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Titolo:
Interactive effects of rearing temperature and oxygen on the development of Drosophila melanogaster
Autore:
Frazier, MR; Woods, HA; Harrison, JF;
Indirizzi:
Arizona State Univ, Dept Biol, Tempe, AZ 85287 USA Arizona State Univ Tempe AZ USA 85287 niv, Dept Biol, Tempe, AZ 85287 USA
Titolo Testata:
PHYSIOLOGICAL AND BIOCHEMICAL ZOOLOGY
fascicolo: 5, volume: 74, anno: 2001,
pagine: 641 - 650
SICI:
1522-2152(200109/10)74:5<641:IEORTA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
CARBON DIOXIDE CONCENTRATIONS; ATMOSPHERIC OXYGEN; CELL-SIZE; HYPOXIA; ECTOTHERMS; PERFORMANCE; EXTINCTION; EVOLUTION; TOLERANCE; INSECTS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Frazier, MR Univ Washington, Dept Zool, Box 351800, Seattle, WA 98195 USA Univ Washington Box 351800 Seattle WA USA 98195 , WA 98195 USA
Citazione:
M.R. Frazier et al., "Interactive effects of rearing temperature and oxygen on the development of Drosophila melanogaster", PHYSIOL B Z, 74(5), 2001, pp. 641-650

Abstract

Although higher temperatures strongly stimulate ectothermic metabolic rates, they only slightly increase oxygen diffusion rates and decrease oxygen solubility. Consequently, we predicted that insect gas exchange systems would have more difficulty meeting tissue oxygen demands at higher temperatures. In this study, Drosophila melanogaster were reared from egg to adult in hyperoxic (40%), hypoxic (10%), and normoxic (21%) conditions and in temperatures ranging from 15 degrees -31.5 degreesC to examine the interactive effect of temperature and oxygen on development. Hyperoxia generally increasedmass and growth rate at higher rearing temperatures. At lower rearing temperatures, however, hyperoxia had a very small effect on mass, did not affect growth rate, and lengthened time to eclosion. Relative to normoxia, fliesreared in hypoxic conditions were generally smaller (mass and thorax length), had longer eclosion times, slower growth rates, and reduced survival. At cooler temperatures, hypoxia had relatively modest or nonsignificant effects on development, while at higher temperatures, the effects of hypoxia were large. These results suggest that higher temperatures reduce oxygen delivery capacity relative to tissue oxygen needs, which may partially explain why ectotherms are smaller when development occurs at higher temperatures.

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Documento generato il 31/03/20 alle ore 09:22:30