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Foraging by murres (Uria spp.) at tidal fronts surrounding the Pribilof Islands, Alaska, USA
Decker, M.B. & Hunt, G.L.jr (1996) Mar Ecol Prog Ser 139:1-10
We investigated the foraging distribution of 2 species of murres (Uria lomvia and U. aalge) in relation to Acoustically Determined Biomass (ADB) and hydrographic structure surrounding the Pribilof Islands, Bering Sea, Alaska, USA. The distribution and abundance of both murre species were similar, therefore, we combined the data for Thick-billed and Common Murres in the analysis. We found that murre densities were higher in frontal regions than in non-frontal regions. Maximum ADB was also found to be elevated in the frontal zone. Within frontal regions, higher densities of murres were associated with regions containing relatively high levels of ADB. In contrast, we did not find significant correlations between murre density and ADB in the study area as a whole. We postulate that murres restrict their foraging to the frontal region because prey can be located more predictably within this zone that in other foraging areas in the vicinity of the Pribilof Islands.

Keywords: Seabird distribution, Tidal fronts, Uria lomvia, Uria aalge, Murres, Bering Sea


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