Ventilation and oxygen consumption in rosy finches and house finches at sea level and high altitude期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Ventilation and oxygen consumption in rosy finches and house finches at sea level and high altitude

Authors:	Daniel T Clemens

Institution:	(1) Department of Biology, University of California, 90024 Los Angeles, California, USA

Abstract:	Summary Rosy finches (Leucosticte arctoa) breed at altitudes above 3500 m in eastern California. House finches (Carpodacus mexicanus) belong to the same subfamily (Carduelinae), but breed at much lower elevations. Oxygen consumption ( $\dot V_{O_2 }$ ) and ventilatory parameters of these two species were measured over a wide range of ambient temperatures (T _a) at low altitude (LA; 150 m) and at high altitude (HA; 3800 m).Minimal nighttime $\dot V_{O_2 }$ 's of rosy finches and house finches at LA (T _a=30°C) were close to allometrically predicted values for passerine birds. At both altitudes, $\dot V_{O_2 }$ increased linearly with decreasingT _a betweenT _a=20 and –10°C. Resting $\dot V_{O_2 }$ 's were slightly higher at HA than at LA on average.In both species, minute volume ( $\dot VI$ ) was inversely related toT _a.T _a-correlated increases in $\dot VI$ resulted from significant increases in both ventilatory frequency (f) and tidal volume (V T) at both altitudes. Oxygen extraction efficiency ( $E_{O_2 }$ ) was independent ofT _a in rosy finches at LA, but declined significantly with decreasingT _a in rosy finches at HA and in house finches at both altitudes.At a givenT _a, both species had significantly greater $\dot VI$ (BTPS) at HA than at LA. Altitude-correlated increases in $\dot VI$ resulted primarly from increases inf with little change inV T. $E_{O_2 }$ was significantly greater at HA than at LA in both species.In spite of the difference in altitudinal distributions of rosy finches and house finches, there were few conspicuous interspecific differences in metabolic or ventilatory adaptation to altitude or lowT _a over the range of conditions examined.Symbols and abbreviations BMR basal metabolic rate - BTPS at body temperature and pressure, saturated - $E_{O_2 }$ oxygen extraction efficiency - f ventilation frequency - h mean coefficient of heat transfer - HA high altitude - $i\dot V_{O_2 }$ instantaneous oxygen consumption - LA low altitude - RH relative humidity - SMR standard metabolic rate - STPD standard temperature and pressure, dry - T temperature - a ambient - b body - lc lower critical of thermoneutral zone - $\dot VI$ minute volume - V T tidal volume

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