Academic literature on the topic 'Muttonbird'

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Journal articles on the topic "Muttonbird"

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Zewe, Frances, Paul Meek, Hugh Ford, and Karl Vernes. "A vertical bait station for black rats (Rattus rattus) that reduces bait take by a sympatric native rodent." Australian Mammalogy 36, no. 1 (2014): 67. http://dx.doi.org/10.1071/am13010.

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Novel bait stations can be used as a targeted method of delivering bait by exploiting behavioural traits of the target species. On Muttonbird Island, New South Wales, the black rat (Rattus rattus) has been baited to aid the conservation of the island’s wedge-tailed shearwater (Ardenna pacifica) colony, which may result in poisoning of the sympatric swamp rat (Rattus lutreolus). We aimed to design a bait station that R. rattus could reach, but that R. lutreolus could not. We found that 11 (92%) of 12 captive R. rattus reached the bait chambers by climbing a 50-cm vertical pipe, whereas only four (18%) of 22 R. lutreolus reached these bait stations. In a field trial on Muttonbird Island R. rattus entered the bait chamber on an average of 5.3 events per night of vertical bait station deployment, but R. lutreolus did not enter the stations. In a field trial on the mainland at a site with a high density of R. lutreolus, this species was detected in one vertical bait station five times, equating to an average of 0.017 events per night of vertical bait station deployment. We conclude that R. rattus readily climbs a 50-cm pipe to enter the bait station, whereas R. lutreolus rarely or never does on Muttonbird Island or at the mainland site.
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Rout, Matthew, John Reid, Benjamin Te Aika, Renata Davis, and Te Maire Tau. "Muttonbirding: Loss of executive authority and its impact on entrepreneurship." Journal of Management & Organization 23, no. 6 (November 2017): 857–72. http://dx.doi.org/10.1017/jmo.2017.78.

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AbstractThis paper explores the influence of institutions on indigenous entrepreneurship within the muttonbird economy of Ngāi Tahu (a New Zealand Māori tribe). It determines that colonisation removed the traditional Ngāi Tahu institution of executive authority which once regulated muttonbird exchange. Without this regulatory functionwhānau(family) birders compete against each other at their own expense and to the benefit of traders. As a consequence the birders are constrained in applying their birding knowledge and abilities to realise market opportunity. Furthermore, declining returns and harvesting pressure is in some cases reducing the financial and natural capital ofwhānau, whilst threats to continuing birding culture potentially undermines the socio-human capital contained within inherited traditions and the maintaining of kinship connections. It is argued that the development of a contemporary executive authority to regulate exchange and market product may reinvigorate entrepreneurial birding activities.
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Moller, Henrik, Jane C. Kitson, and Theresa M. Downs. "Knowing by doing: Learning for sustainable muttonbird harvesting." New Zealand Journal of Zoology 36, no. 3 (January 2009): 243–58. http://dx.doi.org/10.1080/03014220909510153.

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Kitson, Jane Catherine. "Harvest rate of sooty shearwaters (Puffinus griseus) by Rakiura Māori: a potential tool to monitor population trends?" Wildlife Research 31, no. 3 (2004): 319. http://dx.doi.org/10.1071/wr02034.

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Sooty shearwaters (tītī, muttonbird, Puffinus griseus) are highly abundant migratory seabirds, which return to breeding colonies in New Zealand. The Rakiura Māori annual chick harvest on islands adjacent to Rakiura (Stewart Island), is one of the last large-scale customary uses of native wildlife in New Zealand. This study aimed to establish whether the rate at which muttonbirders can extract chicks from their breeding burrows indicates population trends of sooty shearwaters. Harvest rates increased slightly with increasing chick densities on Putauhinu Island. Birders' harvest rates vary in their sensitivities to changing chick density. Therefore a monitoring panel requires careful screening to ensure that harvest rates of the birders selected are sensitive to chick density, and represents a cross-section of different islands. Though harvest rates can provide only a general index of population change, it can provide an inexpensive and feasible way to measure population trends. Detecting trends is the first step to assessing the long-term sustainability of the harvest.
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LYVER, P. O'B, and H. MOLLER. "Modern technology and customary use of wildlife: the harvest of Sooty Shearwaters by Rakiura Maori as a case study." Environmental Conservation 26, no. 4 (December 1999): 280–88. http://dx.doi.org/10.1017/s0376892999000405.

