Who bullies whom at a garden feeder? Interspecific agonistic interactions of small passerines during a cold winter

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• 作者：Katarzyna Wojczulanis-Jakubas ; Monika Kulpińska ; Piotr Minias
• 关键词：Agonistic interactions ; Feeder ; Finches ; Interspecific competition
• 刊名：Journal of Ethology
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：33
• 期：2
• 页码：159-163
• 全文大小：273 KB
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• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Zoology
  Behavioural Sciences
  Animal Ecology
  Evolutionary Biology
  Neurosciences
  
• 出版者：Springer Japan
• ISSN：1439-5444

文摘

Interspecific agonistic interactions are important selective factors for maintaining ecological niches of different species, but their outcome is difficult to predict a?priori. Here, we examined the direction and intensity of interspecific interactions in an assemblage of small passerines at a garden feeder, focussing on three finch species of various body sizes. We found that large and medium-sized birds usually initiated and won agonistic interactions with smaller species. Also, the frequency of fights increased with decreasing differences in body size between the participants. Finally, the probability of engaging in a fight increased with the number of birds at the feeder.