. In such cases active management of the population may be sought to ameliorate the negative effects. Traditional control techniques such as culling are often out of the question in these circumstances due to social pressures and concerns for human safety. In this paper I review three fertility control techniques that are potential management tools for these situations. Surgical sterilisation is a fertility control technique that has been used in a number of high profile situations. It is probably the most well established method of fertility control, is permanent, but is invasive and stressful. New biotechnological approaches to fertility control, such as the use of steroidal and non-steroidal contraceptives, are currently being trialled on kangaroos. These include the synthetic progestin levonorgestrel and the GnRH agonist deslorelin. These contraceptive agents are capable of successfully reducing the fertility of kangaroos for a range of durations depending on the agent used. Such contraceptive agents are likely to be a useful tool to manage both captive kangaroo populations and those in parkland areas. The development of a remote delivery technique will increase their efficacy for use in wild populations.
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Cristescu, Romane, Valma Cahill, William B. Sherwin, Kathrine Handasyde, Kris Carlyon, Desley Whisson, Catherine A. Herbert, Britt Louise J. Carlsson, Alan N. Wilton, and Des W. Cooper. "Inbreeding and testicular abnormalities in a bottlenecked population of koalas (Phascolarctos cinereus)." Wildlife Research 36, no. 4 (2009): 299. http://dx.doi.org/10.1071/wr08010.
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Habitat destruction and fragmentation, interactions with introduced species or the relocation of animals to form new populations for conservation purposes may result in a multiplication of population bottlenecks. Examples are the translocations of koalas to French Island and its derivative Kangaroo Island population, with both populations established as insurance policies against koala extinction. In terms of population size, these conservation programs were success stories. However, the genetic story could be different. We conducted a genetic investigation of French and Kangaroo Island koalas by using 15 microsatellite markers, 11 of which are described here for the first time. The results confirm very low genetic diversity. French Island koalas have 3.8 alleles per locus and Kangaroo Island koalas 2.4. The present study found a 19% incidence of testicular abnormality in Kangaroo Island animals. Internal relatedness, an individual inbreeding coefficient, was not significantly different in koalas with testicular abnormalities from that in other males, suggesting the condition is not related to recent inbreeding. It could instead result from an unfortunate selection of founder individuals carrying alleles for testicular abnormalities, followed by a subsequent increase in these alleles’ frequencies through genetic drift and small population-related inefficiency of selection. Given the low diversity and possible high prevalence of deleterious alleles, the genetic viability of the population remains uncertain, despite its exponential growth so far. This stands as a warning to other introductions for conservation reasons.
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Cypher, Brian L., Lawrence R. Saslaw, Christine L. Van Horn Job, Tory L. Westall, and Alexandria Y. Madrid. "Kangaroo Rat Population Response to Seismic Surveys for Hydrocarbon Reserves." Journal of Fish and Wildlife Management 7, no. 1 (February 1, 2016): 65–71. http://dx.doi.org/10.3996/072015-jfwm-066.
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Abstract Seismic surveys are a method used to locate commercially producible deposits of crude oil and natural gas. These surveys entail generating energy waves that reflect off of subterranean strata and return to the surface where they are recorded and interpreted. In the southern San Joaquin Valley of California, a region rich in hydrocarbon deposits, the two common methods of creating these energy waves include detonating buried explosive charges (“shot-hole” method) and generating strong ground-penetrating vibrations (“vibroseis” method). However, this region also supports many species of conservation concern, including several endemic species of kangaroo rats (Dipodomys spp.). We investigated the effects of a seismic survey on kangaroo rats, including two rare species, the giant kangaroo rat Dipodomys ingens and the short-nosed kangaroo rat Dipodomys nitratoides brevinasus, to determine whether seismic survey activities reduced kangaroo rat abundance, survival, or condition. In 2011, we established 18 study plots: eight subjected to shot-holes, six subjected to vibroseis, and eight controls with no energy source activities. A live-trap grid consisting of 30 traps was established on each plot, and kangaroo rats were captured and marked for four consecutive nights during trapping sessions 1–2 wk before the seismic survey (presurvey), 1–2 wk after the survey (postsurvey), and 5 mo after the survey (long term). Based on capture rates of unique individuals, abundance was similar among shot-hole, vibroseis, and control plots in each of the trapping sessions. Based on recaptures of marked individuals from previous sessions, survival was similar among treatments. Based on mass measurements, condition was similar among treatments. We did not detect adverse impacts to kangaroo rats from a seismic survey; in part, the lack of impacts detected may have been attributable to mitigation measures implemented to avoid or reduce adverse effects. These measures included restricting vibroseis trucks to existing roads, limiting off-road vehicle activity to small tractor-mounted drilling rigs with balloon tires, and attempting to avoid all kangaroo rat burrows by at least 10 m. Similar measures are recommended for any future seismic surveys in this region and elsewhere when burrowing species of conservation concern may be present.
