NDLI: Recovery of Coded Wire Tags at a Caspian Tern Colony in San Francisco Bay: A Technique to Evaluate Impacts of Avian Predation on Juvenile Salmonids

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Recovery of Coded Wire Tags at a Caspian Tern Colony in San Francisco Bay: A Technique to Evaluate Impacts of Avian Predation on Juvenile Salmonids

Content Provider	Semantic Scholar
Author	Evans, Allen F. Roby, Daniel D. Collis, Ken Cramer, Bradley M. Sheggeby, John A. Adrean, Lindsay J. Battaglia, Daniel Lyons, Donald E.
Copyright Year	2011
Abstract	Abstract We recovered coded wire tags (CWTs) from a colony of Caspian terns Hydroprogne caspia on Brooks Island in San Francisco Bay, California, to evaluate predation on juvenile salmonids originating from the Sacramento and San Joaquin rivers. Subsamples of colony substrate representing 11.7% of the nesting habitat used by the terns yielded 2,079 salmonid CWTs from fish released and subsequently consumed by terns in 2008. The estimated number of CWTs deposited on the entire tern colony was 40,143 (ranging from 26,763 to 80,288), once adjustments were made to account for tag loss and the total amount of nesting habitat used by terns. Tags ingested by terns and then egested on the colony were undamaged, and the tags’ complete numeric codes were still identifiable. The CWTs found on the tern colony indicated that hatchery Chinook salmon Oncorhynchus tshawytscha trucked to and released in San Pablo Bay were significantly more likely to be consumed by Caspian terns than Chinook salmon that migrated in-river ...
Starting Page	79
Ending Page	87
Page Count	9
File Format	PDF HTM / HTML
DOI	10.1080/02755947.2011.562429
Volume Number	31
Alternate Webpage(s)	http://www.birdresearchnw.org/Evans_et_al%20_2011.pdf
Alternate Webpage(s)	https://doi.org/10.1080/02755947.2011.562429
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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