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Taryannikov V.I. |
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Distribution, biology, and current population status of rare predatory mammals in the Western Hissar |
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Miscellaneous |
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1986 |
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107-109 |
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Uzbekistan; Western Hissar ridge; distribution; number; diet; rare species; decline; poaching; Lynx; otter; ibex; snow leopard.; 8380; Russian |
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Described are distribution, biotopical distribution, food, and some biological features of Uncia uncia, Felis lynx, Lutra lutra. New finds of Lutra lutra were observed at the Kashkadarya river. All the species' populations were counted and the reasons for their decrease given. In the author's opinion, number of snow leopard is decreasing as number of Siberian ibex is decreasing too and snow leopard is being poached for. There are 10-12 snow leopards on the slopes of the Hissar ridge. |
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Full text available in Russian |
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SLN @ rana @ 816 |
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957 |
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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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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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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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