Seasonal trade-off between starvation resistance and cold resistance in temperate wild-caught Drosophila simulans
Source: Australian Journal of Entomology, Volume 47, Number 1, February 2008 , pp. 20-23(4)
Selection experiments with Drosophila have revealed a possible evolutionary trade-off between cold resistance and starvation resistance that may be controlled by lipid metabolism. To test this trade-off in naturally occurring Drosophila simulans populations, flies were simultaneously collected from two temperate locales experiencing contrasting seasons. Flies from a tropical locale served as a control. Cold coma recovery, starvation resistance and lipid proportion were assayed on adult males and females from each locale. Compared with the summer-collected flies from Canberra, the winter-collected flies from San Diego recovered from cold coma more quickly, were less starvation resistant and had lower lipid levels. These results support an evolutionary trade-off between cold resistance and starvation resistance. Combined, these data also suggest that differences in lipid metabolism may be an underlying mechanism for this trade-off.
Document Type: Research Article
Affiliations: 1: The Roy J. Carver Center for Comparative Genomics, Department of Biological Science, The University of Iowa, Iowa City, IA 52242, USA. 2: Ramaciotti Centre for Gene Function Analysis, School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia.
Publication date: February 1, 2008