Foraging costs and accessibility as determinants of giving-up densities in a swan-pondweed system

Article Abstract:

The swan's attack rates, the foraging costs and giving up densities (GUDs) in natural and experimental food patches are compared in natural and experimental food patches that differ in water depth and unlike most studies that attribute habitat specific differences in GUDs to predation risk, food quality or forging substrate. The agreement between calculated and observed maximum accessible foraging depths suggests that accessibility largely explains the remaining difference in GUDs with depth, and it confirms the existence of partial prey refuges in the system.

Food and nutrition, Swans

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Public information and patch estimation for group foragers: A re-evaluation of patch quitting strategies in a patchy environment

Article Abstract:

Classical foraging theory states that animals feeding in a patchy environment can maximize their long term prey capture rates by quitting food patches when they have depleted prey to a certain threshold level. Thus in a patchy environment, where uncertainty is high, although public information use does not increase the foraging efficiency of groups over that of a lone forager, it definitely offers benefits over groups which do not and particularly where group size is large.

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Consumer-resource matching in a food chain when both predators and prey are free to move

Article Abstract:

Consumer-resource matching is studied in a community context. It is seen that the consumers consider the availability of their resource only in the resource-maximizing model, while in the balancing model individual consumers minimize predation risk per unit of the resource than they can gain access to.

Predatory animals, Resource partitioning (Ecology)

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