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Trends in Caspian Tern Nesting and Diet in San Francisco Bay: Conservation Implications for Terns and Salmonids

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dc.creator Collis, Ken
dc.creator Roby, Daniel D.
dc.creator Larson, Keith W.
dc.creator Adrean, Lindsay J.
dc.creator Nelson, S. Kim
dc.creator Evans, Allen F.
dc.creator Hostetter, Nathan
dc.creator Battaglia, Dan
dc.creator Lyons, Donald E.
dc.creator Marcella, Tim
dc.creator Patterson, Allison
dc.date.accessioned 2012-10-18T21:44:48Z
dc.date.available 2012-10-18T21:44:48Z
dc.date.issued 2012-03
dc.identifier.citation Collis, K., Roby, D. D., Larson, K. W., Adrean, L. J., Nelson, S. K., Evans, A. F., & Hostetter, N. (2012, March). Trends in Caspian Tern Nesting and Diet in San Francisco Bay: Conservation Implications for Terns and Salmonids. Waterbirds, 35(1), 25-34. doi:10.1675/063.035.0103 en_US
dc.identifier.uri http://hdl.handle.net/1957/34535
dc.description This is the publisher’s final pdf. The published article is copyrighted by The Waterbird Society and can be found at: http://www.waterbirds.org/journal. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. en_US
dc.description.abstract Colony size, nesting ecology and diet of Caspian Terns (Hydroprogne caspia) were investigated in the San Francisco Bay area (SFBA) during 2003-2009 to assess the potential for conservation of the tern breeding population and possible negative effects of predation on survival of juvenile salmonids (Oncorhynchus spp.). Numbers of breeding Caspian Terns declined 36% from 2003 to 2009, mostly due to abandonment of the Knight Island colony and decline of the Brooks Island colony, the two largest colonies in the SFBA. Concurrently, nesting success declined 69% associated with colony site characteristics such as (a) quality and quantity of nesting substrate, (b) vulnerability to nest predators, (c) displacement by other colonial waterbirds and (d) human disturbance. Marine fishes were the predominant prey in tern diets from the SFBA; however, diet composition varied among colonies. Juvenile salmonids comprised 22.9% of the diet of terns nesting in the North Bay, 5.3% of diet of terns nesting in the Central Bay, and 0.1% in the South Bay. Construction or restoration of nesting islands in the South Bay may help maintain and restore breeding Caspian Terns without enhancing mortality of salmonid stocks of conservation concern. en_US
dc.description.sponsorship The U.S. Army Corps of Engineers (USACE) – Portland District and the U.S. Fish and Wildlife Service (USFWS), Pacific Region, Migratory Birds and Habitat Programs funded this research. The study was performed under the auspices of the Oregon State University Institutional Animal Care and Use Committee (protocol no. 3722). en_US
dc.language.iso en_US en_US
dc.publisher The Waterbird Society en_US
dc.relation.ispartofseries Waterbirds en_US
dc.relation.ispartofseries Vol. 35 no. 1 en_US
dc.subject Caspian Tern en_US
dc.subject colony restoration en_US
dc.subject colony size en_US
dc.subject diet composition en_US
dc.subject Hydroprogne caspia en_US
dc.subject limiting factors en_US
dc.subject productivity en_US
dc.subject Oncorhynchus en_US
dc.subject salmonids en_US
dc.subject San Francisco Bay en_US
dc.title Trends in Caspian Tern Nesting and Diet in San Francisco Bay: Conservation Implications for Terns and Salmonids en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.1675/063.035.0103

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