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Titolo:
Climate regimes and water temperature changes in the Columbia River: bioenergetic implications for predators of juvenile salmon
Autore:
Petersen, JH; Kitchell, JF;
Indirizzi:
US Geol Survey, Western Fisheries Res Ctr, Columbia River Res Lab, Cook, WA 98605 USA US Geol Survey Cook WA USA 98605 lumbia River Res Lab, Cook, WA 98605 USA Univ Wisconsin, Ctr Limnol, Madison, WI 53706 USA Univ Wisconsin Madison WI USA 53706 in, Ctr Limnol, Madison, WI 53706 USA
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
fascicolo: 9, volume: 58, anno: 2001,
pagine: 1831 - 1841
SICI:
0706-652X(200109)58:9<1831:CRAWTC>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
JOHN-DAY-RESERVOIR; SQUAWFISH PTYCHOCHEILUS-OREGONENSIS; NORTHERN SQUAWFISH; PACIFIC SALMON; SMALLMOUTH BASS; SNAKE RIVER; ONCORHYNCHUS-TSHAWYTSCHA; POPULATION VIABILITY; SURVIVAL RATES; SOCKEYE-SALMON;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Petersen, JH US Geol Survey, Western Fisheries Res Ctr, Columbia River ResLab, Cook, WA 98605 USA US Geol Survey Cook WA USA 98605 Res Lab, Cook, WA 98605 USA
Citazione:
J.H. Petersen e J.F. Kitchell, "Climate regimes and water temperature changes in the Columbia River: bioenergetic implications for predators of juvenile salmon", CAN J FISH, 58(9), 2001, pp. 1831-1841

Abstract

We examined how climatic regime shifts may have affected predation rates on juvenile Pacific salmonids (Oncorhynchus spp.) by northern squawfish (Ptychocheilus oregonensis, also called northern pikeminnow), smallmouth bass (Micropterus dolomieu), and walleye (Stizostedion vitreum) in the Columbia River. During 1933-1996, oceanic, coastal, and freshwater indices of climatewere highly correlated, and an index for the Columbia River Basin suggested that climate shifts may have occurred about 1946, 1958, 1969, and 1977. Summer water temperature varied as much as 2 degreesC between climate periods. We used a bioenergetics model for northern squawfish, the most importantpiscivore, to predict that predation on salmonids would have been 26-31% higher during two periods with relatively warm spring-summer water temperatures (1933-1946, 1978-1996) than during an extremely cold period (1947-1958). Predicted predation rates of northern squawfish were 68-96% higher in thewarmest year compared with the coldest year. Predation rates of smallmouthbass and walleye on juvenile salmonids varied among climate periods similar to rates predicted for northern squawfish. Climatic effects need to be understood in both freshwater and nearshore marine habitats, since growth rates of salmon populations are especially sensitive to mortality during earlylife stages.

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Documento generato il 01/04/20 alle ore 01:44:33