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Biological/Geospatial Projects

aimed at answering important environmental questions

Colonial Waterbird Predation on Lost River and Shortnose Suckers in the Upper Klamath Basin

Project: Colonial Waterbird Predation on Lost River and Shortnose Suckers in the Upper Klamath Basin

Client: Bureau of Reclamation & U.S. Fish and Wildlife Service

Year: 2015

Location: Upper Klamath Basin, Oregon & California

 

With our partner U.S. Geological Survey, we conducted a study to evaluate predation on Lost River Suckers and Shortnose Suckers, both listed as endangered under the U.S. Endangered Species Act, by American white pelicans and double-crested cormorants nesting in the Upper Klamath Basin, during 2009-2014. Predation was evaluated by recovering (detecting) passive integrated transponder (PIT) tags on bird colonies and calculating minimum predation rates, as the percentage of available suckers consumed, adjusted for PIT tag detection probabilities. Results indicate that avian predation impacts varied by sucker species, age-class (adult, juvenile), bird colony location, and year, demonstrating dynamic predator-prey interactions. Study results are being used by the USFWS Recovery Implementation Team to identify and prioritize future sucker research, monitoring, and management activities in Upper Klamath Basin.

 

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