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Artykuły w czasopismach na temat „Chelodina longicollis Ecology”

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Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 7 lutego 2022

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Chessman, BC. "Seasonal and Diel Activity of Fresh-Water Turtles in the Murray Valley, Victoria and New South-Wales". Wildlife Research 15, nr 3 (1988): 267. http://dx.doi.org/10.1071/wr9880267.

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Activity cycles of Chelodina expansa, C. longicollis and Emydura macquarii were inferred from captures in baited traps set in the Murray River and Lake Boga. C. expansa and E, macquarii were caught only from October to April, while C. longicollis was taken in all months but June and July. Minimum water temperatures at capture were highest for C. expansa and lowest for C. longicollis. Diel cycles of catch rate were often weak, but tended to be bimodal for all species, with peaks near dawn and in the afternoon or evening. Unlike the Chelodina species, E. macquarii was ofen caught near midnight. In the laboratory (at c.24�C with light:dark 12:12 h), the average diel pattern of locomotor activity was weakly bimodal in C. expansa, strongly bimodal in C. longicollis and unimodal in E. macquarii.

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Chessman, BC. "Habitat Preferences of Fresh-Water Turtles in the Murray Valley, Victoria and New-South-Wales". Wildlife Research 15, nr 5 (1988): 485. http://dx.doi.org/10.1071/wr9880485.

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Preferences of Chelodina expansa, Chelodina longicollis and Emydura macquarii (Testudines : Chelidae) for different types of aquatic habitat on the Murray River flood plain in south-eastern Australia were inferred from catch statistics. E. macquarii was the species most often caught in the river itself and river backwaters, whereas C. longicollis formed the majority of captures from oxbow lakes, anabranches, ponds, rain pools and a swamp. Relative abundance of E. macquarii was significantly positively correlated with water body depth, transparency, persistence during dry conditions and flow speed, and negatively correlated with remoteness from the river. C. longicollis demonstrated the opposite pattern, and the proportional catch of C. expansa was weakly correlated with environmental variables. The capacity of C. longicollis for colonising and surviving in small, remote and ephemeral ponds and pools relates to its ability to aestivate and resist desiccation and its propensity for overland migration.

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Georges, a., RH Norris i L. Wensing. "Diet of the Fresh-Water Turtle Chelodina-Longicollis (Testudines, Chelidae) From the Coastal Dune Lakes of the Jervis Bay Territory". Wildlife Research 13, nr 2 (1986): 301. http://dx.doi.org/10.1071/wr9860301.

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Chelodina longicollis is an opportunistic carnivore that obtains its food from a wide variety of sourcesplankton, nekton, benthic macro-organisms, carrion, and terrestrial organisms that fall upon the water. Although there are some quantitative differences between the littoral components of the diet and the composition of the littoral fauna, these can be attributed to differences in accessibility or 'noticeability' among prey species. There is no evidence to suggest that C, longicollis is selective in what it eats, within the confines of carnivory. Comparison of the diet of C. longicollis with those of other sympatric chelids reveals considerable overlap; the relevance of this to geographic variation in abundance of the species is discussed.

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Chessman, Bruce C. "Effects of temperature and exercise on metabolism of three species of Australian freshwater turtles: implications for responses to climate change". Australian Journal of Zoology 66, nr 6 (2018): 317. http://dx.doi.org/10.1071/zo18062.