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Cristescu, Romane, Valma Cahill, William B. Sherwin, Kathrine Handasyde, Kris Carlyon, Desley Whisson, Catherine A. Herbert, Britt Louise J. Carlsson, Alan N. Wilton, and Des W. Cooper. "Corrigendum to: Inbreeding and testicular abnormalities in a bottlenecked population of koalas (Phascolarctos cinereus)." Wildlife Research 39, no. 4 (2012): 374. http://dx.doi.org/10.1071/wr08010_co.
Full textAbstract:
Habitat destruction and fragmentation, interactions with introduced species or the relocation of animals to form new populations for conservation purposes may result in a multiplication of population bottlenecks. Examples are the translocations of koalas to French Island and its derivative Kangaroo Island population, with both populations established as insurance policies against koala extinction. In terms of population size, these conservation programs were success stories. However, the genetic story could be different. We conducted a genetic investigation of French and Kangaroo Island koalas by using 15 microsatellite markers, 11 of which are described here for the first time. The results confirm very low genetic diversity. French Island koalas have 3.8 alleles per locus and Kangaroo Island koalas 2.4. The present study found a 19% incidence of testicular abnormality in Kangaroo Island animals. Internal relatedness, an individual inbreeding coefficient, was not significantly different in koalas with testicular abnormalities from that in other males, suggesting the condition is not related to recent inbreeding. It could instead result from an unfortunate selection of founder individuals carrying alleles for testicular abnormalities, followed by a subsequent increase in these alleles' frequencies through genetic drift and small population-related inefficiency of selection. Given the low diversity and possible high prevalence of deleterious alleles, the genetic viability of the population remains uncertain, despite its exponential growth so far. This stands as a warning to other introductions for conservation reasons.
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Masters, Pip, Toni Duka, Steve Berris, and Graeme Moss. "Koalas on Kangaroo Island: from introduction to pest status in less than a century." Wildlife Research 31, no. 3 (2004): 267. http://dx.doi.org/10.1071/wr03007.
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In less than a century the ecological profile of koalas on Kangaroo Island has shifted from that of a species introduced for conservation purposes to one of pest status. Between 1923 and 1925, 18 koalas were released on Kangaroo Island. Their numbers increased rapidly and in 1997 a population-control program was implemented based on a population estimate of 5000 koalas. During the course of this program, it became clear that the koala population on Kangaroo Island was much greater and more widely distributed than previously thought, hence a more comprehensive population survey was carried out.In 2000–01 the koala population size was calculated using a stratified sampling approach based on five 'catchment units' and three habitat classifications that were known to support koalas. The koala population was estimated to be ~27 000 koalas in 2001. There were substantial differences in koala density in the low-, medium- and high-quality habitat within each catchment unit, and therefore large differences in the spatial distribution of koalas across Kangaroo Island. This revised population estimate has substantial ramifications for the Kangaroo Island Koala Management Program that was set in place in 1997.
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Coulson, G. "Use of heterogeneous habitat by the western grey kangaroo, Macropus fuliginosus." Wildlife Research 20, no. 2 (1993): 137. http://dx.doi.org/10.1071/wr9930137.
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The western grey kangaroo, Macropus fuliginosus, typically occurs at highest population densities in areas of greatest habitat heterogeneity. Hattah-Kulkyne National Park, in semiarid north-western Victoria, supports a relatively high density of this species, and has a mosaic of four major vegetation associations: mallee, woodland, lake bed and grassland. The patterns of habitat use by western grey kangaroos at Hattah-Kulkyne were examined from March 1983 until May 1985 using line-transect surveys to estimate population density in each habitat, and radio-tracking to estimate home range. The population was not dispersed randomly, but generally exhibited either positive or negative preferences for each of the four habitats in early morning and at midday, and on different bimonthly surveys. These preferences often reversed between times of day and between surveys. Home ranges of individuals ranged from 221 to 459 ha (asymptotic MAP[O.95] estimates), each encompassing three or four habitat types, and there was extensive spatial and temporal overlap between individuals. Kangaroos at Hattah-Kulkyne thus alternated between adjacent habitats that offered a range of forage conditions and shelter.
