Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis
Declines of Steller sea lion ( Eumetopias jubatus) populations in the Aleutian Islands and Gulf of Alaska could be a consequence of physical oceanographic changes associated with the 1976–77 climate regime shift. Changes in ocean climate are hypothesized to have affected the quantity, quality, and a...
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ftolddominionuni:oai:digitalcommons.odu.edu:ccpo_pubs-1060 2023-12-17T10:51:34+01:00 Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis Trites, Andrew W. Miller, Arthur J. Alexander, Michael A. Bograd, Steven J. Calder, John A. Capotondi, Antonietta Coyle, Kenneth O. Lorenzo, Emanuele Di Finney, Bruce P. Gregr, Edward J. Grosch, Chester E. Royer, Thomas C. 2007-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/ccpo_pubs/191 https://doi.org/10.1111/j.1365-2419.2006.00408.x https://digitalcommons.odu.edu/context/ccpo_pubs/article/1060/viewcontent/Trites_2007_Bottom_up_forcing_and_the_decline.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/ccpo_pubs/191 doi:10.1111/j.1365-2419.2006.00408.x https://digitalcommons.odu.edu/context/ccpo_pubs/article/1060/viewcontent/Trites_2007_Bottom_up_forcing_and_the_decline.pdf Copyright of Fisheries Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) CCPO Publications Steller's sea lion Animals population biology Aquatic animals Population dynamics Ocean atmosphere interaction Climatic changes Sea lions Life zones Zoogeography Alaska Aleutian Islands Climate regime shift Gulf of Alaska Steller Sea Lion Climate Oceanography Population Biology article 2007 ftolddominionuni https://doi.org/10.1111/j.1365-2419.2006.00408.x 2023-11-20T19:09:54Z Declines of Steller sea lion ( Eumetopias jubatus) populations in the Aleutian Islands and Gulf of Alaska could be a consequence of physical oceanographic changes associated with the 1976–77 climate regime shift. Changes in ocean climate are hypothesized to have affected the quantity, quality, and accessibility of prey, which in turn may have affected the rates of birth and death of sea lions. Recent studies of the spatial and temporal variations in the ocean climate system of the North Pacific support this hypothesis. Ocean climate changes appear to have created adaptive opportunities for various species that are preyed upon by Steller sea lions at mid-trophic levels. The east–west asymmetry of the oceanic response to climate forcing after 1976–77 is consistent with both the temporal aspect (populations decreased after the late 1970s) and the spatial aspect of the decline (western, but not eastern, sea lion populations decreased). These broad-scale climate variations appear to be modulated by regionally sensitive biogeographic structures along the Aleutian Islands and Gulf of Alaska, which include a transition point from coastal to open-ocean conditions at Samalga Pass westward along the Aleutian Islands. These transition points delineate distinct clusterings of different combinations of prey species, which are in turn correlated with differential population sizes and trajectories of Steller sea lions. Archaeological records spanning 4000 yr further indicate that sea lion populations have experienced major shifts in abundance in the past. Shifts in ocean climate are the most parsimonious underlying explanation for the broad suite of ecosystem changes that have been observed in the North Pacific Ocean in recent decades. [ABSTRACT FROM AUTHOR] Article in Journal/Newspaper Alaska Aleutian Islands Old Dominion University: ODU Digital Commons Gulf of Alaska Pacific Fisheries Oceanography 16 1 46 67 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Steller's sea lion Animals population biology Aquatic animals Population dynamics Ocean atmosphere interaction Climatic changes Sea lions Life zones Zoogeography Alaska Aleutian Islands Climate regime shift Gulf of Alaska Steller Sea Lion Climate Oceanography Population Biology |
spellingShingle |
Steller's sea lion Animals population biology Aquatic animals Population dynamics Ocean atmosphere interaction Climatic changes Sea lions Life zones Zoogeography Alaska Aleutian Islands Climate regime shift Gulf of Alaska Steller Sea Lion Climate Oceanography Population Biology Trites, Andrew W. Miller, Arthur J. Alexander, Michael A. Bograd, Steven J. Calder, John A. Capotondi, Antonietta Coyle, Kenneth O. Lorenzo, Emanuele Di Finney, Bruce P. Gregr, Edward J. Grosch, Chester E. Royer, Thomas C. Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis |
