Ocean warming and long-term change in pelagic bird abundance within the California current system
As a result of repeated sampling of pelagic bird abundance over 3 x 105 km2 of open ocean 4 times a year for 8 yr, we report that seabird abundance within the California Current system has declined by 40% over the period 1987 to 1994. This decline has accompanied a concurrent, long-term increase in...
Published in: | Marine Ecology Progress Series |
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InterResearch
1996
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Online Access: | https://oceanrep.geomar.de/id/eprint/52334/ https://oceanrep.geomar.de/id/eprint/52334/1/3254.pdf https://doi.org/10.3354/meps139011 |
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ftoceanrep:oai:oceanrep.geomar.de:52334 2023-05-15T17:52:20+02:00 Ocean warming and long-term change in pelagic bird abundance within the California current system Veit, Richard R. Pyle, Peter McGowan, John A. 1996 text https://oceanrep.geomar.de/id/eprint/52334/ https://oceanrep.geomar.de/id/eprint/52334/1/3254.pdf https://doi.org/10.3354/meps139011 en eng InterResearch https://oceanrep.geomar.de/id/eprint/52334/1/3254.pdf Veit, R. R., Pyle, P. and McGowan, J. A. (1996) Ocean warming and long-term change in pelagic bird abundance within the California current system. Open Access Marine Ecology Progress Series, 139 . pp. 11-18. DOI 10.3354/meps139011 <https://doi.org/10.3354/meps139011>. doi:10.3354/meps139011 cc_by_3.0 info:eu-repo/semantics/openAccess Article PeerReviewed 1996 ftoceanrep https://doi.org/10.3354/meps139011 2023-04-07T15:55:25Z As a result of repeated sampling of pelagic bird abundance over 3 x 105 km2 of open ocean 4 times a year for 8 yr, we report that seabird abundance within the California Current system has declined by 40% over the period 1987 to 1994. This decline has accompanied a concurrent, long-term increase in sea surface temperature. The decline in overall bird abundance is largely, but not entirely, a consequence of the 90% decline of sooty shearwaters Puffinus griseus, the numerically dominant species of the California Current. Seabirds of the offshore waters we sampled showed a different pattern from seabirds of the shelf and slope waters. Leach's storm-petrels Oceanodroma leucorhoa, the commonest species offshore, significantly increased during 1987 to 1994, while sooty shearwaters and other inshore species declined. Thus the clearest pattern that emerges from our data is one of gradual but persistent changes in abundance that transpire at time scales longer than 1 yr. Nevertheless, we did find evidence of change at shorter time scales (weeks and months) that may relate to the El Niño episode of 1992 to 1993: Pronounced positive anomalies of abundance of brown pelicans Pelecanus occidentalis and Heerman's gulls Larus heermani in fall 1991, and black Oceanodroma melania andleast O. microsoma storm-petrels in late summer 1992, likely reflect northward dispersal following reproductive failure in the Gulf of California. Article in Journal/Newspaper Oceanodroma leucorhoa OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Melania ENVELOPE(166.133,166.133,-78.117,-78.117) Marine Ecology Progress Series 139 11 18 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
As a result of repeated sampling of pelagic bird abundance over 3 x 105 km2 of open ocean 4 times a year for 8 yr, we report that seabird abundance within the California Current system has declined by 40% over the period 1987 to 1994. This decline has accompanied a concurrent, long-term increase in sea surface temperature. The decline in overall bird abundance is largely, but not entirely, a consequence of the 90% decline of sooty shearwaters Puffinus griseus, the numerically dominant species of the California Current. Seabirds of the offshore waters we sampled showed a different pattern from seabirds of the shelf and slope waters. Leach's storm-petrels Oceanodroma leucorhoa, the commonest species offshore, significantly increased during 1987 to 1994, while sooty shearwaters and other inshore species declined. Thus the clearest pattern that emerges from our data is one of gradual but persistent changes in abundance that transpire at time scales longer than 1 yr. Nevertheless, we did find evidence of change at shorter time scales (weeks and months) that may relate to the El Niño episode of 1992 to 1993: Pronounced positive anomalies of abundance of brown pelicans Pelecanus occidentalis and Heerman's gulls Larus heermani in fall 1991, and black Oceanodroma melania andleast O. microsoma storm-petrels in late summer 1992, likely reflect northward dispersal following reproductive failure in the Gulf of California. |
format |
Article in Journal/Newspaper |
author |
Veit, Richard R. Pyle, Peter McGowan, John A. |
spellingShingle |
Veit, Richard R. Pyle, Peter McGowan, John A. Ocean warming and long-term change in pelagic bird abundance within the California current system |
author_facet |
Veit, Richard R. Pyle, Peter McGowan, John A. |
author_sort |
Veit, Richard R. |
title |
Ocean warming and long-term change in pelagic bird abundance within the California current system |
title_short |
Ocean warming and long-term change in pelagic bird abundance within the California current system |
title_full |
Ocean warming and long-term change in pelagic bird abundance within the California current system |
title_fullStr |
Ocean warming and long-term change in pelagic bird abundance within the California current system |
title_full_unstemmed |
Ocean warming and long-term change in pelagic bird abundance within the California current system |
title_sort |
ocean warming and long-term change in pelagic bird abundance within the california current system |
publisher |
InterResearch |
publishDate |
1996 |
url |
https://oceanrep.geomar.de/id/eprint/52334/ https://oceanrep.geomar.de/id/eprint/52334/1/3254.pdf https://doi.org/10.3354/meps139011 |
long_lat |
ENVELOPE(166.133,166.133,-78.117,-78.117) |
geographic |
Melania |
geographic_facet |
Melania |
genre |
Oceanodroma leucorhoa |
genre_facet |
Oceanodroma leucorhoa |
op_relation |
https://oceanrep.geomar.de/id/eprint/52334/1/3254.pdf Veit, R. R., Pyle, P. and McGowan, J. A. (1996) Ocean warming and long-term change in pelagic bird abundance within the California current system. Open Access Marine Ecology Progress Series, 139 . pp. 11-18. DOI 10.3354/meps139011 <https://doi.org/10.3354/meps139011>. doi:10.3354/meps139011 |
op_rights |
cc_by_3.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3354/meps139011 |
container_title |
Marine Ecology Progress Series |
container_volume |
139 |
container_start_page |
11 |
op_container_end_page |
18 |
_version_ |
1766159736664752128 |