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Pople, A. R. "Frequency and precision of aerial surveys for kangaroo management." Wildlife Research 35, no. 4 (2008): 340. http://dx.doi.org/10.1071/wr07066.
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The appropriate frequency and precision for surveys of wildlife populations represent a trade-off between survey cost and the risk of making suboptimal management decisions because of poor survey data. The commercial harvest of kangaroos is primarily regulated through annual quotas set as proportions of absolute estimates of population size. Stochastic models were used to explore the effects of varying precision, survey frequency and harvest rate on the risk of quasiextinction for an arid-zone and a more mesic-zone kangaroo population. Quasiextinction probability increases in a sigmoidal fashion as survey frequency is reduced. The risk is greater in more arid regions and is highly sensitive to harvest rate. An appropriate management regime involves regular surveys in the major harvest areas where harvest rate can be set close to the maximum sustained yield. Outside these areas, survey frequency can be reduced in relatively mesic areas and reduced in arid regions when combined with lowered harvest rates. Relative to other factors, quasiextinction risk is only affected by survey precision (standard error/mean × 100) when it is >50%, partly reflecting the safety of the strategy of harvesting a proportion of a population estimate.
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Collin, Vellyza, Buyung Keraman, and Damayanti Damayanti. "The Relationship of Education and Parity With Kangaroo Care Method at Room Tebing Tinggi Hospital Perinatology Year." Jurnal Sains Kesehatan 25, no. 3 (December 11, 2018): 41–50. http://dx.doi.org/10.37638/jsk.25.3.41-50.
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One of indicators in the successful health affair in a country is the number of infant mortality rate. Causes of mortality among others are respiratory disorders 37%, prematurity 34%, sepsis 12%, hypothermia 7%, post mature 3% and congenital defect 1% and blood defect or icterus 6%. Infant mortality due to hypothermia can be prevented by practical method as an alternative to incubator namely Kangaroo Care Method. The implementation of Kangaroo Care Method must be monitored and evaluated by health care provider especially the ners. This research aims to study the relationship between education and parity with kangaroo care method in Tebing Tinggi Hospital Perinatology Space Year in 2017. This research uses descriptive design korelational with the approach of cross sectional study design. The population in this studyall infants born with low birth weight in room Tebing Tinggi Hospital Perinatology In 2017 there were 42 babies using total sampling. Collecting data in this study by looking at the data dukementasi using univariate and bivariate analysis using statistical test Chi-Square Test and Contingency Coefficient (C). The results showed: of the 42 respondents there were 25 people (61.9%) did not do kangaroo care method, 23 people (54.8%) with primary education, 27 people (64.3%) with parity primiparous, there is a significant relationship between education and care in the kangaroo method Tebing Tinggi Hospital Perinatology Space Year in 2017 with a close relationship category, and there is a significant relationship between parity with the treatment method of kangaroos in Space Perinatology General Hospital Tebing Tinggi Year 2017, with the category of close relationship. Keywords: education, kangaroo care, parity
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Coulson, G. "The Influence of population density and habitat on grouping in the western grey kangaroo, Macropus fuliginosus." Wildlife Research 20, no. 2 (1993): 151. http://dx.doi.org/10.1071/wr9930151.
Full textAbstract:
Population density and habitat structure have been identified as influencing grouping patterns in kangaroos, but the separate contributions of each factor have rarely been distinguished. Grouping was examined in the western grey kangaroo, Macropus fuliginosus, at Hattah-Kulkyne National Park, north-western Victoria, where the population exhibits marked changes in density throughout habitats that provide a range of cover. Group size and population density in each habitat were surveyed at two times of day and at roughly 2-monthly intervals from March 1983 until December 1985. Of the four major habitats, mallee and woodland offered moderate cover, whereas grassland and lake bed gave sparse cover. Visibility of kangaroo groups was highest in the sparse habitats, and was positively related to the size of the group, at least in the lower range of group sizes. At densities up to 40km-2, groups that formed in the sparse habitats were larger than the groups in the two habitats that offered moderate cover. Three habitats (lake bed, grassland and woodland) had more smaller and more larger groups than expected if group formation was a random process. Large males were seen alone more often than expected by chance in lake bed, and less often in moderate cover; females with young-atfoot were over-represented as singletons in all four habitats. The size and composition of groups recorded in this study suggest that the basic components of the social organisation of kangaroos are best discerned in habitats that carry a low population density, but that also provide the most cover.