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Oxygen consumption () of Chelodina expansa, C. longicollis and Emydura macquarii (Pleurodira: Chelidae) was measured at rest and during induced exercise at 8, 13, 18, 22, 26, 30 and 34°C. Resting varied significantly among species, being lowest in C. expansa, which is the most sedentary of the three species in nature, and highest in E. macquarii, which is the most energetic, but active did not differ significantly among the three species overall. For both Chelodina species, resting was appreciably lower than expected from regression of on body mass for non-marine turtles globally, a result that reinforces previous evidence of low resting metabolism in Australian chelid turtles. Active of all three species at higher temperatures was similar to reported for active freshwater cryptodires. Resting of all three species increased similarly with temperature, but active and aerobic scope did not. In C. expansa and E. macquarii, active and aerobic scope increased over the full temperature range assessed but in C. longicollis these variables reached a plateau above 22°C. Projected increases in freshwater temperatures in south-eastern Australia as a result of global warming are likely to enhance activity, feeding and growth of the three species (subject to food availability), especially in cooler seasons for C. longicollis and warmer seasons for C. expansa and E. macquarii. However, other aspects of predicted climate change, especially increased drought, are likely to be detrimental.

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Chessman, Bruce C. "Behavioural thermoregulation by Australian freshwater turtles: interspecific differences and implications for responses to climate change". Australian Journal of Zoology 67, nr 2 (2019): 94. http://dx.doi.org/10.1071/zo20004.

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The abilities of freshwater turtles to control their body temperatures by behavioural means have implications for activity, food ingestion and digestion, growth, reproduction and potential responses to climate change. I compared various forms of basking in nature, and responses to aquatic and aerial photothermal gradients in the laboratory, among three species of Australian chelid turtles: Chelodina expansa, C. longicollis and Emydura macquarii. Proclivity for behavioural thermoregulation varied substantially among these species, being highest in C. longicollis and lowest in C. expansa. However, C. expansa had a thermophilic response to feeding. For C. longicollis and E. macquarii, behavioural thermoregulation may enhance colonisation of more southerly latitudes or higher elevations as climatic warming proceeds. However, increasing air temperatures may pose a hazard to turtles dispersing or sheltering terrestrially (for example, when water bodies dry during drought). C. longicollis appears the best placed of the three species to avoid this hazard through its abilities to thermoregulate behaviourally and to aestivate in terrestrial microenvironments that are buffered against temperature extremes.

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Palmer-Allen, M., F. Beynon i a. Georges. "Hatchling Sex Ratios are Independent of Temperature in Field Nests of the Long-necked Turtle, Chelodina longicollis (Testudinata : Chelidae)". Wildlife Research 18, nr 2 (1991): 225. http://dx.doi.org/10.1071/wr9910225.

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Eastern long-necked turtles, Chelodina longicollis, are known to lack heteromorphic sex chromosomes and to lack temperature-dependent sex determination when incubated under constant conditions. This study determined whether sex ratios of hatchlings emerging from natural nests of C. longicollis were different from that expected from constant temperature experiments. Temperatures in the eight nests monitored varied considerably each day (by 1.7-12.6�C), with eggs at the top of the nest experiencing the greatest variation (mean range 9.0�C) and eggs at the bottom experiencing least variation (mean range 5.3�C). Temperatures experienced by the top and bottom eggs differed by as much as 5.7�C at any one time. No monotonic seasonal trend was evident, but rainfall caused a sharp drop in nest temperatures. Sex ratios in hatchlings from 14 field nests of C. longicollis did not differ significantly from 1:1, a result in agreement with previous studies conducted at constant incubation temperatures in the laboratory.

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Graham, Terry, Arthur Georges i Neil McElhinney. "Terrestrial Orientation by the Eastern Long-Necked Turtle, Chelodina longicollis, from Australia". Journal of Herpetology 30, nr 4 (grudzień 1996): 467. http://dx.doi.org/10.2307/1565689.

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Stokeld, Danielle, Andrew J. Hamer, Rodney van der Ree, Vincent Pettigrove i Graeme Gillespie. "Factors influencing occurrence of a freshwater turtle in an urban landscape: a resilient species?" Wildlife Research 41, nr 2 (2014): 163. http://dx.doi.org/10.1071/wr13205.

