||Does Prey Preference Affect Habitat Choice in Antarctic Seabirds.
Ainley, D. G. ;
Ribic, C. A. ;
Fraser, W. R. ;
||Corvallis Environmental Research Lab., OR. ;Point Reyes Bird Observatory, Stinson Beach, CA.
Feeding habits ;
Animal behavior ;
Food consumption ;
Prey fish ;
Prey preference ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||Diet composition of the members of 2 seabird species assemblages in the Scotia-Weddell Confluence region, Antarctica, was investigated during 3 seasons/years: spring 1983, autumn 1986, and winter 1988. One assemblage frequented the pack ice and the other was present in adjacent open waters; most members of the latter species assemblage vacated the Antarctic during winter. The authors sought answers to 2 questions: (1) Did the 2 species assemblages depend on food webs that differed substantially; and (2) Was there a trophic basis to explain why the pack-ice assemblage did not expand into the open water left vacant by the other during winter. To test a priori hypothesis that diet was affected by habitat, diet samples were obtained from birds encountered in 3 habitats: open water, sparse concentrations of ice, and heavy ice cover. Cluster analysis showed broad overlap in seabird diet regardless of species, habitat (ice/water mass) or year. Seabirds exploited prey largely according to ranked availability, although they appeared to choose the larger fish and crustaceans over smaller crustaceans. Myctophids in particular, but also krill and squid, were the main prey groups. (Copyright (c) Inter-Research 1992.)
||Pub. in Marine Ecology Progress Series, v90 p207-221 28 Dec 92. Prepared in cooperation with Point Reyes Bird Observatory, Stinson Beach, CA.
|NTIS Title Notes
||Reprint: Does Prey Preference Affect Habitat Choice in Antarctic Seabirds.
||57Z; 57H; 47D
||PC A03/MF A01