Zoological Studies

Vol. 58, 2019

(update: 2019.07.26)
 

Feather Evolution from Precocial to Altricial Birds

Chih-Kuan Chen1,2,*, Hao-Fen Chuang3, Siao-Man Wu4, and Wen-Hsiung Li2,5,6,*

doi:

1Department of Pathology, Keck School of Medicine, University of Southern California, Los Angeles, USA. *Correspondence: E-mail: r93b42016@gmail.com (Chen); whli@uchicago.edu (Li)
2Biodiversity Research Center, Academia Sinica, Taipei 11529, Taiwan
3Department of Veterinary Medicine, National Taiwan University, Taipei 10617, Taiwan
4Department of Earth and Environmental Sciences, Ludwig-Maximilians-Universität München, München, Germany
5The iEGG and Animal Biotechnology Center, National Chung Hsing University, Taichung 402, Taiwan
6Department of Ecology and Evolution, University of Chicago, Illinois 60637, USA


Received 30 May 2019 / Accepted 16 July 2019
Communicated by Benny K.K. Chan

Birds are the most abundant terrestrial vertebrates and their diversity is greatly shaped by the feathers. How the avian evolution is linked to the feather evolution has long been a fascinating question. Numerous excellent studies have shed light on this complex relationship by investigating the feather diversity and the underlying molecular mechanisms. However, most of them focused on adult domestic birds, and the contribution of feather diversity to environmental adaptation has not been well-studied. In this review, we described bird diversity using the traditional concept of the altricial-precocial spectrum in bird hatchlings. We combined the spectrum with the recent published avian phylogeny to profile the spectrum evolution. We then focused on the discrete diagnostic character of the spectrum, the natal down, to propose a hypothesis for the precocial-to-altricial evolution. For the underlying molecular mechanisms in feather diversity and bird evolution, we reviewed the literature and constructed the known mechanisms for feather tract definition and natal down development. Finally, we suggested some future directions for the research on the altricial-precocial divergence, which may uncover more mysteries of the relationship between natal down diversity and bird evolution.

Key words: Avian evolution, Feather, Altricial, Precocial, Development.

Citation: Chen CK, Chuang HF, Wu SM, Li WH. 2019. Feather evolution from precocial to altricial birds. Zool Stud 58:y. doi:-..