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Pople, A. R., S. C. Cairns, N. Menke, and N. Payne. "Estimating the abundance of eastern grey kangaroos (Macropus giganteus) in south-eastern New South Wales, Australia." Wildlife Research 33, no. 2 (2006): 93. http://dx.doi.org/10.1071/wr05021.
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To provide an estimate of kangaroo numbers for harvest management, a survey was designed for an area of 29 500 km2 encompassing the agricultural and grazing lands of the Braidwood, Cooma, Goulburn, Gundagai and Yass Rural Lands Protection Board (RLPB) districts in south-east New South Wales. An aerial survey using a helicopter was considered more efficient than ground survey because of the size of the area, relatively high relief and dense tree cover, and the need for regular monitoring. Tree cover and landscape relief was used to stratify the five RLPB districts into areas of probable high, medium and low kangaroo density. Kangaroo density estimated from helicopter surveys conducted in the Northern Tablelands of New South Wales was used to suggest densities and thereby allocate survey effort in each stratum. A survey comprising 735 km of transect line was conducted in winter 2003 with a target precision of 20%. The survey returned an estimate of 286 600 ± 32 300 eastern grey kangaroos for the whole of the proposed south-east New South Wales kangaroo-management zone. In 2004, a trial harvest of slightly less than 15% of this estimate was taken. Success of the trial will be determined by the impact of harvesting on the population’s dynamics, by landholder and industry participation, and by the capacity to monitor population size, harvest offtake and compliance with regulations.
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Poole, WE, JT Wood, and NG Simms. "Distribution of the tammar, Macropus eugenii, and the relationships of populations as determined by cranial morphometrics." Wildlife Research 18, no. 5 (1991): 625. http://dx.doi.org/10.1071/wr9910625.
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Apparently once widespread throughout dense thickets in south-western Australia, the tammar is now much restricted in its distribution. On mainland Australia, isolated populations still persist in Western Australia, but in South Australia, where there is little remaining evidence to confirm that it extended beyond Eyre Peninsula, the wallaby is probably close to extinction. All originally recorded populations on five islands in Western Australia remain, but in South Australia all natural island populations, other than those on Kangaroo I., appear to be extinct. Morphometric analyses of crania representative of most known populations provide a means of assessing their relationships. Canonical variate analysis, the derivation of Mahalanobis distances and subsequent calculation of minimum spanning trees supported the existence of affinities within three major regional groups-a group predominantly from Western Australia, a group from Kangaroo and Greenly Is, South Australia, and a group from New Zealand-all apparently related via a population from Eyre Peninsula, presumably representative of a former widespread mainland population. By cranial criteria, feral tammars established in New Zealand are South Australian in origin although probably not introduced from Kangaroo I.
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Coulson, Graeme. "Male Bias in Road-kills of Macropods." Wildlife Research 24, no. 1 (1997): 21. http://dx.doi.org/10.1071/wr96004.
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I determined the sex of a total of 251 road-kills of six macropod species in southern Australia over a 13-year period. There was a significant bias towards males in five species, ranging from 65 to 92% males, but there was no difference from parity in the red kangaroo, Macropus rufus. Male eastern grey kangaroos, M. giganteus, and male western grey kangaroos, M. fuliginosus, probably behave in ways that expose them to vehicles more than females. Male-biased road-kills of swamp wallabies, Wallabia bicolor, may reflect skewed population sex ratios. There are insufficient data on the behaviour and population structure of the red-necked wallaby, M. rufogriseus, and rufous-bellied pademelon, Thylogale billardierii, to determine which explanation is responsible for male-biased road mortality in these species.
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Herbert, C. A., T. E. Trigg, and D. W. Cooper. "Fertility control in female eastern grey kangaroos using the GnRH agonist deslorelin. 1. Effects on reproduction." Wildlife Research 33, no. 1 (2006): 41. http://dx.doi.org/10.1071/wr04113.
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Eastern grey kangaroos are widespread on the east coast of Australia and frequently reach high densities in reserves and parkland near urban areas. Management of these populations is highly contentious and non-lethal fertility-control technologies are sought as an alternative option to manage population size. This study evaluated the potential of slow-release gonadotrophin-releasing hormone agonist (deslorelin) implants to inhibit reproduction in female kangaroos. Deslorelin treatment effectively inhibited reproduction in adult females for periods of 559 ± 111 days (n = 6) and 651 ± 21 days (n = 5) after administration of one or two 10-mg implants respectively. Animals treated with the lower dosage tended to resume breeding earlier than those that received a total of 20 mg of deslorelin (minimum duration of 18 months). Deslorelin treatment had no effect on blastocyst reactivation in a single treated female and repeat treatment had no negative side-effects. This study has demonstrated that slow-release deslorelin implants can successfully inhibit reproduction for extended periods in the female eastern grey kangaroos. This approach may have potential application in reproductive management of problem kangaroo populations.
