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Titolo:
Foraging energetics of arctic cormorants and the evolution of diving birds
Autore:
Gremillet, D; Wanless, S; Carss, DN; Linton, D; Harris, MP; Speakman, JR; Le Maho, Y;
Indirizzi:
NERC, Ctr Ecol & Hydrol, Banchory AB31 4BW, Kincardine, Scotland NERC Banchory Kincardine Scotland AB31 4BW AB31 4BW, Kincardine, Scotland CNRS, Ctr Ecol & Physiol Energet, F-67087 Strasbourg, France CNRS Strasbourg France F-67087 ysiol Energet, F-67087 Strasbourg, France Univ Aberdeen, Dept Zool, Aberdeen Ctr Energy Regulat & Obes, Aberdeen AB24 2TZ, Scotland Univ Aberdeen Aberdeen Scotland AB24 2TZ es, Aberdeen AB24 2TZ, Scotland
Titolo Testata:
ECOLOGY LETTERS
fascicolo: 3, volume: 4, anno: 2001,
pagine: 180 - 184
SICI:
1461-023X(200105)4:3<180:FEOACA>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
PHALACROCORAX-CARBO-CARBO; GREAT CORMORANTS; FOOD-INTAKE; TEMPERATURE; MAMMALS; SHAGS;
Keywords:
diving endotherms; energetics; foraging ecology; seabirds; cormorants; Hesperornis; thermoregulation; vertebrate evolution; polar ecosystems;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Gremillet, D NERC, Ctr Ecol & Hydrol, Hill Brathens, Banchory AB31 4BW, Kincardine, Scotland NERC Hill Brathens Banchory Kincardine Scotland AB31 4BWland
Citazione:
D. Gremillet et al., "Foraging energetics of arctic cormorants and the evolution of diving birds", ECOL LETT, 4(3), 2001, pp. 180-184

Abstract

Efficient body insulation is assumed to have enabled birds and mammals to colonize polar aquatic ecosystems. We challenge this concept by comparing the bioenergetics of cormorants (Phalamocorax carbo) living in temperate andarctic conditions. We show that although these birds have limited insulation, they maintain high body temperature (42.3 degreesC) when diving in coldwater (1-10 degreesC). Their energy demand at these times is extremely high (up to 60 W kg(-1)). Free-living cormorants wintering in Greenland (watertemperature -1 degreesC) profoundly alter their foraging activity, thus minimizing time spent in water and the associated high thermoregulatory costs. They then meet their daily food demand within a single intense dive bout (lasting 9 min on average). Their substantial energy requirements are balanced by the highest predatory efficiency so far recorded for aquatic predators. We postulate that similar behavioural patterns allowed early diving birds (Cretaceous) to colonize cold coastal areas before they evolved efficient insulation.

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Documento generato il 28/03/20 alle ore 10:02:50