Food of emperor penguins (Aptenodytes forsteri)
Abstract The diet of the emperor penguin Aptenodytes forsteri in the western Ross Sea during spring was in-vestigated by analysis of stomach contents sampled at three dierent localities. At Cape Washington, emperor penguins feeding chicks consistently preyed on fishes (89 to 95 % by mass) and crusta...
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| Format: | Text |
| Language: | English |
| Published: |
1997
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.457.1164 http://www.cebc.cnrs.fr/publipdf/1998/CMB130.pdf |
| Summary: | Abstract The diet of the emperor penguin Aptenodytes forsteri in the western Ross Sea during spring was in-vestigated by analysis of stomach contents sampled at three dierent localities. At Cape Washington, emperor penguins feeding chicks consistently preyed on fishes (89 to 95 % by mass) and crustaceans (5 to 11%) over the four spring seasons examined. By far the commonest prey was the Antarctic silverfish Pleuragramma antarc-ticum (89 % of the fish prey); the remainder of fish prey were mainly unidentified juveniles of dierent species of channichthyid fishes. Three species dominated the crus-tacean part of the diet, i.e. the gammarid amphipods Abyssorchomene rossi/plebs (30 % of the crustacean prey) and Eusirus microps (22%), together with the euphausiid Euphausia crystallorophias (24%). At Coulman Island and Cape Roget, fishes, mainly P. antarcticum, formed the bulk of the food (88 and 93 % by mass, respectively), crustaceans were minor prey (2.5 and 0.4%), and the squid Psychroteuthis glacialis accounted for a small but significant part of the food (3.5 and 0.8%). This study emphasizes the importance of the small, shoaling pelagic fish Pleuragramma antarcticum as a key link between zooplankton and top predators, including seabirds, in the food web and marine ecosystem of the Ross Sea. |
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