Comparisons of thermogenic features in four coexisting songbirds:Is the northward colonized White-browed Laughingthrush different?  

作　　者：Pengfei Liu Rongrong Jin Miaomiao Jiang Saiyue Zhang Yuehua Sun 

机构地区：[1]School of Life Sciences and Technology,Longdong University,Qingyang,745000,China [2]Key Laboratory of Animal Ecology and Conservation Biology,Institute of Zoology,Chinese Academy of Science,Beijing,100101,China

出　　处：《Avian Research》2023年第1期78-85,共8页鸟类学研究（英文版）

基　　金：provided by the National Natural Science Foundation of China(Grant No.32070452,32011530077)。

摘　　要：Thermogenic features are often invoked to illustrate animal’s colonization,distribution,and response to climate change.To understand why the White-browed Laughingthrush(Pterorhinus sannio)has expanded its distribution to temperate zones in recent years,we compared its thermogenic features with three species of songbirds that cooccur in its newly colonized areas.Thermogenic parameters of these four species were measured under different ambient temperatures,ranging from 0 to 40℃.The results showed that basal metabolic rate(BMR)was 44.5±3.9 mL O2/h in P.sannio,which is lower than predicted value by its body weight.This is also lower than the BMR of both its temperate congener the Plain Laughingthrush(P.davidi)and the montane,similar species Elliot’s Laughingthrush(Trochalopteron elliotii).The thermal neutral zone(TNZ)in P.sannio was 15-35℃,as compared to 10-27.5℃in P.davidi,25-30℃in T.elliotii,and 7.5-32.5℃in the Green-capped Greenfinch(Chloris sinica).Thermal conductance was lowest in P.sannio,with the minimum value lower than the predicted value based on its body weight.Our results showed that the northward-colonizing P.sannio exhibited different thermogenic characteristics compared with its coexisting species in the new habitat,even its congener P.davidi,which shared similar microhabitats to P.sannio.We suggest that researchers further explore the physiological mechanisms of birds’northward expansion.

关 键 词：COLONIZATION Evaporative water los Thermal physiology Thermal neutral zone Temperature 

分 类 号：Q958[生物学—动物学]