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Author Ainley,D. G.; Wilson,P. R.; Barton,K. J.; Ballard,G.; Nur,N.; Karl,B. pdf  openurl
  Title Diet and Foraging Effort of Adelie Penguins in Relation to Pack-Ice Conditions in the Southern Ross Sea Type Journal Article
  Year 1998 Publication Polar Biology Abbrev Journal  
  Volume 20 Issue 5 Pages 311-319  
  Corporate Author Thesis  
  Address  
  Keywords Food-Web; Antarctica; Attachment; Seabirds; Populations; Islands; Krill; Areas  
  Abstract We investigated the diet and aspects of foraging effort among Adelie penguins (Pygoscelis adeliae) breeding at three colonies on Ross Island, in the southwestern Ross Sea - Gapes Royds, Bird and Crozier - during the chick-provisioning period of three austral summers, 1994-1995, 1995-1996 and 1996-1997. During the study period, pack-ice cover differed in waters offshore of these colonies, by colony, seasons and year. Diet differed among colonies only slightly. The fish Pleuragramma antarcticum was the most important prey, especially during years or periods within years when little pack ice was present. With respect to krill, which composed the remainder of diet, juvenile Euphausia crystallorophias were consumed predominantly in a year of heavy pack-ice cover; more adult krill were consumed in 2 years when pack ice was sparse. Foraging trip duration differed by colony, season and year and was related directly to distance from the colony to the nearest pack ice. The amount of food brought to chicks increased as trip duration increased, to a point (2 days), but then decreased as duration increased further (up to 4 days). On the basis of data on mass of parents and of meal sizes to chicks, it appeared that on the longest trips more of the food gathered by parents was used for self maintenance: on the longest trips, parents lost body mass. Successful foraging during chick rearing, the period when adult foraging is most intense, appears to depend on the proximity of pack ice to nesting colonies for this penguin species.  
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  Call Number Serial 7292  
Contribution Id PRBO Orig Record (down) Serial 7292  
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