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Author |
Ale, S.; Brown, J. |
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Title |
The contingencies of group size and vigilance |
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Miscellaneous |
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Year |
2007 |
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Evolutionary Ecology Research, |
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9 |
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1263-1276 |
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attraction effect,contingency,dilution effect,fitness,group-size effect,many-eyes effect,predation risk,vigilance behaviour; predation; decline; potential; predators; predator; feeding; Animals; Animal; use; food; effects; Relationship; behaviour; methods; game; Interactions; interaction; factor; value; Energy |
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Abstract |
Background: Predation risk declines non-linearly with one's own vigilance and the vigilance of others in the group (the 'many-eyes' effect). Furthermore, as group size increases, the individual's risk of predation may decline through dilution with more potential victims, but may increase if larger groups attract more predators. These are known, respectively, as the dilution effect and the attraction effect.
Assumptions: Feeding animals use vigilance to trade-off food and safety. Net feeding rate declines linearly with vigilance.
Question: How do the many-eyes, dilution, and attraction effects interact to influence the relationship between group size and vigilance behaviour?
Mathematical methods: We use game theory and the fitness-generating function to determine the ESS level of vigilance of an individual within a group.
Predictions: Vigilance decreases with group size as a consequence of the many-eyes and dilution effects but increases with group size as a consequence of the attraction effect, when they act independent of each other. Their synergetic effects on vigilance depend upon the relative strengths of each and their interactions. Regardless, the influence of other factors on vigilance – such as encounter rate with predators, predator lethality, marginal value of energy, and value of vigilance – decline with group size. |
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SLN @ rana @ 886 |
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53 |
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Author |
Brunstein, L. |
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Title |
Handrearing Snow Leopards in the Cheyenne Mountain Zoo |
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Journal Article |
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1978 |
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Int.Ped.Book of Snow Leopards |
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1 |
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44-49 |
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hand-rearing; hand; rearing; cubs; bottle; feeding; diet; browse; 3580 |
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SLN @ rana @ 43 |
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200 |
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Author |
Fox, J.L.; Chundawat, R.S. |
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Title |
Observations of snow leopard stalking, killing and feeding behavior |
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Journal Article |
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Year |
1988 |
Publication |
Mammalia |
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52 |
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1 |
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137-140 |
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Keywords |
India; stalking; killing; feeding; behavior; observations; browse; 850 |
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Full Text at URLDocument Type: English |
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SLN @ rana @ 99 |
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292 |
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Author |
Hongguang, H.; Yongfu, X. |
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Title |
Captive snow leopards in the Chongqing Zoo |
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Conference Article |
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1994 |
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191-193 |
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China; zoos; captivity; cage; food; feeding; diet; management; zoo; browse; 3390 |
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Islt |
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Usa |
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J.L.Fox; D.Jizeng |
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Full Text at URLTitle, Monographic: Seventh International Snow Leopard SymposiumPlace of Meeting: ChinaDate of Copyright: 1994 |
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SLN @ rana @ 228 |
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389 |
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Author |
Lilin, Z. |
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Title |
Captive rearing of a wild snow leopard cub in the Xining Zoo, China |
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Conference Article |
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1994 |
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177-182 |
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zoos; captivity; zoo; husbandry; rearing; distribution; diet; food; feeding; young; cubs; reproduction; breeding; mating; China; browse; 3700 |
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Islt |
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Usa |
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J.L.Fox; D.Jizeng |
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Full text at URLTitle, Monographic: Seventh International Snow Leopard SymposiumPlace of Meeting: ChinaDate of Copyright: 1994 |
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no |
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Call Number |
SLN @ rana @ 245 |
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619 |
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Author |
Xinchun, M. |
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Title |
Distribution in the wild and the captive raising of snow leopards in Xinjiang, China |
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Conference Article |
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Year |
1994 |
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157-162 |
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distribution; habitat; ibex; blue-sheep; argali; hides; skins; pelts; furs; coats; zoos; zoo; China; captivity; care; husbandry; feeding; diet; housing; Disease; blue; sheep; browse; 3770 |
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Islt |
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Usa |
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J.L.Fox; D.Jizeng |
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Full text at URLTitle, Monographic: Seventh International Snow Leopard SymposiumPlace of Meeting: ChinaDate of Copyright: 1994 |
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Call Number |
SLN @ rana @ 267 |
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1031 |
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Author |
Seidensticker, J.; Lumpkin, S. |
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Title |
The adaptable leopard; unfortunately it's no match for modern man |
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Journal Article |
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1996 |
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Wildlife Conservation |
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99 |
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3 |
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52 |
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predator; prey; poaching; hunting; behavior; feeding; conflict; habitat; browse; 1130 |
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Abstract: Leopards' adaptability has become the species' vulnerability. The animals do not hesitate to eat rotting flesh and will come back repeatedly to their meal, if disturbed. People have taken advantage of this by lacing carcasses with poison. Leopards are moderate in size compared to other cats, are stealthy and can live in areas as diverse as rain forests and deserts. |
