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Titolo:
Metabolic consequences of behavioural hypothermia and oxygen detection in submerged overwintering frogs
Autore:
Boutilier, RG; Tattersall, GJ; Donohoe, PH;
Indirizzi:
Univ Cambridge, Dept Zool, Cambridge CB2 3EJ, England Univ Cambridge Cambridge England CB2 3EJ ool, Cambridge CB2 3EJ, England NE Ohio Univ, Coll Med, Dept Physiol, Rootstown, OH 44272 USA NE Ohio Univ Rootstown OH USA 44272 Dept Physiol, Rootstown, OH 44272 USA Univ Calif San Francisco, Dept Anesthesia, San Francisco, CA 94143 USA Univ Calif San Francisco San Francisco CA USA 94143 ancisco, CA 94143 USA Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA Univ Calif San Francisco San Francisco CA USA 94143 ancisco, CA 94143 USA
Titolo Testata:
ZOOLOGY-ANALYSIS OF COMPLEX SYSTEMS
fascicolo: 2-3, volume: 102, anno: 2000,
pagine: 111 - 119
SICI:
0944-2006(2000)102:2-3<111:MCOBHA>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
RANA-CATESBEIANA; AMPHIBIANS; HYPOXIA; TEMPERATURE; BULLFROGS; RECOVERY; EXERCISE; MUSCOSA;
Keywords:
metabolic suppression; metabolic fuels; oxygen; temperature gradients;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Boutilier, RG Univ Cambridge, Dept Zool, Downing St, Cambridge CB2 3EJ, England Univ Cambridge Downing St Cambridge England CB2 3EJ England
Citazione:
R.G. Boutilier et al., "Metabolic consequences of behavioural hypothermia and oxygen detection in submerged overwintering frogs", ZOOL-AN COM, 102(2-3), 2000, pp. 111-119

Abstract

The common frog, Rana temporaria, overwinters under the ice of frozen lakes and ponds, during which time metabolic, respiratory and behavioural adjustments act in concert to conserve metabolic fuels by promoting aerobic metabolism. Animal behaviour under the ice is poorly understood, but given thatspatial and temporal gradients for temperature and oxygen develop throughout the winter, behavioural thermoregulation may allow the selection of aerobic microenvironments that are conducive to overwintering survival. Accordingly, we have examined the thermoregulatory behaviour and metabolism of cold-submerged frogs in an experimental 'gradient chamber' designed to mimic overwintering conditions in nature. The preferred temperature of 7 degrees Cin normoxia decreases to 1.5 degrees C in severe hypoxia, and coincides: with an aerobic metabolic saving of 70-85% and a delay in the onset of a runaway lactacidosis. Following intense exercise, temperature preferences are also lowered from 6.7 degrees C to 3.6 degrees C for upwards of 7 hours in a fashion reminiscent of the 'behavioural hypothermia' response to hypoxia. Cold-submerged frogs are also able to detect isothermal variations in dissolved oxygen and spend 70% of their time at oxygen partial pressures that promote aerobic metabolism. The ability to exploit gradients of oxygen and temperature has strong ecological relevance to over-wintering since the behavioural selection of preferred microhabitats is consistent with minimising the metabolic stresses associated with either hypoxia or hypothermia and promoting survival.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/07/20 alle ore 08:12:12