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Titolo:
Energetics, cost reduction and functional consequences of fish morphology
Autore:
Pettersson, LB; Hedenstrom, A;
Indirizzi:
Dept Ecol, SE-22362 Lund, Sweden Dept Ecol Lund Sweden SE-22362Dept Ecol, SE-22362 Lund, Sweden
Titolo Testata:
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES
fascicolo: 1445, volume: 267, anno: 2000,
pagine: 759 - 764
SICI:
0962-8452(20000422)267:1445<759:ECRAFC>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIFE-HISTORY; SWIMMING SPEED; METABOLIC-RATE; DAPHNIA-PULEX; CRUCIAN CARP; PELAGIC FISH; BODY-SIZE; GROWTH; BIRDS; PLASTICITY;
Keywords:
cost reduction; swimming; foraging; standard metabolic rate; fish morphology;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Pettersson, LB Univ St Andrews, Sch Environm & Evolut Biol, Bute Bldg, St Andrews KY16 9TS, Fife, Scotland Univ St Andrews Bute Bldg St Andrews Fife Scotland KY16 9TS
Citazione:
L.B. Pettersson e A. Hedenstrom, "Energetics, cost reduction and functional consequences of fish morphology", P ROY SOC B, 267(1445), 2000, pp. 759-764

Abstract

Cost reduction strategies are often invoked as explanations when studies of adaptation fail to find predicted costs. This might seem discouraging, offering little opportunity for further investigation. In this paper, we demonstrate that cost reduction strategies can themselves be investigated by arguments from design. Recent work on inducible morphological defences has shown that hydrodynamical disadvantages (e.g. high drag) in fishes can be compensated for by standard metabolic rate (SMR) adjustments. Here, we theoretically investigate the possibilities and limitations for swimming cost compensation through SMR adjustment. We continue by modelling how intraspecificpower curve variation affects the optimal swimming velocity between food patches. Our results show that, even though SMR modifications may compensatefor hydrodynamical disadvantages, low-drag fishes will nevertheless have amarked advantage under high food abundance. The relative advantage will decrease with decreasing food levels. We also show that hydrodynamical properties of fishes can be used to predict their propensity to become foraging (or swimming) specialists. Low-drag fishes can use a broad range of swimmingvelocities without substantial increases in swimming cost, whereas the cost of deviating from the optimal swimming velocity increases markedly in high-drag fishes. The results have important implications for the evolution ofmorphological diversity in fishes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/07/20 alle ore 23:01:33