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Document Type: English |
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SLN @ rana @ 291 |
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876 |
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Author |
Lu, Q., Xiao, L., Cheng, C., Lu, Z., Zhao, J., Yao, M. |
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Title |
Snow Leopard Dietary Preferences and Livestock Predation Revealed by Fecal DNA Metabarcoding: No Evidence for Apparent Competition Between Wild and Domestic Prey |
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Journal Article |
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2021 |
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Frontiers in Ecology and Evolution |
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9 |
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783546 |
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1 - 14 |
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apparent mutualism, blue sheep, feeding habits, molecular dietary analysis, human-carnivore conflict, prey selection, Sanjiangyuan |
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Accurate assessments of the patterns and drivers of livestock depredation by wild carnivores are vital for designing effective mitigation strategies to reduce human-wildlife conflict. Snow leopard’s (Panthera uncia) range extensively overlaps pastoralist land- use and livestock predation there is widely reported, but the ecological determinants of livestock consumption by snow leopards remain obscure. We investigated snow leopard dietary habits at seven sites across the Sanjiangyuan region of the Qinghai– Tibetan Plateau (QTP), an area central to the species’ global range. Snow leopard abundance, wild prey composition, and livestock density varied among those sites, thus allowing us to test the effects of various factors on snow leopard diet and livestock predation. Using DNA metabarcoding, we obtained highly resolved dietary data from 351 genetically verified snow leopard fecal samples. We then analyzed the prey preferences of snow leopards and examined ecological factors related to their livestock consumption. Across the sites, snow leopard prey was composed mainly of wild ungulates (mean = 81.5% of dietary sequences), particularly bharal (Pseudois nayaur), and supplemented with livestock (7.62%) and smaller mammals (marmots, pikas, mice; 10.7%). Snow leopards showed a strong preference for bharal, relative to livestock, based on their densities. Interestingly, both proportional and total livestock consumption by snow leopards increased linearly with local livestock biomass, but not with livestock density. That, together with a slight negative relationship with bharal density, supports apparent facilitation between wild and domestic prey. We also found a significant positive correlation between population densities of snow leopard and bharal, yet those densities showed slight negative relationships with livestock density. Our results highlight the importance of sufficient wild ungulate abundance to the conservation of viable snow leopard populations. Additionally, livestock protection is critically needed to reduce losses to snow leopard depredation, especially where local livestock abundances are high. |
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SLN @ rakhee @ |
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1675 |
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Author |
Christiansen, P. |
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Title |
Canine morphology in the larger Felidae: implications for feeding ecology |
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Journal Article |
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2007 |
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Biological Journal of the Linnean Society |
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91 |
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573-592 |
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bite force, canine, clouded leopard, feeding behaviour, felid, Homotherium serum, leopard, Megantereoncultridens, morphology, Neofelis nebulosa, paleontology, Panthera pardus, Panthera tigris, puma, Puma concolor, Smilodon fatalis, Smilodon populator, snow leopard, Uncia uncia |
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Canine morphology is analysed at seven intervals along the crown in both
anteroposterior and lateromedial perspective in seven species of large felids. The puma and the snow leopard have stout, rather conical canines, whereas those of lions, jaguars, and tigers bear substantial resemblance to each other, reflecting their phylogenetic relationships, and are less conical and large. The canines of the leopard are intermediate in morphology between those of the other species, probably reflecting its more generalized diet. The clouded leopard has very large and blade-like canines, which are different from the other analysed species. Canine bending strengths to estimated bite forces appear to differ less among the species than morphology,indicating that the evolution of canines has been constricted with respect to their strength in failure, probably owing to their being equally important for species fitness. However, the clouded leopard again stands out, having a high estimated bite force and rather weak canines in bending about the anteroposterior as well as lateromedial planes compared to the other species. Canine morphology to some extent reflects differences in killing mode, but also appears to be related to the phylogeny. The marked divergence of the clouded leopard is presently not understood. |
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SLN @ rana @ |
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1115 |
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Author |
Shrestha, R.; Wegge, P. |
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Title |
Determining the composition of herbivore diets in the Trans-Himalayan rangelands: A comparison of field methods |
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Journal Article |
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2006 |
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Journal of Rangeland Ecology and Management |
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59 |
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5 |
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512-518 |
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bite count; Bos grunniens; Capra hircus; diet; fecal analysis; feeding site examination; food habits; free ranging; Nepal; Ovis aries; trans-himalayan |
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In late summer, in a semi-arid mountain range in Nepal, we compared 3 field methods for determining the botanical composition of herbivore diets. Data were collected from the same animals belonging to 1 herd of domestic yak (Bos grunniens) and 2 herds of mixed smallstock, consisting of domestic goats (Capra hircus) and sheep (Ovis aries). Bite count, feeding site examination, and microhistological analysis of feces gave different estimates of forage categories and plant species in both animal groups. Because yaks grazed in other vegetation communities when not observed for bite-counts and feeding signs, the results from the latter methods could not be compared directly with that from fecal analysis. In smallstock, feeding site examination gave higher estimates of graminoids and lower estimates of shrubs than the other 2 methods, probably because all feeding signs on shrubs were not detected. Bite-counts and fecal analysis gave comparable results, except that forbs were underestimated by fecal analysis, presumably due to their more complete digestion. Owing to the difficulty in collecting samples that are representative of the entire grazing period and the problem of recording feeding signs correctly, both feeding site examination and bite-counts are unsuitable methods for studying the food habits of free ranging domestic and wild herbivores. Microhistological analysis of feces appears to be the most appropriate method, but correction factors are needed to adjust for differential digestion. The systematic use of photomicrographs improves the speed and accuracy of the fecal analysis. |
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SLN @ rana @ 935 |
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889 |
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