首页|Interspecific variation of thermoregulation between small migratory and resident passerines in Wenzhou

Interspecific variation of thermoregulation between small migratory and resident passerines in Wenzhou

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  • 国家科技期刊平台
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Physiological adaptation arises from several fundamental sources of phenotypic variation.Most analyses of metabolic adaptation in birds have focused on the basal metabolic rate (BMR),the lower limit of avian metabolic heat production.In this study,we investigated thermoregulation in three passerine species;the yellow-billed grosbeak Eophona migratoria,white-rumped munia Lonchura striata and black-throated bushtit Aegithalos concinnus,in Wenzhou,China.Metabolic rate was measured using the closed-circuit respirometer containing 3.5 L animal chambers.Body temperature (Tb) was measured during metabolic measurements using a lubricated thermocouple.The minimum thermal conductance of these species was calculated by measuring their Tb and metabolic rates.The yellow-billed grosbeak remained largely normothermic,and the white-rumped munia and black-throated bushtit exhibited variable Tb at ambient temperatures (Ta).Mean metabolic rates within thermal neutral zone were 2.48±0.09 O2 (mL)/g/h for yellow-billed grosbeaks,3.44±0.16 O2 (mL)/g/h for white-rumped munias,and 3.55±0.20 O2 (mL)/g/h for black-throated bushtits,respectively.Minimum thermal conductance of yellow-billed grosbeak,white-rumped munia and black-throated bushtit were 0.13±0.00,0.36±0.01,and 0.37±0.01 O2 (mL)/g/h/℃,respectively.The ecophysiological characteristics of these species were:(1) the yellowbilled grosbeak had relatively high Tb and BMR,a low lower critical temperature and thermal conductance,and a metabolic rate that was relatively insensitive to variation in Ta;all of which are typical of cold adapted species and explain its broader geographic distribution;(2) the white-rumped munia and blackthroated bushtit had high thermal conductance,lower critical temperature,and relatively low BMR,all which are adapted to warm environments where there is little selection pressure for metabolic thermogenesis.Taken together,these data illustrate small migratory and resident passerines that exhibit the different characteristics of thermoregulation.

Basal metabolic rateBody temperatureThermal conductanceEophona migratoriaLonchura striataAegithalos concinnus

Qing-Gang QIAO、Hong-Ji LIANG、Min-Lan BAI、Wei-Hong ZHENG、Jin-Song LIU

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School of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, China

Zhejiang Provincial Key Lab for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China

National Natural Science Foundation of ChinaNational Undergraduate "Innovation" Project and the Zhejiang Province "Xinmiao" Project

31470472

2016

10.13918/j.issn.2095-8137.2016.3.167

动物学研究
中国科学院昆明动物研究所 中国动物学会

动物学研究

CSTPCDCSCD
影响因子：0.582
ISSN：0254-5853
年,卷(期)：2016.37(3)
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