Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Does Prey Preference Affect Habitat Choice in Antarctic Seabirds.
Author Ainley, D. G. ; Ribic, C. A. ; Fraser, W. R. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Point Reyes Bird Observatory, Stinson Beach, CA.
Publisher c1992
Year Published 1992
Report Number EPA/600/J-93/150;
Stock Number PB93-191476
Additional Subjects Birds ; Feeding habits ; Habitats ; Antarctica ; Animal behavior ; Food consumption ; Diets ; Prey fish ; Reprints ; Prey preference ; Seabirds
Library Call Number Additional Info Location Last
NTIS  PB93-191476 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 08/23/1993
Collation 16p
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.)