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• W2003159350 abstract "Many Antarctic seabirds depend on prey that are patchy, cryptic, ephemeral, and unpredictable in location. These predators typically employ two alternative behavioral strategies for locating resource patches: direct visual or olfactory detection, and indirect detection (local enhancement) by sighting other predators that are already exploiting a patch. We developed a model of direct detection and local enhancement in seabirds that predicts how foraging success varies with behavioral strategy, seabird densities, and prey swarm density and detectability. Application of the model to Black-browed Albatrosses foraging for Antarctic krill near South Georgia suggests that local enhancement is generally a highly effective foraging strategy, and that the fraction of time albatrosses spend in feeding flocks should show strong interactions between prey and conspecific densities. To test these predictions, we analyzed survey data collected near South Georgia in January–March 1986. Our analysis suggests a strong Allee-type density dependence in foraging success that was qualitatively and quantitatively consistent with model predictions. This density dependence suggests a potential for destabilizing patterns of resource utilization and reproductive success in Black-browed Albatrosses that may have important implications for conservation of albatrosses and other Antarctic species." @default.
• W2003159350 created "2016-06-24" @default.
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• W2003159350 date "2003-12-01" @default.
• W2003159350 modified "2023-09-27" @default.
• W2003159350 title "BLACK-BROWED ALBATROSSES FORAGING ON ANTARCTIC KRILL: DENSITY-DEPENDENCE THROUGH LOCAL ENHANCEMENT?" @default.
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• W2003159350 doi "https://doi.org/10.1890/01-4098" @default.
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