Present address: Nicolle A. Mode, Alaska Field Station, National Institute for Occupational Safety and Health, 4230 University Drive Suite 310, Anchorage AK 99508, USA.
Role of sexual and natural selection in evolution of body size and shape: a phylogenetic study of morphological radiation in grouse
Article first published online: 13 MAR 2006
Journal of Evolutionary Biology
Volume 19, Issue 4, pages 1083–1091, July 2006
How to Cite
DROVETSKI, S. V., ROHWER, S. and MODE, N. A. (2006), Role of sexual and natural selection in evolution of body size and shape: a phylogenetic study of morphological radiation in grouse. Journal of Evolutionary Biology, 19: 1083–1091. doi: 10.1111/j.1420-9101.2006.01097.x
- Issue published online: 13 MAR 2006
- Article first published online: 13 MAR 2006
- Received 14 August 2005; revised 12 January 2006; accepted 17 January 2006
- functional morphology;
- independent contrasts;
- mating systems;
- Rensch's rule;
- sexual size dimorphism
We use standardized independent contrasts (SICs) to elucidate the effect of ecology and mating systems on morphological radiation in grouse. The analysis of SICs for 38 skeletal measurements from 20 taxa, showed that changes in mating system had a significant effect on body size of both sexes. Sexual size dimorphism in grouse is consistent with Rensch's rule; the slope of the regression of male vs. female size SICs was 1.4, significantly >1. Changes in habitat were associated with accelerated rates of evolution of body proportions. SICs for male and female scores of size independent factors were directly proportional to each other (slope = 1), indicating extreme similarities between male and female ecology. Females, however, were better adapted to longer, more energy efficient flight than males. Size independent morphological differences among grouse are adaptive and are related to the differences in habitat and foraging behaviour among the species.