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Rakiura Maori (a tribe of indigenous people in New Zealand) continue a centuries-old customary use of Sooty Shearwater (Puffinus griseus, titi, muttonbird) chicks from islands adjacent to Rakiura (Stewart Island). Some muttonbirders pluck chicks by hand, while others have recently changed to a plucking machine. We compared traditional and modern processing methods to see if new technology stands to increase the efficiency, size and cost effectiveness of harvest. On average, chicks were plucked 6 seconds quicker with a machine, which could potentially increase the catch by up to 4%. Innovation by using wax rather than water to remove down left after plucking saved muttonbirders 29–97 minutes per day, potentially allowing up to a 15% increase in the number of chicks harvested. Both wax and plucking machines increased costs, which led to a modest financial gain from using wax, but a net loss from using a plucking machine. Modern technologies have been introduced mainly for convenience and to ease labour in this customary use of wildlife. New technology may erode traditional skills, but does not necessarily pose a risk to the sustainability of a resource. Financial investment in harvest technologies might provide an incentive to increase harvest levels, but could equally provide an incentive to manage for sustainable use. Preservation lobbies are not justified in presuming that new technologies will always threaten wildlife traditionally used by indigenous people.
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Shine, R., and M. Firmage. "Battles for mates and food: Intraspecific combat in island tigersnakes (Notechis ater) from southern Australia." Amphibia-Reptilia 17, no. 1 (1996): 55–65. http://dx.doi.org/10.1163/156853896x00298.

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AbstractMale-male combat occurs in mainland populations of tigersnakes (Notechis scutatus), but authorities have disagreed as to whether or not this behaviour also occurs in island tigersnakes (Notechis ater). In this paper, we confirm that intraspecific combat frequently occurs between island tigersnakes maintained in captivity. Two different kinds of combat bouts were observed. We interpret the first type (ritualised "wrestling" matches between large adult males) as a reflection of sexual competition. This behaviour was seen in snakes from each of the island populations investigated, including Tasmania. Agonistic behaviour was exhibited by females and juveniles as well as by adult males: however, this second type of combat was always initiated by the introduction of food items to the enclosure, and incorporated vigorous biting as well as (or instead of) wrestling. Further observations, in the field as well as in captivity, are needed before we can interpret the functional significance of this behaviour. The food-induced combat may be an artifact of high densities of captive snakes, or alternatively may be exhibited in the wild also. We speculate that the high abundance of tigersnakes on some islands, and the highly clumped nature of prey resources (e.g. muttonbird chicks) in both space and time, may have favoured direct interference competition for prey items between island tigersnakes. If so, some elements of the social system of island tigersnakes may resemble the condition seen in many lizard species, rather than in other snakes.
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Newman, Jamie, David Fletcher, Henrik Moller, Corey Bragg, Darren Scott, and Sam McKechnie. "Estimates of productivity and detection probabilities of breeding attempts in the sooty shearwater (Puffinus griseus), a burrow-nesting petrel." Wildlife Research 36, no. 2 (2009): 159. http://dx.doi.org/10.1071/wr06074.

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Monitoring of breeding success in burrow-nesting seabirds is problematic, owing to the difficulties of detecting occupants in complex burrow systems. We summarise 6 years of monitoring the breeding success of sooty shearwater (tītī, muttonbird, Puffinus griseus) on two southern New Zealand islands, The Snares and Whenua Hou, with a portable infrared camera system. Breeding attempts were monitored three times during the breeding season, i.e. egg laying, hatching and fledging. Overall breeding success was calculated in two stages. First, we estimated breeding success for each island–site–year combination with a model that allowed for imperfect detection of an egg or chick and accounted for the proportion of the breeding season that was covered by monitoring. The resulting estimates for each island were then analysed with a linear model, to provide a single estimate for that island. Breeding success was found to be highly variable and non-synchronous between islands, with the average proportion of eggs successfully fledging on The Snares (0.35, 0.20–0.52; mean and 95% creditable interval) being considerably lower and more variable than that on Whenua Hou (0.76, 0.70–0.82). Probability of detecting a breeding attempt was higher on The Snares whereas correcting for the proportion of the season monitored had a variable effect, reducing The Snares and Whenua Hou estimates by 27% and 7% respectively. The implications of these findings with respect to the demographic modelling of burrow-nesting species are discussed.
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Jones, Chris, Susan Bettany, Henrik Moller, David Fletcher, and Justine de Cruz. "Burrow occupancy and productivity at coastal sooty shearwater (Puffinus griseus) breeding colonies, South Island, New Zealand: can mark - recapture be used to estimate burrowscope accuracy?" Wildlife Research 30, no. 4 (2003): 377. http://dx.doi.org/10.1071/wr01050.

