ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION
Report quantitatively assesses seasonal changes in community structure and habitat selection among seabirds in the Scotia-Weddell Confluence region, Antarctica. iscussed are biological and physical factors underlying the patterns. ata were derived from strip-transects on closely-coordinated multidis...
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ftepa:oai:epaEIMS:33119 2023-05-15T13:39:31+02:00 ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION D.G. Ainley C.A. Ribic W.R. Fraser 2005-12-22T16:31:09Z http://oaspub.epa.gov/eims/eimsapi.dispdetail?deid=33119 unknown http://www.ntis.gov/search/product.asp?ABBR=PB94190543&starDB=GRAHIST Office of Research and Development Text 2005 ftepa 2007-11-21T13:41:10Z Report quantitatively assesses seasonal changes in community structure and habitat selection among seabirds in the Scotia-Weddell Confluence region, Antarctica. iscussed are biological and physical factors underlying the patterns. ata were derived from strip-transects on closely-coordinated multidisciplinary cruises that characterized the physics and biology during Spring 1983, autumn 1986 and winter 1988. escribed 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. ea-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. hree 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. nly the two open-water assemblages changed markedly on a seasonal basis. lose similarity of patterns in the spring of 1983 data with those collected during spring 1976 in the Ross Sea, on the other side of Antarctica, supported the contention that the authors were comparing seasonal and not interannual differences in community structure. n spite of a major reduction in the number and density of species in the open-water assemblages during winter, the pack-ice assemblage exhibited no habitat expansion, which might be expected if competition affected community structure and habitat selection. Text Antarc* Antarctica Ross Sea Southern Ocean Environmental Protection Agency (EPA): Science Inventory Ross Sea Southern Ocean Weddell |
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Open Polar |
collection |
Environmental Protection Agency (EPA): Science Inventory |
op_collection_id |
ftepa |
language |
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description |
Report quantitatively assesses seasonal changes in community structure and habitat selection among seabirds in the Scotia-Weddell Confluence region, Antarctica. iscussed are biological and physical factors underlying the patterns. ata were derived from strip-transects on closely-coordinated multidisciplinary cruises that characterized the physics and biology during Spring 1983, autumn 1986 and winter 1988. escribed 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. ea-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. hree 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. nly the two open-water assemblages changed markedly on a seasonal basis. lose similarity of patterns in the spring of 1983 data with those collected during spring 1976 in the Ross Sea, on the other side of Antarctica, supported the contention that the authors were comparing seasonal and not interannual differences in community structure. n spite of a major reduction in the number and density of species in the open-water assemblages during winter, the pack-ice assemblage exhibited no habitat expansion, which might be expected if competition affected community structure and habitat selection. |
format |
Text |
author |
D.G. Ainley C.A. Ribic W.R. Fraser |
spellingShingle |
D.G. Ainley C.A. Ribic W.R. Fraser ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION |
author_facet |
D.G. Ainley C.A. Ribic W.R. Fraser |
author_sort |
D.G. Ainley |
title |
ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION |
title_short |
ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION |
title_full |
ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION |
title_fullStr |
ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION |
title_full_unstemmed |
ECOLOGICAL STRUCTURE AMONG MIGRANT AND RESIDENT SEABIRDS OF THE SCOTIA-WEDDELL CONFLUENCE REGION |
title_sort |
ecological structure among migrant and resident seabirds of the scotia-weddell confluence region |
publishDate |
2005 |
url |
http://oaspub.epa.gov/eims/eimsapi.dispdetail?deid=33119 |
geographic |
Ross Sea Southern Ocean Weddell |
geographic_facet |
Ross Sea Southern Ocean Weddell |
genre |
Antarc* Antarctica Ross Sea Southern Ocean |
genre_facet |
Antarc* Antarctica Ross Sea Southern Ocean |
op_source |
Office of Research and Development |
op_relation |
http://www.ntis.gov/search/product.asp?ABBR=PB94190543&starDB=GRAHIST |
_version_ |
1766119952368009216 |