Grouping of Eastern Grey Kangaroos in Open Habitat

Heathcote, C. A.

doi:10.1071/wr9870343

Cited by 33 publications

(28 citation statements)

References 16 publications

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“…Macropus eugenii I ( Blumstein et al .2004) Macropus eugenii* I ( Blumstein et al 2004) Macropus eugenii I Macropus eugenii* C, I ( Blumstein et al 1999) Macropus rufogriseus M ( Coulson 1999) Macropus rufogriseus M ( Payne & Jarman 1999) Macropus rufogriseus I Macropus rufogriseus* I Macropus agilis M Macropus fuliginosus M Macropus fuliginosus M ( Coulson 1999) Macropus fuliginosus I Macropus giganteus M ( Payne & Jarman 1999) Macropus giganteus M ( Heathcote 1987) Macropus giganteus M ( Colagross & Cockburn 1993) …”

Section: Macropus Eugenii M ( Blumstein and Daniel 2002)unclassified

“…We then scored a species as having group size effects if there was a significant regression between group size and time allocation or, for less social species, only found alone or in groups of two, whether there was a significant difference in time allocation when alone or in a group. In addition to these systematically collected data (see electronic appendix 1), we included data on the presence or absence of group size effects reported in the literature (Heathcote 1987;Jarman 1987;Johnson 1987;Colagross & Cockburn 1993;Coulson 1999;Payne & Jarman 1999Wahungu et al 2001. Because time allocated to foraging may be influenced by body size, we compiled the mean female body size for each species from Strahan (1995).…”

Section: Methodsmentioning

confidence: 99%

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The loss of anti-predator behaviour following isolation on islands

Blumstein¹,

Daniel²

2005

Proc. R. Soc. B.

248

220

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When isolated from predators, costly and no longer functional anti-predator behaviour should be selected against. Predator naiveté is often pronounced on islands, where species are found with few or no predators. However, isolation on islands involves other processes, such as founder effects, that might be responsible for naiveté or reduced anti-predator behaviour. We report the first comparative evidence that, in macropodid marsupials, isolation on islands may lead to a systematic loss of 'group size effects'-a behaviour whereby individuals reduce anti-predator vigilance and allocate more time to foraging as group size increases. Moreover, insular animals forage more, and are less vigilant, than mainland ones. However, we found no evidence that animals on the mainland are 'flightier' than those on islands. Remarkably, we also found no evidence that isolation from all predators per se is responsible for these effects. Together, these results demonstrate that anti-predator behaviour may indeed be lost or modified when animals are isolated on islands, but it is premature to assume that all such behaviour is affected.

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Section: Macropus Eugenii M ( Blumstein and Daniel 2002)unclassified

Section: Methodsmentioning

confidence: 99%

The loss of anti-predator behaviour following isolation on islands

Blumstein¹,

Daniel²

2005

Proc. R. Soc. B.

248

220

View full text Add to dashboard Cite

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“…Apart from the likelihood that the disturbance would have displaced kangaroos from open habitat at their farm site, at least in the short term, the culling of every individual M. giganteus without a radio‐collar (approximately 180 individuals) during the study is certain to have influenced the subsequent ranging behaviour of their study individuals ( n = 5). Macropus giganteus relies on grouping as an antipredator strategy, forming larger groups when feeding in the open (Heathcote 1987), which allows individuals to allocate more time to foraging and less to vigilance (Jarman 1987; Colagross & Cockburn 1993; Coulson 1999). The observation by Viggers & Hearn that individuals rarely moved beyond the woodland margins of their farm site was hardly surprising, given how few were available to form groups for efficient exploitation of open habitat.…”

Section: Home Range Estimatesmentioning

confidence: 99%

The Viggers & Hearn conundrum: a kangaroo home range study with no implications for land management

Martin

Coulson

Stefano

et al. 2007

Journal of Applied Ecology

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Summary1. Viggers & Hearn (2005) examined the encroachment of native herbivores on to farmland. They presented kangaroo home range estimates and pasture biomass data for three sites in south-eastern Australia, then made broad management recommendations regarding the preservation of remnant habitat. 2. While Viggers & Hearn identified potentially important patterns, we believe that their data were neither sufficient nor appropriate to reveal the processes that underlie these patterns. 3. Specifically, their study was unreplicated at the land-use level, used inappropriate density estimates for their study populations, failed to measure resources adequately, used flawed methods of home range analysis, and demonstrated limited understanding of key concepts and of their study species and thus could not draw valid conclusions.

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“…In contrast, smaller body‐sized macropodids may have evolved group size effects and related antipredator behavior in response to predation by the smaller marsupial carnivores. A recent origin of group size effects may also account for population‐specific results where some studies have documented group size effects in a species (Heathcote 1987, Jarman 1987, Coulson 1999, Payne and Jarman 1999), while other studies have not (Johnson 1989, Colagross and Cockburn 1993).…”

Section: Discussionmentioning

confidence: 99%

Foraging behavior of three Tasmanian macropodid marsupials in response to present and historical predation threat

Blumstein

Daniel²

2003

Ecography

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It is often essential to understand historical selection regimes to explain current traits. We studied antipredator behavior of three Tasmanian macropodid marsupials – Forester kangaroos Macropus giganteus, Bennett's wallabies M. rufogriseus, and Tasmanian pademelons Thylogale billardierii– to understand how antipredator behavior functions in a relatively intact predator community. We also compared behavior of the kangaroos and wallabies on a predator‐free island where they were translocated from mainland Tasmania 30 yr ago. Both species allowed humans to get closer to them on the predator‐free island; a finding consistent with a reduced risk of predation on the island. Neither kangaroos, nor wallabies, exhibited group size effects – they did not modify time allocated to foraging or antipredator vigilance as a function of group size at either site. Nor did overall time allocation vary in any consistent way. In contrast, mainland Australian sibling‐species of Forester kangaroos and Bennett's wallabies have both been reported to have group size effects. It is possible either that the extinction of the thylacine Thylacinus cynocephalus in the last century has led to an evolutionary loss of group size effects and other antipredator behavior, or that thylacines were never that important a predator on Tasmanian subspecies. In contrast, Tasmanian pademelons studied on the Tasmanian mainland modified time allocation as a function of group size suggesting that they perceived safety in numbers. Pademelons, because of their body size, are relatively more vulnerable than larger‐bodied macropodids to the rich community of marsupial carnivores in Tasmania, and used a mix of social and individual strategies to manage predation risk.

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Grouping of Eastern Grey Kangaroos in Open Habitat

Cited by 33 publications

References 16 publications

The loss of anti-predator behaviour following isolation on islands

The loss of anti-predator behaviour following isolation on islands

The Viggers & Hearn conundrum: a kangaroo home range study with no implications for land management

Foraging behavior of three Tasmanian macropodid marsupials in response to present and historical predation threat

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