title: Short photoperiod increases energy intake, metabolic thermogenesis and organ mass in silky starlings Sturnus sericeus.
abstract: Environmental cues play important roles in the regulation of an animal's physiology and behavior. One such cue, photoperiod, plays an important role in the seasonal acclimatization of birds. It has been demonstrated that an animal's body mass, basal metabolic rate (BMR), and energy intake, are all affected by photoperiod. The present study was designed to examine photoperiod induced changes in the body mass, metabolism and metabolic organs of the silky starling, Sturnus sericeus. Captive silky starlings increased their body mass and BMR during four weeks of acclimation to a short photoperiod. Birds acclimated to a short photoperiod also increased the mass of certain organs (liver, gizzard and small intestine), and both gross energy intake (GEI) and digestible energy intake (DEI), relative to those acclimated to a long photoperiod. Furthermore, BMR was positively correlated with body mass, liver mass, GEI and DEI. These results suggest that silky starlings increase metabolic thermogenesis when exposed to a short photoperiod by increasing their body and metabolic organ mass, and their GEI and DEI. These findings support the hypothesis that bird species from temperate climates typically display high phenotypic flexibility in thermogenic capacity.
authors.affiliation: School of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, China.
authors.forename: Jia-Qi
authors.initials: JQ
authors.lastname: Wang
authors.affiliation: School of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, China.
authors.forename: Jia-Jia
authors.initials: JJ
authors.lastname: Wang
authors.affiliation: School of Life and Environmental Sciences, Wenzhou University, Wenzhou 325035, China.
authors.forename: Xu-Jian
authors.initials: XJ
authors.lastname: Wu
authors.affiliation: 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.
authors.forename: Wei-Hong
authors.initials: WH
authors.lastname: Zheng
authors.affiliation: 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. ljs@wzu.edu.cn.
authors.forename: Jin-Song
authors.initials: JS
authors.lastname: Liu
mesh_terms: D000064:Acclimatization; D000818:Animals; D001835:Body Weight / Q000502:physiology; D002149:Energy Intake / Q000502:physiology*; D008297:Male; D009929:Organ Size / Q000502:physiology; D017440:Photoperiod; D046749:Starlings / Q000033:anatomy & histology / Q000378:metabolism* / Q000502:physiology; D022722:Thermogenesis / Q000502:physiology*
keywords: Basal metabolic rate (BMR); Body mass; Energy budget; Organ mass; Photoperiod; Silky starling; Sturnus sericeus