Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Eye size in birds and the timing of song at dawn

Thomas, Robert J., Szeskely, T., Cuthill, I. C., Harper, D. G. C., Newson, S. E., Frayling, T. D. and Wallis, P. D. 2002. Eye size in birds and the timing of song at dawn. Proceedings of the Royal Society B: Biological Sciences 269 (1493) , pp. 831-837. 10.1098/rspb.2001.1941

Full text not available from this repository.

Abstract

Why do different species of birds start their dawn choruses at different times? We test the hypothesis that the times at which different species start singing at dawn are related to their visual capability at low light intensities. Birds with large eyes can achieve greater pupil diameters and hence, all other things being equal, greater visual sensitivity and resolution than birds with small eyes. We estimated the maximum pupil diameter of passerine birds by measuring the diameter of the exposed eye surface, and measured the times of the first songs at dawn of songbirds present in different bird communities, and the light intensities at these times. Using phylogenetic comparative analyses, we found that songbirds with large eyes started to sing at lower light intensities (and therefore earlier) than species with smaller eyes. These relationships were stronger when differences in body size were controlled for statistically, and were consistent between two phylogenies and when species were treated as independent data points. Our results therefore provide robust support for the hypothesis that visual capability at low light levels influences the times at which birds start to sing at dawn.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: Royal Society
ISSN: 0962-8452
Last Modified: 04 Jun 2017 06:37
URI: http://orca-mwe.cf.ac.uk/id/eprint/62953

Citation Data

Cited 50 times in Google Scholar. View in Google Scholar

Cited 63 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item