Effects of temperature acclimation on body mass and energy budget in the Chinese bulbul Pycnonotus sinensis.
Chinese bulbuls (Pycnonotus sinensis) are small passerine birds that inhabit areas of central, southern and eastern China. Previous observations suggest that free-living individuals of this species may change their food intake in response to seasonal changes in ambient temperature. In the present study, we randomly assigned Chinese bulbuls to either a 30℃ or 10℃ group, and measured their body mass (BM), body temperature, gross energy intake (GEI), digestible energy intake (DEI), and the length and mass of their digestive tracts over 28 days of acclimation at these temperatures. As predicted, birds in the 30℃ group had lower body mass, GEI and DEI relative to those in the 10℃ group. The length and mass of the digestive tract was also lower in the 30℃ group and trends in these parameters were positively correlated with BM, GEI and DEI. These results suggest that Chinese bulbuls reduced their absolute energy demands at relatively high temperatures by decreasing their body mass, GEI and DEI, and digestive tract size.
School of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, China. ljs@wzu.edu.cn.
Yu-Nan
YN
Wu
Lin
L
Lin
Yu-Chao
YC
Xiao
Li-Meng
LM
Zhou
Meng-Si
MS
Wu
Hui-Ying
HY
Zhang
Jin-Song
JS
Liu
D000064:Acclimatization / Q000502:physiology*; D000818:Animals; D001835:Body Weight / Q000502:physiology*; D002681:China; D004063:Digestion / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology*; D041981:Gastrointestinal Tract / Q000033:anatomy & histology / Q000502:physiology; D046109:Passeriformes / Q000502:physiology*; D013696:Temperature; D013997:Time Factors
Body mass; Energy budget; Pycnonotus sinensis; Temperature acclimation