Diet and foraging effort of Adelie penguins in relation to pack-ice conditions in the southern Ross Sea
作者： David G. Ainley , Peter R. Wilson , Kerry J. Barton , Grant Ballard , Nadav Nur
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摘要: We investigated the diet and aspects of for- aging eAort among Adelie penguins (Pygoscelis adeliae) breeding at three colonies on Ross Island, in southwestern Sea - Capes Royds, Bird Crozier during chick-provisioning period austral summers, 1994-1995, 1995-1996 1996-1997. During study period, pack-ice cover diAered waters oA- shore these colonies, by colony, seasons year. Diet only slightly. The fish Pleuragramma antarcticum was most important prey, especially years or periods within when little pack ice present. With respect to krill, which composed remainder diet, juvenile Euphausia crystallorophias were consumed predominantly a year heavy cover; more adult krill 2 sparse. Foraging trip du- ration season related directly distance from colony nearest ice. amount food brought chicks increased as duration increased, point (2 days), but then decreased further (up 4 days). On basis data mass parents meal sizes chicks, it appeared that longest trips gathered used for self maintenance; trips, lost body mass. Successful foraging chick rearing, pe- riod is intense, appears depend proximity nesting this penguin species.
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