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Titolo:
The influence of energetic requirements on the preferred temperature of overwintering juvenile Atlantic salmon (Salmo salar)
Autore:
Morgan, IJ; Metcalfe, NB;
Indirizzi:
Univ Glasgow, Inst Biomed & Life Sci, Div Environm & Evolutionary Biol, Fish Biol Grp, Glasgow G12 8QQ, Lanark, Scotland Univ Glasgow Glasgow LanarkScotland G12 8QQ ow G12 8QQ, Lanark, Scotland
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
fascicolo: 4, volume: 58, anno: 2001,
pagine: 762 - 768
SICI:
0706-652X(200104)58:4<762:TIOERO>2.0.ZU;2-F
Fonte:
ISI
Lingua:
ENG
Soggetto:
ONCORHYNCHUS-NERKA; SOCKEYE SALMON; RAINBOW-TROUT; GROWTH; SURVIVAL; WINTER; PARR; STREAM; LENGTH; RIVER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Metcalfe, NB Univ Glasgow, Inst Biomed & Life Sci, Div Environm & Evolutionary Biol, Fish Biol Grp, Graham Kerr Bldg, Glasgow G12 8QQ, Lanark, Scotland Univ Glasgow Graham Kerr Bldg Glasgow Lanark Scotland G12 8QQ
Citazione:
I.J. Morgan e N.B. Metcalfe, "The influence of energetic requirements on the preferred temperature of overwintering juvenile Atlantic salmon (Salmo salar)", CAN J FISH, 58(4), 2001, pp. 762-768

Abstract

We used a horizontal temperature gradient to investigate the effect of alternate life history strategies and nutritional state on the preferred temperature of overwintering juvenile Atlantic salmon (Salmo salar L.). Contraryto our prediction, there was no significant difference in final preferred temperature between juvenile Atlantic salmon that will migrate to sea the following spring (early migrants) and those that show reduced growth and delay migration for at least another year (delayed migrants). Both migrant groups preferentially selected relatively low temperatures (< 10 degreesC), likely owing to their low appetite and growth rates. Food deprivation resulted in a significant increase, rather than our predicted decrease, in the final preferred temperature of the juvenile Atlantic salmon of approximately 2degreesC. We suggest that this is due to the need for an increased foraging effort to offset the projected energy deficit later in the winter. The final preferred temperature of delayed migrants increased from winter to spring, as predicted, coincident with increases in natural food availability and endogenous seasonal increases in appetite and growth rates. We conclude that the preferred temperature of overwintering juvenile Atlantic salmon maybe influenced by future energetic requirements rather than the current level of energy reserves.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 23:26:33