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dc.contributor.authorTrites, Andrew W.
dc.contributor.authorMiller, Arthur J.
dc.contributor.authorMaschner, Herbert D.G.
dc.contributor.authorAlexander, Michael A.
dc.contributor.authorBograd, Steven J.
dc.contributor.authorCalder, John A.
dc.contributor.authorCapotondi, Antonietta
dc.contributor.authorCoyle, Kenneth O.
dc.contributor.authorDiLorenzo, Emanuele
dc.contributor.authorFinney, Bruce P.
dc.contributor.authorGregr, Edward J.
dc.contributor.authorGrosch, Chester E.
dc.contributor.authorHare, Steven R.
dc.contributor.authorHunt, George L. Jr.
dc.contributor.authorJahncke, Jaime
dc.contributor.authorKachel, Nancy B.
dc.contributor.authorKim, Hey-Jin
dc.contributor.authorLadd, Carol
dc.contributor.authorMantua, Nathan J.
dc.contributor.authorMarzban, Caren
dc.contributor.authorMaslowski, Wieslaw
dc.contributor.authorMendelssohn, Roy
dc.contributor.authorNeilson, Douglas J.
dc.contributor.authorOkkonen, Stephen R.
dc.contributor.authorOverland, James F.
dc.contributor.authorReedy-Maschner, Katherine L.
dc.contributor.authorRoyer, Thomas C.
dc.contributor.authorSchwing, Franklin B.
dc.contributor.authorWang, Julian X.L.
dc.contributor.authorWinship, Arliss J.
dc.date.accessioned2016-03-29T22:14:20Z
dc.date.available2016-03-29T22:14:20Z
dc.date.issued2007
dc.identifier.citationFisheries Oceanography, v. 16, no. 1, pp.46-67, 2007en_US
dc.identifier.urihttp://hdl.handle.net/10945/48244
dc.descriptionThe article of record as published may be found at http://dx.doi.org/10.1111/j.1365-2419.2006.00408.xen_US
dc.description.abstractDeclines 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.en_US
dc.format.extent22 p.en_US
dc.publisherBlackwell Publishing Ltd.en_US
dc.titleBottom-up forcing and the decline of Steller sea lions (Eumetopias jubatus) in Alaska: assessing the ocean climate hypothesisen_US
dc.typeArticleen_US
dc.contributor.corporateNaval Postgraduate School (U.S.)en_US
dc.contributor.departmentOceanographyen_US
dc.subject.authorAleutian Islandsen_US
dc.subject.authorClimate regime shiften_US
dc.subject.authorGulf of Alaskaen_US
dc.subject.authorStellar sea lionen_US


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