Present address: School of Biological Sciences, Monash University, Clayton 3800, Vic., Australia.
Investigating latitudinal clines for life history and stress resistance traits in Drosophila simulans from eastern Australia
Article first published online: 22 SEP 2008
© 2008 The Authors. Journal Compilation © 2008 European Society For Evolutionary Biology
Journal of Evolutionary Biology
Volume 21, Issue 6, pages 1470–1479, November 2008
How to Cite
ARTHUR, A. L., WEEKS, A. R. and SGRÒ, C. M. (2008), Investigating latitudinal clines for life history and stress resistance traits in Drosophila simulans from eastern Australia. Journal of Evolutionary Biology, 21: 1470–1479. doi: 10.1111/j.1420-9101.2008.01617.x
- Issue published online: 15 OCT 2008
- Article first published online: 22 SEP 2008
- Received 8 January 2008; revised 28 July 2008; accepted 6 August 2008
- body size;
- Drosophila simulans;
- latitudinal cline;
- stress resistance
Latitudinal clines have been demonstrated for many quantitative traits in Drosophila and are assumed to be due to climatic selection. However, clinal studies are often performed in species of Drosophila that contain common cosmopolitan inversion polymorphisms that also show clinal patterns. These inversion polymorphisms may be responsible for much of the observed clinal variation. Here, we consider latitudinal clines for quantitative traits in Drosophila simulans from eastern Australia. Drosophila simulans does not contain cosmopolitan inversion polymorphisms, so allows the study of clinal selection on quantitative traits that are not confounded by associations with inversions. Body size showed a strong linear cline for both females and males. Starvation resistance exhibited a weak linear cline in females, whereas chill-coma recovery exhibited a significant nonlinear cline in females only. No clinal pattern was evident for development time, male chill-coma recovery, desiccation or heat resistance. We discuss these results with reference to the role inversion polymorphisms play in generating clines in quantitative traits of Drosophila.