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Context Species vary broadly in their ability to adapt to urbanisation. Freshwater turtles are vulnerable to the loss and degradation of terrestrial and aquatic habitat in urban environments. There have been few publications investigating impacts of urbanisation on freshwater turtles in Australia. Aims We investigated the effects of urbanisation on the distribution and abundance of the eastern long-necked turtle (Chelodina longicollis) in greater Melbourne. Methods We examined occurrence and relative abundance of C. longicollis at 55 wetlands across an urban–rural gradient in relation to site- and landscape-level factors. Occupancy was modelled using the program PRESENCE, and incorporated landscape and habitat covariates. A negative binomial regression model was used to examine the influence of landscape and habitat factors on relative abundance by using WinBUGS. Key results C. longicollis occupied 85% of the 55 wetlands we surveyed, and we found no evidence that wetland occupancy was influenced by the variables we measured. However, relative abundance was highest at wetlands with low water conductivity and heavy metal pollution, and in wetlands furthest from rivers. Conclusions C. longicollis appears to be resilient to urbanisation and is likely to persist in urban landscapes, possibly because of the creation of new wetlands in Australian cities. However, long-term studies focussed on demographic parameters, or survivorship, may elucidate as yet undetected effects of urbanisation. Although no specific management recommendations may be necessary for C. longicollis in urban areas at this time, this species may be in decline in non-urban areas as a result of climatic changes and wetland drying. Implications Our findings suggest that caution is required before drawing generalised conclusions on the impacts of urbanisation on turtles, as the effects are likely to be species-specific, dependent on specific ecology and life-history requirements. Further studies are required to ascertain these relationships for a wider array of species and over longer time spans.

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Doody, J. Sean, John Roe, Phillip Mayes i Lesley Ishiyama. "Telemetry tagging methods for some freshwater reptiles". Marine and Freshwater Research 60, nr 4 (2009): 293. http://dx.doi.org/10.1071/mf08158.

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Reptiles are often ignored or under-studied in freshwater systems. An understanding of their biology and thus their role in aquatic communities can be greatly advanced by studies using radio telemetry. In turn, the value of radio telemetry for research depends on the availability of suitable and reliable methods of attaching or implanting radio transmitters. The present study describes transmitter attachment and implantation techniques for selected freshwater reptiles, including the eastern and northern long-necked turtles (Chelodina longicollis and Chelodina rugosa, respectively), the pig-nosed turtle (Carettochelys insculpta), Mertens’ water monitor (Varanus mertensi) and the water dragon (Physignathus lesueurii). The effectiveness of the methods for each species is described and the potential pitfalls and challenges of each method are discussed. The literature abounds with techniques for attachment and implantation techniques, and the methods used in the present study are not wholly novel. The aim, however, is to provide detailed summaries, in one paper, of effective methods for attachment and implantation of radio-tags for freshwater reptiles with a diversity of sizes, shapes and attachment surfaces. Despite the focus on Australian freshwater reptiles, these methods are applicable to aquatic reptiles worldwide.

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Georges, Arthur. "Sex Determination Is Independent of Incubation Temperature in Another Chelid Turtle, Chelodina longicollis". Copeia 1988, nr 1 (5.02.1988): 248. http://dx.doi.org/10.2307/1445946.

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Zhang, Xiuwen, i Arthur Georges. "A complete mitochondrial genome sequence for the Australian turtle, Chelodina longicollis, obtained using 454-pyrosequencing". Conservation Genetics Resources 6, nr 3 (19.04.2014): 555–57. http://dx.doi.org/10.1007/s12686-014-0202-z.

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Kennett, R., A. Georges i M. Palmerallen. "Early Developmental Arrest During Immersion of Eggs of a Tropical Fresh-Water Turtle, Chelodina-Rugosa (Testudinata, Chelidae), From Northern Australia". Australian Journal of Zoology 41, nr 1 (1993): 37. http://dx.doi.org/10.1071/zo9930037.

