American White Pelican Predation on Cui-ui in Pyramid Lake, Nevada

Autor:	Donna Withers, Peter H. Rissler, Mark C. Fabes, Gayton G. Scoppettone
Rok vydání:	2014
Předmět:	Delta education.field_of_study River ecosystem Ecology biology Population Foraging Management Monitoring Policy and Law Aquatic Science biology.organism_classification Predation Fishery Pelican Geography biology.animal Netting education Ecology Evolution Behavior and Systematics Chasmistes cujus
Zdroj:	North American Journal of Fisheries Management. 34:57-67
ISSN:	1548-8675 0275-5947
DOI:	10.1080/02755947.2013.855278
Popis:	Anthropogenic changes to the Pyramid Lake–Truckee River ecosystem in Nevada are suspected to have altered the predator–prey balance between American white pelican Pelecanus erythrorhynchos and Cui-ui Chasmistes cujus. We estimated the loss of the adult Cui-ui population to pelican predation over a 13-year period by netting and tagging Cui-uis as they aggregated at the mouth of the Truckee River prior to their spawning migration into the Truckee River. Cui-ui access to the Truckee River typically required traversing a shallow delta (a foraging advantage for these American white pelicans). Dams and greater frequency of low stream flows also contributed to American white pelican foraging success. We used tag recoveries from Pyramid Lake's nesting colony of American white pelicans along with an experiment to estimate the chance of tag recovery within the colony to calculate the number of tagged fish taken by American white pelicans. We also used numbered tags to test whether there was a size preferenc...
Databáze:	OpenAIRE
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