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Gardiner, HG. "Dynamics of Perennial Plants in the Mulga (Acacia aneura F. Muell) Zone of Western Australia. I. Rates of Population Change." Rangeland Journal 8, no. 1 (1986): 18. http://dx.doi.org/10.1071/rj9860018.
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The dynamics of populations of six plant species and their responses to environmental factors were examined at Yeelirrie station in the Mulga Zone rangelands of Western Australia. Populations of plants were sampled using sequential maps drawn from low level aerial photographs of areas from which livestock had been removed and which were fenced either to exclude or permit grazing by kangaroos (Macropus rufus Desmarest and Macropus robustus Gould). All six plant species were favoured by the combination of wet years (1973-76) and the removal of livestock from these arid rangelands. Increases ranged from about 20 plants/ha/yr (Eremophila leucophylla, Benth.) to more than 700 plants/ha/yr (Eremophila spectabilis, C.A. Gardn.) during this period. Drought (1977-1979) resulted in significant declines that ranged from about 10 plants/ha/yr (Eremophila leucophylla) to nearly 600 plants/ha/yr (Eremophila spectabilis) while three species (Eremophila leucophylla, Maireana glomerifolia, (F. Muell. et Tate) P.G. Wilson and Ptilotus obovatus, Gaud.) either did not change or increased by only 30 to 60 plants/ha/yr during this period. Responses to kangaroo grazing were strongest during 'normal', post-drought years (1980-82) when Eragrostis xerophila, Domin. decreased by 178 plants/ha/yr on grazed areas while on protected areas there was an increase of 299 plants/ha/yr. This response was due to effects on both recruitment and, as discussed by Gardiner (1986), survival. Maireana glomerifolia, another important plant for livestock was suppressed by kangaroo grazing via reduced recruitment during the 'normal' period. Other species (Frankenia paucifora, DC. and Eremophila spectabilis) responded positively to kangaroo grazing activity during the same period.
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Lavery, Trish J., Ben Roudnew, and James G. Mitchell. "Nitrogen transport from sea to land by a threatened and declining population of Australian sea lions (Neophoca cinerea) on Kangaroo Island, South Australia." Australian Mammalogy 37, no. 1 (2015): 92. http://dx.doi.org/10.1071/am12029.
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Australian sea lions consume prey in highly productive foraging grounds and defaecate nutrients on land. The resident population of 1100 Australian sea lions contributes 3800 (±80) kg N year–1 into Seal Bay Conservation Park, Kangaroo Island, South Australia. If this population were to decline in abundance the nitrogen availability and coastal productivity of Kangaroo Island may be reduced.
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Priddel, D., G. Wellard, and N. Shepherd. "Movements of Sympatric Red Kangaroos, Macropus-Rufus, and Western Grey Kangaroos, Macropus-Fuliginosus, in Western New-South-Wales." Wildlife Research 15, no. 3 (1988): 339. http://dx.doi.org/10.1071/wr9880339.
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Between July 1979 and November 1980 a total of 261 red kangaroos, Macropus rufus, (216F; 45 M) and 170 western grey kangaroos, M. fuliginosus, (136F;34M) were caught and tagged with individually recognisable collars. Between July 1979 and January 1986, 1751 sightings of tagged individuals were recorded. Information gained from these sightings was used to assess how far each kangaroo ranged. More than 90% of individuals of either species did not range far (<9 km for reds; <6 km for western greys) even when local pastures were severely depleted during drought. A few individuals dispersed much further-up to 323 km. On average, red kangaroos ranged further than western greys. Kangaroos on Kinchega National Park ranged no less or no further than those on an adjacent pastoral leasehold. At least 17 tagged individuals crossed the macropod-deterrent fence surrounding Kinchega; several crossed repeatedly. Dispersal of kangaroos from Kinchega was slight, supporting the hypothesis of Bayliss (1985) that dispersal has no significant impact on population dynamics.
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Hone, Jim, and Tony Buckmaster. "How many are there? The use and misuse of continental-scale wildlife abundance estimates." Wildlife Research 41, no. 6 (2014): 473. http://dx.doi.org/10.1071/wr14059.
