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Colony Connectivity of Pacific Coast Double-Crested Cormorants Based on Post-Breeding Dispersal From the Region’s Largest Colony

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dc.creator Courtot, Karen N.
dc.creator Roby, Daniel D.
dc.creator Adkins, Jessica Y.
dc.creator Lyons, Donald E.
dc.creator King, D. Tommy
dc.creator Larsen, R. Scott
dc.date.accessioned 2012-10-09T17:15:45Z
dc.date.available 2012-10-09T17:15:45Z
dc.date.issued 2012-09
dc.identifier.citation Courtot, K. N., Roby, D. D., Adkins, J. Y., Lyons, D. E., King, D. T. and Larsen, R. S. (2012), Colony connectivity of Pacific Coast double-crested cormorants based on post-breeding dispersal from the region's largest colony . The Journal of Wildlife Management, 76: 1462–1471. doi: 10.1002/jwmg.403 en_US
dc.identifier.uri http://hdl.handle.net/1957/34260
dc.description This is the publisher’s final pdf. The published article is copyrighted by John Wiley & Sons, Inc. and can be found at: http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291937-2817. 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 To reduce conflicts with fish resources, other colonial waterbirds, and damage to habitats, double-crested cormorants (Phalacrocorax auritus) are currently controlled (lethally and non-lethally) throughout much of their range. Concerns are growing over the Pacific Coast's largest double-crested cormorant colony at East Sand Island (ESI), Oregon near the mouth of the Columbia River, where cormorants forage on juvenile salmonids, many of which are listed under the United States Endangered Species Act. Management of this colony is currently under consideration and may call for a redistribution of a portion of this colony numbering more than 12,000 breeding pairs in 2009. We investigated regional and site-specific connectivity of ESI cormorants using satellite-telemetry to track post-breeding dispersal. Cormorants dispersed widely west of the Cascade-Sierra Nevada Mountains from British Columbia, Canada to northern Mexico. Tracking data demonstrated direct connectivity between the double-crested cormorant colony at ESI and nesting sites throughout the dispersal area. Results of this study indicate that some cormorants from ESI could disperse to prospect for nesting sites throughout much of the western portion of the range of the Western Population; however, regional variation in connectivity with the ESI population, distance from ESI, and site-specific nesting history will likely result in variable prospecting rates among regions and sub-regions. Management efforts aimed at redistributing ESI cormorants across western North America (e.g., social attraction or dissuasion techniques) might be best allocated to areas or sites known to be used by tagged cormorants, particularly those sites with an established nesting history en_US
dc.description.sponsorship Funding was provided by the U.S. Army Corps of Engineers, Portland District, Portland, Oregon (G. Dorsey and P. Schmidt) and the Bonneville Power Administration, Portland, Oregon (D. Welch). Permits were granted by the U.S. Fish and Wildlife Service (Region 1 Migratory Bird Office, Portland, OR) and the Oregon Department of Fish and Wildlife (Salem, OR). en_US
dc.language.iso en_US en_US
dc.publisher John Wiley & Sons, Inc. en_US
dc.relation.ispartofseries The Journal of Wildlife Management en_US
dc.relation.ispartofseries Vol. 76 no. 7 en_US
dc.subject breeding dispersal en_US
dc.subject cormorant en_US
dc.subject Phalacrocorax auritus en_US
dc.subject prospecting en_US
dc.subject redistribution en_US
dc.subject satellite-telemetry. en_US
dc.title Colony Connectivity of Pacific Coast Double-Crested Cormorants Based on Post-Breeding Dispersal From the Region’s Largest Colony en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.1002/jwmg.403

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