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Subarctic environmental changes are expected to affect the foraging ecologyof marine top predators, but the response to such changes may vary amongspecies if they use food resources differently. We examined thecharacteristics of foraging behavior of two sympatric congeneric divingseabird: common (Uria aalge: hereafter COMUs) and thick-billed(U. lomvia: hereafter TBMUs) murres breeding on St. George Island,located in the seasonal sea-ice region of the Bering Sea. We investigatedtheir foraging trip and flight durations, diel patterns of dive depth, andunderwater wing strokes, along with wing morphology and blood stable isotopesignatures and stress hormones. Acceleration–temperature–depth loggers wereattached to chick-guarding birds, and data were obtained from 7 COMUs and 12TBMUs. Both species showed similar mean trip duration (13.2 h for COMUs and10.5 h for TBMUs) and similar diurnal patterns of diving (frequent dives tovarious depths in the daytime and less frequent dives to shallow depths inthe nighttime). During the daytime, the dive depths of COMUs had two peaks inshallow (18.1 m) and deep (74.2 m) depths, while those of TBMUs were 20.2 mand 59.7 m. COMUs showed more frequent wing strokes during the bottom phaseof dives (1.90 s−1) than TBMUs (1.66 s−1). Fish occurred morefrequently in the bill loads of COMUs (85 %) than those of TBMUs(56 %). The δ15N value of blood was significantly higher in COMUs(14.5 ‰) than in TBMUs (13.1 ‰). The relatively small wingarea (0.053 m2) of COMUs compared to TBMUs (0.067 m2) mayfacilitate their increased agility while foraging and allow them to capturemore mobile prey such as larger fishes that inhabit deeper depths. Thesedifferences in food resource use may lead to the differential responses ofthe two murre species to marine environmental changes in the Bering Sea

Foraging segregation of two congeneric diving seabird species breeding on St. George Island, Bering Sea