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The number of individuals in a wildlife population is often estimated and the estimates used for wildlife management. The scientific basis of published continental-scale estimates of individuals in Australia of feral cats and feral pigs is reviewed and contrasted with estimation of red kangaroo abundance and the usage of the estimates. We reviewed all papers on feral cats, feral pigs and red kangaroos found in a Web of Science search and in Australian Wildlife Research and Wildlife Research, and related Australian and overseas scientific and ‘grey’ literature. The estimated number of feral cats in Australia has often been repeated without rigorous evaluation of the origin of the estimate. We propose an origin. The number of feral pigs in Australia was estimated and since then has sometimes been quoted correctly and sometimes misquoted. In contrast, red kangaroo numbers in Australia have been estimated by more rigorous methods and the relevant literature demonstrates active refining and reviewing of estimation procedures and management usage. We propose four criteria for acceptable use of wildlife abundance estimates in wildlife management. The criteria are: use of appropriate statistical or mathematical analysis; precision estimated; original source cited; and age (current or out-of-date) of an estimate evaluated. The criteria are then used here to assess the strength of evidence of the abundance estimates and each has at least one deficiency (being out-of-date). We do know feral cats, feral pigs and red kangaroos occur in Australia but we do not know currently how many feral cats or feral pigs are in Australia. Our knowledge of red kangaroo abundance is stronger at the state than the continental scale, and is also out-of-date at the continental scale. We recommend greater consideration be given to whether abundance estimates at the continental scale are needed and to their use, and not misuse, in wildlife management.
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Cross, Chad L., and Peter M. Waser. "Estimating Population Size in the Banner-Tailed Kangaroo Rat." Southwestern Naturalist 45, no. 2 (June 2000): 176. http://dx.doi.org/10.2307/3672459.
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Croft, DB. "Kangaroo management: individuals and communities." Australian Mammalogy 26, no. 1 (2004): 101. http://dx.doi.org/10.1071/am04101.
Full textAbstract:
Kangaroo management plans for the commercial take of meat and hides and non-commercial population control focus on numbers (estimates of species abundance), proportions (quotas) and trends (sustainability of offtake). Effects on individuals and communities are too readily dismissed leading to inhumane treatment of dependent offspring and single species modelling in a multi-species community. I discuss the evidence for these deficiencies in current management plans and suggest actions and research to redress them.
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McLeod, SR, RB Hacker, and JP Druhan. "Managing the commercial harvest of kangaroos in the Murray-Darling Basin." Australian Mammalogy 26, no. 1 (2004): 9. http://dx.doi.org/10.1071/am04009.
Full textAbstract:
In this study a new, physiologically structured model of kangaroo population dynamics is described. The model has been used to examine a wide range of harvest rate � sex ratio combinations, following a simple harvest strategy where the quota was proportional to population size. The combinations of harvest rate and sex ratio in the harvest that best suited the objectives of the stakeholder groups (non-Government conservationists, wildlife management agencies, the kangaroo industry and pastoralists) were identified using multicriteria decision analysis. The best combinations for the stakeholder groups non-Government conservationists, wildlife management agencies and the kangaroo industry were characterised by a strong male bias (90 ? 100% male) and low to moderate harvest rates (10 ? 40% per annum). The best solutions for pastoralists were female biased (at least 70% females) with high harvest rates (90% per annum).
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Hacker, R. B., K. Sinclair, and L. Pahl. "Prospects for ecologically and socially sustainable management of total grazing pressure in the southern rangelands of Australia." Rangeland Journal 41, no. 6 (2019): 581. http://dx.doi.org/10.1071/rj20006.
Full textAbstract:
Numerous large herbivore species, both native and exotic, share the southern Australian rangelands with domestic livestock, which often account for only about half of the total grazing pressure. Although each presents its individual challenge to landholders, the management of kangaroos is a key component of ecologically sustainable management of the region because (a) they represent a significant component of the non-domestic grazing pressure, particularly in areas from which dingos and wild dogs have been (partially) removed; (b) commercial harvesting, the means of control that has the highest social acceptability, has been rendered ineffective by the actions of activist groups and market closure due to food safety concerns; (c) the task is largely beyond the capacity of individual landholders; and (d) the same constraints do not apply to other non-domestic components of total grazing pressure. Management of total grazing pressure, and particularly kangaroos, currently represents a case of market failure because the level of management that can be expected of landholders is not consistent with public expectations for resource conservation and animal welfare. Several avenues are available by which kangaroo management could be advanced to achieve both public and private benefits. These include adoption of an active, adaptive management approach to the kangaroo population, establishment of arrangements that will shift the general perception of kangaroos from pest to resource, development of an appropriate incentive framework to achieve desirable landscape outcomes, and continued evaluation of the benefits and costs of cluster fencing. These initiatives require both a greater commitment from governments to address the market failure and a proactive stance by industry to engage stakeholders, self-regulate, and objectively demonstrate environmental and animal welfare credentials.
