Colour morphs in the collared pygmy Owl glaucidium brodiei are age-related, not a polymorphism

Wen Loung Lin, Si Min Lin, Hui Yun Tseng

研究成果: 雜誌貢獻文章同行評審

5 引文 斯高帕斯(Scopus)


Colour morph variation is widely observed in owls and several studies have described differences In life history traits among the morphs. Traditionally, Glaucidium owls are described as having two colour morphs, rufous and grey, which are supposedly independent of age or sex. During 2010-2012, nest boxes were set up in order to study the basic life history of Collared Pygmy Owls Glaucidium brodiei. We banded the population and followed some of the fledglings for nearly two years. Our results-in combination with data from museum specimens-clearly show that the colour morph In Collared Pygmy Owls is age-dependent, changing from the original fledgling plumage (2-3 months after hatching) to the rufous morph (4-7 months after hatching), and finally to the definitive grey plumage. Our results reject the long-standing polymorphism hypothesis for the pygmy owl. We conclude that the age of the birds should be considered before a colour polymorphism can be confirmed, especially in secretive nocturnal species. The case of within-species polymorphism might be overstated in Strigiformes.

頁(從 - 到)95-99
出版狀態已發佈 - 2014 七月

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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