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Titolo:
Thermal acclimation and non-shivering thermogenesis in three species of South American rodents: a comparison between arid and mesic habitats
Autore:
Nespolo, RF; Opazo, JC; Bozinovic, F;
Indirizzi:
Pontificia Univ Catolica Chile, Fac Ciencias Biol, Dept Ecol, Santiago, Chile Pontificia Univ Catolica Chile Santiago Chile ept Ecol, Santiago, Chile
Titolo Testata:
JOURNAL OF ARID ENVIRONMENTS
fascicolo: 4, volume: 48, anno: 2001,
pagine: 581 - 590
SICI:
0140-1963(200108)48:4<581:TAANTI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MAXIMUM METABOLIC-RATE; BROWN ADIPOSE-TISSUE; NONSHIVERING THERMOGENESIS; SEASONAL THERMOGENESIS; BODY-MASS; CAPACITY; PEROMYSCUS; MICE; ADAPTATIONS; TEMPERATURE;
Keywords:
non-shivering thermogenesis; thermal acclimation; seasonality; Andes range; Phyllotis; Octodon;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
46
Recensione:
Indirizzi per estratti:
Indirizzo: Nespolo, RF Pontificia Univ Catolica Chile, Fac Ciencias Biol, Dept Ecol, Casilla 114-D, Santiago, Chile Pontificia Univ Catolica Chile Casilla 114-DSantiago Chile
Citazione:
R.F. Nespolo et al., "Thermal acclimation and non-shivering thermogenesis in three species of South American rodents: a comparison between arid and mesic habitats", J ARID ENV, 48(4), 2001, pp. 581-590

Abstract

Non-hibernating mammals that live in seasonal and and environments change their non-shivering thermogenesis (NST) capacity to maintain homeothermy. Metabolic capabilities of animals, such as NST, are considered adaptive plastic traits because they have a broad range of possible phenotypes with different ambient temperatures (i.e. the reaction norm). Consequently, we determined the reaction norm for NST in Octodon degus (Bennett, 1832; M-b = 189 g) and Phyllotis darwini (Waterhouse, 1837 - M-b = 61 g) from the mesic habitat of central Chile, and in Phyllotis xanthopygus (Waterhouse, 1837,M-b =67 g) from the high Andean plains of northern Chile, an and and seasonal habitat. Octodon degus showed a 22% increase in NST with thermal acclimation, whereas P. xanthopygus showed a 112% increase, and P. darwini showed a 117% increase in NST, being the largest change observed. These results are inagreement with our hypothesis of evolutionary inertia, which states that observed metabolic plasticity in Phyllotis species is consequence of their high Andean origin, in spite of the fact the actual habitat of P. darwini isthe less seasonal central valley of Chile. (C) 2001 Academic Press.

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Documento generato il 04/04/20 alle ore 11:58:54