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Coulson, GM, and JA Raines. "Methods for Small-Scale Surveys of Grey Kangaroo Populations." Wildlife Research 12, no. 2 (1985): 119. http://dx.doi.org/10.1071/wr9850119.
Full textAbstract:
Small-scale survey methods which have previously been applied to grey kangaroos were evaluated on a population of known size. The total population size of free-ranging eastern grey kangaroos, Macropus giganteus, on Rotamah Island in the Gippsland Lakes of Victoria was determined by a drive count. Two types of small-scale survey methods were evaluated against this total: line transect counts and faecal pellet counts. The line transect estimates were not significantly different from the known population size, and grey kangaroos appear to meet the critical conditions of the models. Counts of individual faecal pellets gave an acceptable estimate of population density, whereas counts based on pellet groups had significant positive bias.
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Shaughnessy, PD, SD Goldsworthy, and JA Libke. "Changes in the abundance of New Zealand fur seals, Arctocephalus forsteri, on Kangaroo Island, South Australia." Wildlife Research 22, no. 2 (1995): 201. http://dx.doi.org/10.1071/wr9950201.
Full textAbstract:
Kangaroo Island was an important seal-harvesting site during the early years of European colonisation of Australia. A recent survey of the New Zealand fur seal, Arctocephalus forsteri, in South and Western Australia indicates that Kangaroo I. is still an important centre for the species. In order to determine changes in the abundance of the population, numbers of pups were determined at four colonies on Kangaroo Island by mark-recapture in up to five breeding seasons from 1988-89 to 1992-93. Clipping was the preferred technique for mark-recapture estimation of pups because it was quick, easy and effective. Recaptures were conducted visually; they were repeated several times in each season to improve precision of the estimates. No pups were marked between recaptures in order to minimise disturbance. Assumptions made in estimating population size by the mark-recapture technique pertinent to this study are reviewed. Pup numbers increased at three colonies: at Cape Gantheaume, from 458 to 867 over five years (with exponential rate of increase r = 0.16, n = 5); at Nautilus North, from 182 to 376 over five years (at r = 0.19, n = 4); and at North Casuarina Islet, from 442 to 503 over four years (at r = 0.043, n = 2). Rates of increase in the first two colonies are similar to those at the most rapidly increasing fur seal populations in the Southern Hemisphere. The Kangaroo I. population is estimated to be 10000 animals in 1992-93. It is likely to be at the recolonisation phase of growth, with high rates of increase at individual colonies (or parts of colonies) resulting from local immigration. As space does not appear to be limiting expansion in these colonies, fur seal numbers may continue to increase there.
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Sapurtri, Ika Nur, Dwi Handayani, and Maharani Nazmi Nasution. "PENGARUH PERAWATAN METODE KANGURU TERHADAP PENINGKATAN SUHU TUBUH BAYI BERAT LAHIR RENDAH DI NICU RUMAH SAKIT GRANDMED LUBUK PAKAM TAHUN 2018." Jurnal Penelitian Kebidanan & Kespro 1, no. 2 (April 19, 2019): 6–9. http://dx.doi.org/10.36656/jpk2r.v1i2.86.
Full textAbstract:
Babies with low birth weight have a temperature that is unstable and prone to hypothermia (temperature <36,5ºC). Cold stress can increase mortality and hamper growth. The warmth of the mother's body or a known method of kangaroo care proved to be an effective heat source for infants born at term or low birth weight. This study aims to determine whether there is influence kangaroo care method to your body temperature low birth weight infants. This type of research is pre experiment with models (one group pre-post test design). The population of this research is all low birth weight babies. Sampling techniques in use purposive sampling, that the sampling technique was based on sample criteria specified by the researchers themselves. In this case the samples found as many as 22 people. Data analysis using paired sample t-test with a level of 95%. The results of this study gained an average prior to 34.7 kangaroo care method, after doing kangaroo care method 36.9. The mean before and after kangaroo care method 2.2273. Based on the analysis results showed pvalue (0.004) <α (0.05), It can be concluded no treatment effect kangaroo method to your body temperature low birth weight infants. Recommendations from this research is the kangaroo care method can be used as one LBW care that can be done by the mothers in raising and maintaining body temperature.
