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Titolo:
Comparative tolerance of four stocks of cutthroat trout to extremes in temperature, salinity, and hypoxia
Autore:
Wagner, EJ; Arndt, RE; Brough, M;
Indirizzi:
Utah Div Wildlife Resources, Fisheries Expt Stn, Logan, UT 84321 USA Utah Div Wildlife Resources Logan UT USA 84321 t Stn, Logan, UT 84321 USA
Titolo Testata:
WESTERN NORTH AMERICAN NATURALIST
fascicolo: 4, volume: 61, anno: 2001,
pagine: 434 - 444
SICI:
1527-0904(200110)61:4<434:CTOFSO>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
CRITICAL THERMAL MAXIMA; SALMO-CLARKI; UTAH; FISH;
Keywords:
temperature; oxygen; conductivity; critical thermal maximum; Bonneville cutthroat trout; Yellowstone cutthroat trout; Snake River cutthroat trout;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
59
Recensione:
Indirizzi per estratti:
Indirizzo: Wagner, EJ Utah Div Wildlife Resources, Fisheries Expt Stn, 1465 West 200 North, Logan, UT 84321 USA Utah Div Wildlife Resources 1465 West 200 North Logan UT USA 84321
Citazione:
E.J. Wagner et al., "Comparative tolerance of four stocks of cutthroat trout to extremes in temperature, salinity, and hypoxia", WEST N AM N, 61(4), 2001, pp. 434-444

Abstract

Four stocks of cutthroat trout (Oncorhynchus clarki) were exposed to high temperature, high salinity, and low dissolved oxygen to determine inherent differences. The fish tested included 2 stocks of Bonneville cutthroat trout (O. c. utah), a lacustrine stock derived from Bear Lake and a fluvial-origin stock from southern Utah (Manning Meadow Reservoir). The other 2 stockstested were from Electric Lake (largely Yellowstone cutthroat trout, O. c.bouvieri) and Jackson Hole, Wyoming (fine-spotted Snake River cutthroat trout, O. c. subsp,). Temperature tests were either critical thermal maximum (CTM) or 96-hour trials using juveniles acclimated between 12.5 degreesC and 18.0 degreesC. Two CTM end points were temperature at first loss of equilibrium (CTMeq) and onset of spasms (CTMs). There were no significant differences in CTMeq among test fish acclimated to 18.0 degreesC, but CTMs was significantly higher for Bear Lake Bonneville (30.0 degreesC) than for Snake River (29.6 degreesC) or southern Bonneville (29.7 degreesC) stocks. With fish acclimated at 13.0 degreesC, there were no significant differences among the stocks in CTMeq or CTMs. Differences among stocks varied significantly among nine 96-hour tests. Overall, it appeared that the southern Bonneville stock had slightly better survival at warmer temperatures than other stocks, In 24-hour survival tests at high salinities, the Snake River stock had the lowest tolerance, with significant mortality occuring at 18 parts perthousand (29.5 mS (.) cm(-1) conductivity). The southern Bonneville stock had the highest tolerance, with no mortality until 22 parts per thousand (38 mS (.) cm(-1)), Bear Lake Bonneville and Electric Lake stocks had 60% and30% mortality respectively, at 21 parts per thousand (36 mS (.) cm(-1)). Hypoxia tolerance measured by resistance time, 24-hour mortality, or probit analysis (LEC50) did not differ among stocks. The 24-hour LEC50 was 2.34 mgO-2 (. ) L-1 for all stocks combined.

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Documento generato il 29/03/20 alle ore 08:52:32