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Freshly laid. eggs of Chelodina rugosa survived for up to 12 weeks when immersed in water and subsequently underwent successful incubation and normal hatching. Embryonic development was arrested during immersion, remained arrested in an atmosphere of nitrogen, and recommenced when eggs were exposed to air. The hypoxic conditions during immersion appear to extend the arrest typical of turtle embryos during their period in the oviducts. Freshly laid eggs of the temperate-zone C. longicollis died when immersed for longer than one week and eggs of both species died when immersed after post-laying embryonic development had commenced. These results, supported by anecdoctal and experimental evidence, suggest that C. rugosa lays its eggs in saturated or flooded ground in the late wet or early dry monsoonal season. Embryonic development presumably remains arrested until water levels drop and oxygen tensions in the nest rise by diffusion through the drying soil. Partly developed embryos in nests that are flooded after laying would perish. In contrast, C. longicollis of temperate Australia nests only in relatively dry substrates, and its eggs appear not be have evolved the capacity to withstand immersion.

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Stott, P. "Terrestrial Movements of the Fresh-Water Tortoise Chelodina-Longicollis Shaw as Monitored With a Spool Tracking Device". Wildlife Research 14, nr 4 (1987): 559. http://dx.doi.org/10.1071/wr9870559.

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The freshwater tortoise Chelodina longicoflis is often found travelling over land, but no detailed information about these movements has been recorded. In this study 30 spool-and-line tracking devices were used to trace the movements of individual animals. The tracking devices were cheap, readily made, reliable, and gave precise tracings. The tortoises exhibited three types of movement: pond-to-pond, nesting, and movement involving the use of refuges. Many of the tracings were remarkably straight, indicating navigational capacity. Journeys of several hundred metres were frequently made overnight, and movements occasionally were prompted by rainfall.

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ROE, JOHN H., i ARTHUR GEORGES. "Terrestrial activity, movements and spatial ecology of an Australian freshwater turtle, Chelodina longicollis, in a temporally dynamic wetland system". Austral Ecology 33, nr 8 (30.10.2008): 1045–56. http://dx.doi.org/10.1111/j.1442-9993.2008.01877.x.

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Bower, Deborah S., Clare E. Death i Arthur Georges. "Ecological and physiological impacts of salinisation on freshwater turtles of the lower Murray River". Wildlife Research 39, nr 8 (2012): 705. http://dx.doi.org/10.1071/wr11214.

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Context The increasing intensity and extent of anthropogenically mediated salinisation in freshwater systems has the potential to affect freshwater species through physiological and ecological processes. Determining responses to salinisation is critical to predicting impacts on fauna. Aims We aimed to quantify the response of wild-caught turtles from freshwater lakes that had become saline in the lower Murray River catchment. Methods Plasma electrolytes of all three species of freshwater turtle from South Australia were compared among two freshwater sites (Horseshoe Lagoon and Swan Reach), a brackish lake (Lake Bonney) and a saline lake (Lake Alexandrina). Key results Chelodina longicollis, C. expansa and Emydura macquarii from a brackish lake had higher concentrations of plasma sodium and chloride than those from freshwater habitats. However, osmolytes known to increase under severe osmotic stress (urea and uric acid) were not elevated in brackish sites. Turtles from the highly saline lake were colonised by an invasive marine worm which encased the carapace and inhibited limb movement. Conclusions Freshwater turtles in brackish backwaters had little response to salinity, whereas the C. longicollis in a saline lake had a significant physiological response caused by salt and further impacts from colonisation of marine worms. Implications Short periods of high salinity are unlikely to adversely affect freshwater turtles. However, secondary ecological processes, such as immobilisation from a marine worm may cause unexpected impacts on freshwater fauna.

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Robley, Alan, Katie Howard, Michael Lindeman, Rhet Cameron, Andrew Jardine i David Hiscock. "The effectiveness of short-term fox control in protecting a seasonally vulnerable species, the Eastern Long-necked Turtle (Chelodina longicollis)". Ecological Management & Restoration 17, nr 1 (styczeń 2016): 63–69. http://dx.doi.org/10.1111/emr.12199.

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