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<p>Birds show sign of differences in behavior and physiology during life history states (LHSs) which reflect the adaptive strategy for continued existence. The long-distance night migratory songbirds undergo behavioral shifts during the migratory journey; from inactivity to intense activity. Here, we aim to investigate the differences in seasonal responses and the blueprint of activity and rest in different life history states (LHS) in blackheaded (<i>Emberiza melanocephala;</i>&#xa0;group 1) and redheaded Buntings (<i>Emberiza bruniceps;</i>&#xa0;group 2) that inhabit overlapping breeding and wintering grounds. Adult photosensitive buntings of both groups were acclimatized in an outdoor aviary for a week and then divided into two groups. A set of buntings remained in an outdoor aviary and their changes in body mass, body fattening, and testis growth were measured under increasing natural day length conditions (NDL). Another set of buntings was transferred in 8L: 16D (8&#xa0;h of light and 16&#xa0;h of dark) for one week followed by 13L: 11D (13&#xa0;h of light and 11&#xa0;h of dark) photoperiods until they developed night-time activity (<i>Zugunruhe</i>). The rate of induction of seasonal cycles of body mass, fat gain and testis growth under an identical inductive photoperiod was significantly faster in blackheaded buntings as compared to redheaded buntings. Buntings showed significant differences in their activity-rest pattern. This suggested that both the species of buntings had different migratory strategies to reach their appropriate breeding grounds. Overall, it can be concluded that despite being closely related, sharing breeding and overwintering grounds, the buntings differ in their migratory decisions.</p>

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A seasonal comparison of behavioral and physiological markers facilitating migratory decisions in buntings

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月6日

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  • Preeti Gupta,
  • Sayantan Sur,
  • Raj Kumar,
  • Sangeeta Rani,
  • Shalie Malik

摘要

Birds show sign of differences in behavior and physiology during life history states (LHSs) which reflect the adaptive strategy for continued existence. The long-distance night migratory songbirds undergo behavioral shifts during the migratory journey; from inactivity to intense activity. Here, we aim to investigate the differences in seasonal responses and the blueprint of activity and rest in different life history states (LHS) in blackheaded (Emberiza melanocephala; group 1) and redheaded Buntings (Emberiza bruniceps; group 2) that inhabit overlapping breeding and wintering grounds. Adult photosensitive buntings of both groups were acclimatized in an outdoor aviary for a week and then divided into two groups. A set of buntings remained in an outdoor aviary and their changes in body mass, body fattening, and testis growth were measured under increasing natural day length conditions (NDL). Another set of buntings was transferred in 8L: 16D (8 h of light and 16 h of dark) for one week followed by 13L: 11D (13 h of light and 11 h of dark) photoperiods until they developed night-time activity (Zugunruhe). The rate of induction of seasonal cycles of body mass, fat gain and testis growth under an identical inductive photoperiod was significantly faster in blackheaded buntings as compared to redheaded buntings. Buntings showed significant differences in their activity-rest pattern. This suggested that both the species of buntings had different migratory strategies to reach their appropriate breeding grounds. Overall, it can be concluded that despite being closely related, sharing breeding and overwintering grounds, the buntings differ in their migratory decisions.