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Cunningham, Calum X., Thomas A. A. Prowse, Pip Masters, and Phillip Cassey. "Home range, habitat suitability and population modelling of feral Indian peafowl (Pavo cristatus) on Kangaroo Island, South Australia." Australian Journal of Zoology 64, no. 2 (2016): 107. http://dx.doi.org/10.1071/zo15045.
Full textAbstract:
The Indian peafowl (Pavo cristatus) is a declared alien pest species on Kangaroo Island, South Australia, where it is implicated in a range of social problems and potential ecological impacts. To inform the management of feral peafowl, we aimed to (1) provide an estimate of peafowl distribution and abundance; (2) measure peafowl home ranges; (3) calculate the area of suitable peafowl habitat; and (4) estimate how the population could change under various culling scenarios. Using expert and landholder surveys, we estimated that ~380 individuals (range 330–428) were distributed among 21 separate groups on Kangaroo Island. Habitat suitability modelling identified native vegetation near agriculture as the preferred peafowl habitat and indicated that substantial unoccupied suitable habitat is available. The mean home range of eight peafowl was 52 ha and one dispersal event of 4.5 km demonstrated that unoccupied suitable habitat could feasibly be colonised. Demographic models indicated that, if unmanaged, the peafowl population could exceed 2000 individuals after 10 years, but that culling ~85 individuals annually could maintain the current population size. We therefore suggest that control of the Kangaroo Island peafowl population is warranted while the current distribution of peafowl is well understood.
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Shaughnessy, P. D., S. D. Goldsworthy, and A. I. Mackay. "The long-nosed fur seal (Arctocephalus forsteri) in South Australia in 2013–14: abundance, status and trends." Australian Journal of Zoology 63, no. 2 (2015): 101. http://dx.doi.org/10.1071/zo14103.
Full textAbstract:
The long-nosed (or New Zealand) fur seal (Arctocephalus forsteri) breeds in southern Australia and New Zealand. Most of the Australian population is in South Australia, between Kangaroo Island and Eyre Peninsula. Fur seal populations in southern Australia were heavily exploited by colonial sealers between 1801 and 1830, resulting in major reductions. Numbers remained low for 150 years, then slowly built up and new colonies established across their presumed former range. Here we present estimates of pup abundance at South Australia colonies, mostly during the 2013–14 breeding season. Long-nosed fur seals bred from Baudin Rocks in the south-east to Fenelon Island in the north-west. In total, 29 breeding colonies produced 20 431 pups, 3.6 times greater than the 1989–90 estimate; the increase is attributed to recovery from 19th century overharvesting. The 2013–14 pup estimate leads to an estimate of abundance of long-nosed fur seals in South Australia of 97 200. Most pups were on Kangaroo Island (49.6%) and the Neptune Islands (38.6%). New breeding colonies were identified on Williams Island and at two small sites on Kangaroo Island. The increasing trend in South Australia is likely to continue over the coming decade, primarily by expansion in colonies on Kangaroo Island and by establishment of new colonies.
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Saputri, Ika Nur, Dwi Handayani, and Maharani Nazmi Nasution. "Pengaruh Perawatan Metode Kanguru Terhadap Peningkatan Suhu Tubuh Bayi Berat Lahir Rendah di NICU Rumah Sakit GrandMed Lubuk Pakam Tahun 2018." Jurnal Penelitian Kebidanan & Kespro 1, no. 2 (May 2, 2019): 6–9. http://dx.doi.org/10.36656/jpk2r.v1i2.106.
Full textAbstract:
Babies with low birth weight have a temperature that is unstable and prone to hypothermia (temperature <36,5ºC). Cold stress can increase mortality and hamper growth. The warmth of the mother's body or a known method of kangaroo care proved to be an effective heat source for infants born at term or low birth weight. This study aims to determine whether there is influence kangaroo care method to your body temperature low birth weight infants. This type of research is pre experiment with models (one group pre-post test design). The population of this research is all low birth weight babies. Sampling techniques in use purposive sampling, that the sampling technique was based on sample criteria specified by the researchers themselves. In this case the samples found as many as 22 people. Methods of data collection using observation sheets and thermometer measuring instrument. Data analysis using paired sample t-test with a level of 95%. The results of this study gained an average prior to 34.7 kangaroo care method, after doing kangaroo care method 36.9. The mean before and after kangaroo care method 2.2273. Based on the analysis results showed pvalue (0.004) <α (0.05), It can be concluded no treatment effect kangaroo method to your body temperature low birth weight infants. Recommendations from this research is the kangaroo care method can be used as one LBW care that can be done by the mothers in raising and maintaining body temperature.