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Titolo:
Physiological ecology meets the ideal-free distribution: Predicting the distribution of size-structured fish populations across temperature gradients
Autore:
Hughes, NF; Grand, TC;
Indirizzi:
Simon Fraser Univ, Behav Ecol Res Grp, Burnaby, BC V5A 1S6, Canada Simon Fraser Univ Burnaby BC Canada V5A 1S6 , Burnaby, BC V5A 1S6, Canada Univ Alaska Fairbanks, Sch Fisheries & Ocean Sci, Fairbanks, AK 99775 USA Univ Alaska Fairbanks Fairbanks AK USA 99775 Sci, Fairbanks, AK 99775 USA Univ British Columbia, Dept Zool, Vancouver, BC V6T 1Z4, Canada Univ British Columbia Vancouver BC Canada V6T 1Z4 ver, BC V6T 1Z4, Canada
Titolo Testata:
ENVIRONMENTAL BIOLOGY OF FISHES
fascicolo: 3, volume: 59, anno: 2000,
pagine: 285 - 298
SICI:
0378-1909(200011)59:3<285:PEMTID>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
SALMO-TRUTTA L; JUVENILE COHO SALMON; HABITAT SELECTION; PREDATION RISK; BROWN TROUT; SOCKEYE SALMON; RATION SIZE; SPATIAL-DISTRIBUTION; UNEQUAL COMPETITORS; ONCORHYNCHUS-NERKA;
Keywords:
resource competition; foraging; habitat selection; unequal competitors; ecological energetics; size-segregation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Hughes, NF Simon Fraser Univ, Behav Ecol Res Grp, Burnaby, BC V5A 1S6, Canada Simon Fraser Univ Burnaby BC Canada V5A 1S6 BC V5A 1S6, Canada
Citazione:
N.F. Hughes e T.C. Grand, "Physiological ecology meets the ideal-free distribution: Predicting the distribution of size-structured fish populations across temperature gradients", ENV BIOL F, 59(3), 2000, pp. 285-298

Abstract

We describe a habitat selection model that predicts the distribution of size-structured groups of fish in a habitat where food availability and watertemperature vary spatially. This model is formed by combining a physiological model of fish growth with the logic of ideal free distribution (IFD) theory. In this model we assume that individuals scramble compete for resources, that relative competitive abilities of fish vary with body size, and that individuals select patches that maximize their growth rate. This model overcomes limitations in currently existing physiological and IFD-based models of habitat selection. This is because existing physiological models do not take into account the fact that the amount of food consumed by a fish ina patch will depend on the number of competitors there (something that IFDtheory addresses), while traditional IFD models do not take into account the fact that fish are likely to choose patches based on potential growth rate rather than gross food intake (something that physiological models address). Our model takes advantage of the complementary strengths of these two approaches to overcome these weaknesses. Reassuringly, our model reproducesthe predictions of its two constituent models under the simple conditions where they apply. When there is no competition for resources it mimics the physiological model of habitat selection, and when there is competition butno temperature variation between patches it mimics either the simple IFD model or the IFD model for unequal competitors. However, when there are bothcompetition and temperature differences between patches our model makes different predictions. It predicts that input-matching between the resource renewal rate and the number of fish (or competitive units) in a patch, the hallmark of IFD models, will be the exception rather than the rule. It also makes the novel prediction that temperature based size-segregation will be common, and that the strength and direction of this segregation will dependon per capita resource renewal rates and the manner in which competitive weight scales with body size. Size-segregation should become more pronouncedas per capita resource abundance falls. A larger fish/cooler water patternis predicted when competitive ability increases more slowly than maximum ration with body size, and a smaller fish/cooler water pattern is predicted when competitive ability increases more rapidly than maximum ration with body size.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 06/04/20 alle ore 01:49:08