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RECORD NUMBER: 40 OF 205

OLS Field Name OLS Field Data
Main Title Ecological Structure among Migrant and Resident Seabirds of the Scotia-Weddell Confluence Region.
Author Ainley, D. G. ; Ribic, C. A. ; Fraser, W. R. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Point Reyes Bird Observatory, Stinson Beach, CA. ;Old Dominion Univ., Norfolk, VA.;National Science Foundation, Arlington, VA.
Publisher c1994
Year Published 1994
Report Number EPA/600/J-94/300; NSF-DPP8304815 ;NSF-DPP8419894;
Stock Number PB94-190543
Additional Subjects Birds ; Habitats ; Assessments ; Scatia Sea ; Weddell Sea ; Marine biology ; Aquatic ecosystems ; Changes ; Animal migrations ; Seasonal variations ; Density(Mass/Volume) ; Ocean temperature ; Seasonal variations ; Antarctic regions ; Species diversity ; Pack ice ; Pelagic zone ; Tables(Data) ; Environmental protection ; Reprints ; Seabirds
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NTIS  PB94-190543 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 11/11/1994
Collation 21p
Abstract
The report quantitatively assesses seasonal changes in community structure and habitat selection among seabirds in the Scotia-Weddell Confluence region, Antarctica. Discussed are biological and physical factors underlying the patterns. Data were derived from strip-transects on closely-coordinated multidisciplinary cruises that characterized the physics and biology during Spring 1983, autumn 1986 and winter 1988. Described for the first time ever for the Southern Ocean, seasonal changes in seabird communities in terms of composition, using cluster analysis, as well as relative density and diversity among species. Sea-surface temperature, distance to the pack ice edge and ice type, all physical characteristics of habitat, were the most important environmental variables that affected assemblage composition. Three recurrent assemblages of species were identified. One persistent assemblage, present year round, was associated with the pack ice; another was associated with open waters immediately adjacent to the ice; and a third was a far-from-ice assemblage.