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RECORD NUMBER: 723 OF 868

OLS Field Name OLS Field Data
Main Title Species-Habitat Relationships among Antarctic Seabirds: A Function of Physical or Biological Factors.
Author Ainley, D. G. ; Ribic, C. A. ; Spear, L. B. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Point Reyes Bird Observatory, Stinson Beach, CA.;National Science Foundation, Washington, DC.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-94/092; NSF-DPP-84-19894;
Stock Number PB94-146313
Additional Subjects Birds ; Pack ice ; Habitats ; Southern Ocean ; Storms ; Antarctic regions ; Pelagic zone ; Diets ; Physical properties ; Variations ; Adaptation ; Sea birds ; Alteration
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB94-146313 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 05/14/1994
Collation 14p
Abstract
The authors employed a natural experiment to evaluate the hypothesis that a major physical feature of high-latitude marine habitat, the percentage of the sea covered by pack ice, affects species composition among Antarctic seabirds. The experiment entailed replicate transects through markedly altered physical habitat in the Scotia-Weddell Confluence: a series of storms caused the pact iceto advance and retreat rapidly and repeatedly over a 200-km wide area. Regardless of where their habitat moved, pack ice and open-water species occurred at significantly higher densities in the ice and open-water habitats, respectively. There were no time lags in the response of species to habitat alteration. In addition, pack-ice and open-water species had identifical diets regardless of where their preferred habitat was located. These results supported the hypothesis and showed that physical rather than biological variables affect species composition among pelagic assemblages of Antarctic sea-birds. (Copyright (c) The Cooper Ornithological Society 1993.)