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Titolo:
Field evaluation of a bioenergetics-based foraging model for kokanee (Oncorhynchus nerka)
Autore:
Stockwell, JD; Johnson, BM;
Indirizzi:
Colorado State Univ, Dept Fishery & Wildlife Biol, Ft Collins, CO 80523 USA Colorado State Univ Ft Collins CO USA 80523 iol, Ft Collins, CO 80523 USA
Titolo Testata:
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
, volume: 56, anno: 1999, supplemento:, 1
pagine: 140 - 151
SICI:
0706-652X(1999)56:<140:FEOABF>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
JUVENILE SOCKEYE SALMON; VERTICAL MIGRATION; ALOSA-PSEUDOHARENGUS; FISH; TEMPERATURE; BEHAVIOR; ECOLOGY; SIZE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Stockwell, JD Massachusetts Div Marine Fisheries, Annisquam River Marine Fisheries Stn, 30 Emerson Ave, Gloucester, MA 01930 USA Massachusetts Div Marine Fisheries 30 Emerson Ave Gloucester MA USA 01930
Citazione:
J.D. Stockwell e B.M. Johnson, "Field evaluation of a bioenergetics-based foraging model for kokanee (Oncorhynchus nerka)", CAN J FISH, 56, 1999, pp. 140-151

Abstract

We used a bioenergetics-based foraging model to determine if bioenergetic and foraging constraints could explain kokanee (Oncorhynchus nerka) diel vertical migration in Blue Mesa Reservoir, Colorado. We compared model predictions of daily growth and migration strategies with observed growth and diel vertical distributions on three dates during the summer. Results suggest that bioenergetic and foraging constraints were not sufficient to explain diel vertical migration early in the summer, when thermal stratification wasweak. However, these constraints could explain observed patterns later in the summer, when optimal thermal habitat for kokanee was spatially segregated from food-rich surface waters. The onset of a strong thermocline, and its exclusion of piscivorous lake trout (Salvelinus namaycush) from surface waters, appeared to determine the relative importance of predation risk for kokanee diel vertical migration patterns. Our observations and modeling results suggest that the relative importance of various factors driving diel vertical migration changes seasonally. Furthermore, the relative importance of each factor likely varies from system to system and may have caused the variety of single-factor hypotheses proposed to explain kokanee diel vertical migration. The model provides a framework for studying diel vertical migration across systems of differing thermal regimes, productivity, and predation pressures.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 14:24:39