topic_facet |
Steller's sea lion Animals population biology Aquatic animals Population dynamics Ocean atmosphere interaction Climatic changes Sea lions Life zones Zoogeography Alaska Aleutian Islands Climate regime shift Gulf of Alaska Steller Sea Lion Climate Oceanography Population Biology |
description |
Declines of Steller sea lion ( Eumetopias jubatus) populations in the Aleutian Islands and Gulf of Alaska could be a consequence of physical oceanographic changes associated with the 1976–77 climate regime shift. Changes in ocean climate are hypothesized to have affected the quantity, quality, and accessibility of prey, which in turn may have affected the rates of birth and death of sea lions. Recent studies of the spatial and temporal variations in the ocean climate system of the North Pacific support this hypothesis. Ocean climate changes appear to have created adaptive opportunities for various species that are preyed upon by Steller sea lions at mid-trophic levels. The east–west asymmetry of the oceanic response to climate forcing after 1976–77 is consistent with both the temporal aspect (populations decreased after the late 1970s) and the spatial aspect of the decline (western, but not eastern, sea lion populations decreased). These broad-scale climate variations appear to be modulated by regionally sensitive biogeographic structures along the Aleutian Islands and Gulf of Alaska, which include a transition point from coastal to open-ocean conditions at Samalga Pass westward along the Aleutian Islands. These transition points delineate distinct clusterings of different combinations of prey species, which are in turn correlated with differential population sizes and trajectories of Steller sea lions. Archaeological records spanning 4000 yr further indicate that sea lion populations have experienced major shifts in abundance in the past. Shifts in ocean climate are the most parsimonious underlying explanation for the broad suite of ecosystem changes that have been observed in the North Pacific Ocean in recent decades. [ABSTRACT FROM AUTHOR] |
format |
Article in Journal/Newspaper |
author |
Trites, Andrew W. Miller, Arthur J. Alexander, Michael A. Bograd, Steven J. Calder, John A. Capotondi, Antonietta Coyle, Kenneth O. Lorenzo, Emanuele Di Finney, Bruce P. Gregr, Edward J. Grosch, Chester E. Royer, Thomas C. |
author_facet |
Trites, Andrew W. Miller, Arthur J. Alexander, Michael A. Bograd, Steven J. Calder, John A. Capotondi, Antonietta Coyle, Kenneth O. Lorenzo, Emanuele Di Finney, Bruce P. Gregr, Edward J. Grosch, Chester E. Royer, Thomas C. |
author_sort |
Trites, Andrew W. |
title |
Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis |
title_short |
Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis |
title_full |
Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis |
title_fullStr |
Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis |
title_full_unstemmed |
Bottom-Up Forcing And The Decline of Steller Sea Lions (Eumetopias jubatus) In Alaska: Assessing The Ocean Climate Hypothesis |
title_sort |
bottom-up forcing and the decline of steller sea lions (eumetopias jubatus) in alaska: assessing the ocean climate hypothesis |
publisher |
ODU Digital Commons |
publishDate |
2007 |
url |
https://digitalcommons.odu.edu/ccpo_pubs/191 https://doi.org/10.1111/j.1365-2419.2006.00408.x https://digitalcommons.odu.edu/context/ccpo_pubs/article/1060/viewcontent/Trites_2007_Bottom_up_forcing_and_the_decline.pdf |
geographic |
Gulf of Alaska Pacific |
geographic_facet |
Gulf of Alaska Pacific |
genre |
Alaska Aleutian Islands |
genre_facet |
Alaska Aleutian Islands |
op_source |
CCPO Publications |
op_relation |
https://digitalcommons.odu.edu/ccpo_pubs/191 doi:10.1111/j.1365-2419.2006.00408.x https://digitalcommons.odu.edu/context/ccpo_pubs/article/1060/viewcontent/Trites_2007_Bottom_up_forcing_and_the_decline.pdf |
op_rights |
Copyright of Fisheries Oceanography is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) |
op_doi |
https://doi.org/10.1111/j.1365-2419.2006.00408.x |
container_title |
Fisheries Oceanography |
container_volume |
16 |
container_issue |
1 |
container_start_page |
46 |
op_container_end_page |
67 |
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1785576861567287296 |