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Breeding colonies of sooty shearwaters ('muttonbird', tïtï, Puffinus griseus) on mainland New Zealand have declined in recent years. New data on burrow occupancy and colony productivity for seven sooty shearwater breeding colonies on the coast of Otago, New Zealand for the 1996–97 and 1997–98 breeding seasons are presented and analysed as part of a five-year data set. Detection of a burrow's occupants using a fibre-optic burrowscope may underestimate absolute occupancy rates, but is still of value in the analysis of trends. Detection probabilities estimated by the novel use of mark–recapture models corresponded with those of previous studies of the technique's accuracy. Mainland declines are associated with a lack of control of introduced mammalian predators at most mainland colonies superimposed on a global pattern of decline in the species' abundance. Large numbers of recovered carcasses and an absence of burrow activity at two small mainland colonies show the decline to extinction of these colonies over the five years of collecting data. At one mainland colony with intensive predator control, survival rates and parameter variances are comparable with those found on a predator-free offshore island. All other mainland colonies showed negligible breeding success. There was a significant positive relationship between egg survival and an index of relative adult survival, with an apparent threshold below which few eggs hatch. Adult survival during the breeding season is likely to be the most important parameter in maintaining a colony's viability.
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Hunter, Christine M., Henrik Moller, and Jane Kitson. "Muttonbirder selectivity of sooty shearwater (titi) chicks harvested in New Zealand." New Zealand Journal of Zoology 27, no. 4 (January 2000): 395–414. http://dx.doi.org/10.1080/03014223.2000.9518249.

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Stevens, Michael J. "An Intimate Knowledge of 'Maori and Mutton-Bird': Big Nana's Story." Journal of New Zealand Studies, no. 14 (July 3, 2013). http://dx.doi.org/10.26686/jnzs.v0i14.1750.

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The institution of mutton-birding is as old as the hill, and from time immemorial it has been the right of the Murihiku natives to gather [titi/muttonbirds]... it is one of the new natural advantages yet entirely in their hands, and they strongly resent the intrusion of pakehas into it.Nga-Ti-Ngaro.Pakehas, married to Natives so privileged, also have a legal right to participate in these [titi harvesting] activities.L.E. Richdale, 1946.
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Dissertations / Theses on the topic "Muttonbird"

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Hunter, Christine M., and n/a. "Demography of Procellariids: model complexity, chick quality, and harvesting." University of Otago. Department of Zoology, 2001. http://adt.otago.ac.nz./public/adt-NZDU20070518.110942.

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Many challenges still exist in the empirical measurement of population size or density of burrow-nesting procellariiforms. Although reasonable precision of burrow occupancy estimates can be achieved with 10-15 transect (20 entrances per transect) per site, unknown levels of bias in burrow occupancy estimates currently prevents reliable estimation of burrow-nesting procellariiform abundance or harvest rates. Because it is unlikely that biases in burrow occupancy are similar among colonies, valid comparisons among sites may require estimates of absolute abundance rather than relative measures of burrow occupancy. The reliability and precision of matrix models for procellariids will depend primarily on the reliability and precision of adult survival estimates. Sensitivities, elasticities and uncertainties of population growth rate to demographic parameters for models with differing structures and parameterisations showed an overwhelming importance of adult survival in determining population growth rate and results of perturbation analyses. Estimates of adult survival should be a primary focus of any procellariid research program involving assessment of population status, or questions of population response to perturbations. Juvenile survival, pre-breeder survival and emigration rates were also shown to be relatively important in determining population growth rate and perturbation analyses. The sensitivity and elasticity of population growth rate to survival rates for all immature stages combined were similar in magnitude to the sensitivity and elasticity of population growth rate to survival rates for fecund birds. Estimation of survival rates for immature birds should also be given high priority in procellariid research programs. The variability in these parameters among populations needs to be assessed if results are to be generalised beyound specific colonies from which parameters are estimated. There is evidence that selective harvest of heavier Titi chicks occurs on at least some islands. However, analyses of a demographic model incorporating different quality chicks showed even extremely high degrees of selective harvest had little influence on population growth rate or perturbation analyses unless overall harvest levels were very high. Comparison of population growth rate and perturbation analyses of models differing in the level of detail in parameterisation or in the number of stages included in the model, showed negligible differences in results. This suggests that simple models, even if based on only sparse data, are adequate to set research priorities and evaluate population response to perturbations such as for the assessment of conservation management options, evaluation of possible causes of population change and assessment of the effects of harvest.
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Clucas, Rosemary, and n/a. "Kia Whakamaramatia Mahi Titi : predictive measures for understanding harvest impacts on Sooty Shearwaters (Puffinus griseus)." University of Otago. Department of Mathematics & Statistics, 2009. http://adt.otago.ac.nz./public/adt-NZDU20090813.140751.

