Torpor in marsupials: Recent advances
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We report new findings about torpor in marsupials with regard to three energy demanding processes: (i) development and growth, (ii) reproduction, and (iii) rewarming. Young marsupials use torpor extensively after they develop endothermy, and torpor is generally deeper and longer than in the same individuals when they reach adult size. Adult marsupials also employ torpor during pregnancy and/or lactation to reduce energy expenditure and perhaps to store fat for later use. Moreover, to enhance the energy-conserving potential of torpor, desert marsupials bask during arousal to minimize energy costs of rewarming. We show that the functions of torpor extend beyond merely reducing energy expenditure during food shortages and that torpor can save substantial amounts of energy even during the rewarming process.
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Evaporative water loss, relative water economy and evaporative partitioning of a heterothermic marsupial, the monito del monte (Dromiciops gliroides)Withers, Philip; Cooper, Christine; Nespolo, R. (2012)We examine here evaporative water loss, economy and partitioning at ambient temperatures from 14 to 33°C for the monito delmonte (Dromiciops gliroides), a microbiotheriid marsupial found only in temperate rainforests of ...
The “minimal boundary curve for endothermy” as a predictor of heterothermy in mammals and birds: a reviewCooper, Christine; Geiser, F. (2008)According to the concept of the “minimal boundary curve for endothermy”, mammals and birds with a basal metabolic rate (BMR) that falls below the curve are obligate heterotherms and must enter torpor. We examined the ...
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