The Efficacy of Reservoir Flow Regulation for Cooling Migration Temperature for Sockeye Salmon in the Nechako River Watershed of British Columbia

Autor:	D. A. Patterson, J. Morrison, J. S. Macdonald
Rok vydání:	2012
Předmět:	Ecology biology River watershed Hydrograph Management Monitoring Policy and Law Aquatic Science biology.organism_classification Water based Fishery Water temperature Flow regulation Oncorhynchus Environmental science Ecology Evolution Behavior and Systematics
Zdroj:	North American Journal of Fisheries Management. 32:415-427
ISSN:	1548-8675 0275-5947
DOI:	10.1080/02755947.2012.675946
Popis:	Since the early 1980s, a water temperature management program has been in existence on the Nechako River system in central British Columbia, Canada. The program releases water based on anticipated meteorological conditions in an attempt to prevent temperature from exceeding a specified threshold of 20°C downstream during a period when spawning migrations of sockeye salmon Oncorhynchus nerka are in the Nechako River. Since the inception of the program, this threshold has been exceeded only rarely; however, the variables that influence water temperature and that are used to manage water releases in the Nechako River watershed have not been subject to an independent analysis. Increasing demand for water at other times of year and a desire to restore a more natural hydrograph to the river to meet other ecological demands have impelled this analysis. A principal components analysis that examined the factors contributing to river temperature demonstrated that the summer controlled flow releases account...
Databáze:	OpenAIRE
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