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The sooty shearwater (also known as the muttonbird, Titi, Puffinus griseus) is a long-lived super-abundant, burrow nesting petrel, harvested by Rakiura Maori from breeding colonies, located in southern New Zealand. The harvest is culturally defining and enormously important for Rakiura Maori. The work in this thesis contributes to the Kia Mau te Titi Mo Ake Tonu Atu Research Project being undertaken by Rakiura Maori and the University of Otago, towards assessing ongoing sustainability of the harvest and future threats. Analyses of eight muttonbirder harvest records spanning, 1938 to 2004, show that harvest rates demonstrate, systematic commonalities in seasonal patterns and broad-scale consistency in trends of chick abundance and quality across harvested islands. If co-ordinated and well replicated, harvest records offer Rakiura Maori a low-cost and effective monitoring tool of sooty shearwater reproductive success and long-term population abundance. Hunt tallies provide additional evidence of a dramatic reduction in sooty shearwater abundance from the late 1980s that was also detected by counts from boats off the western seaboard of the USA. A conservative estimate of overall decline in hunt success across diaries, for the period 1972 to 2004, is 1.89 % (CI₉₅ 1.14 to 2.65) per annum, a total reduction of 39.2%. The harvesting records show a sooty shearwater mortality event occurred just prior to the 1993-breeding season at the same time as a severe negative anomaly in both the Pacific Decadal Oscillation and Southern Oscillation Indices. The hunting diaries show a decoupling of chick size with harvest success in the early 1990s. This resulted from a decline in harvest success and an increase in its variability, while chick size remained correlated with changing chick abundance and maintained its pre-1990 average. Long- lived seabirds maintain high survival by skipping breeding and abandoning breeding attempts when oceanic conditions deteriorate, increasing variability in chick abundance is also evidence of pressure on adult survivorship. The multiple diaries confirm these were major demographic events not confined to a single island. My survival estimates for The Snares and Whenua Hou were very high 0.952 (0.896-0.979) compared to earlier estimates for this species. Transience at the colonies is high due to the presence ofjuvenile and pre-breeding birds. Both naturally high survival and the large number of transient pre-breeders indicate sooty shearwater are more resilient to harvest than earlier survival models suggested. There was no evidence for directional change in sooty shearwater breeding phenology over 49-years of harvest. Climate fluctuation/change is therefore apparently not altering egg-laying. Peak fledging occurred fairly consistently in the 2nd of May (IQR = 2.91 days). Yearly variability in emergence occurs primarily due to provisioning and localized fledging conditions. Larger chick size was strongly correlated with delayed fledging and is consistent with the traditional ecological knowledge of the birders. There was no evidence for chicks becoming smaller or that years with starving chicks were more common, so increasing mismatch of breeding with optimal forage was not indicated. The past proportion of birders over the last 20 years (1985 - 2005) has been ~2% all of Rakiura Maori. Approximately 376 birders participated in the 2006 season with an estimated of overall harvest intensity 19.4% (CI₉₅ = 13.8 - 24.2%) and a total catch of 381,000 (CI₉₅ = 262,257 - 487,186) chicks. This study found evidence that catch rates reduced with increasing birder competition partially mitigating effects on harvest pressure. The combined effects of potential climate change on bird abundance and increased harvester competition suggests that the proportion of Rakiura Maori whom choose to bird is likely to decrease as tallies reduce and cost recovery becomes more difficult. Rakiura Maori have for many years cherished and maintained their islands and implemented protective measures to safeguarded titi breeding habitat. Future harvest management will have additional issues to contend with, but Rakiura Maori are necessarily confronting these issues as the titi culture rests on the maintenance of their taonga. The information presented in this thesis shows that combining science and traditional knowledge is a powerful tool for managing harvest sustainability.
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