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- W2015884619 abstract "Dusky munias are small (9.5 g) tropical seed-eating members of the family Estrildidae. Adaptations of munias to hot-humid conditions were examined by measuring body temperatures (Tb), rates of oxygen consumption [V(O2)] and evaporative water loss (Mwe) at night at ambient temperatures (Ta) between 17 and 44�C. Within the zone of thermal neutrality (30-39�C) night-time Tb averaged 38.9�C (range 37.6-41.l�C). Above 30�C, Tb increased with increasing To, reaching a maximum of 44.1�C at a Ta of 43.8�C. For the most part, dusky munias were unable to maintain Tb lower than Ta at high temperatures. The mean standard metabolic rate of munias was 1.87 ml O2 g-1 h-1. This is only 51% of the value predicted for passerine birds of comparable size. Below thermal neutrality, V(O2) (in ml g-l h-1) varied with Ta (�C) in accordance with the equation V(O2) = 8.37-0.218Ta. The slope of the line relating V(O2) to Ta below thermal neutrality is 19% lower than predicted, indicating that munias are better insulated than other birds of comparable size. Dusky munias have relatively high rates of Mwe at Ta's below 34�C (mean 7.68 mg water g-1 h-1), but exhibit little capacity to increase the rate of evaporation at high Ta's. Review of metabolic data for birds reveals that the standard metabolic rate of tropical species averages 67% of the level predicted from body mass. Thus, adaptation to hot-humid climates appears to have involved a reduction in the level of metabolism." @default.
- W2015884619 created "2016-06-24" @default.
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- W2015884619 date "1977-01-01" @default.
- W2015884619 modified "2023-10-18" @default.
- W2015884619 title "Temperature regulation in the Dusky Munia, Lonchura fuscans (Cassin) (Estrildidae)" @default.
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- W2015884619 doi "https://doi.org/10.1071/zo9770193" @default.
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