Phosphoglucose isomerase genotype affects life-history traits and cold stress resistance in a Copper butterfly
Article first published online: 28 JUN 2008
© 2008 The Authors. Journal compilation © 2008 British Ecological Society
Volume 22, Issue 5, pages 887–894, October 2008
How to Cite
Karl, I., Schmitt, T. and Fischer, K. (2008), Phosphoglucose isomerase genotype affects life-history traits and cold stress resistance in a Copper butterfly. Functional Ecology, 22: 887–894. doi: 10.1111/j.1365-2435.2008.01438.x
- Issue published online: 20 SEP 2008
- Article first published online: 28 JUN 2008
- Received 28 February 2008; accepted 12 May 2008; Handling Editor: Michael Angilletta
- thermal selection;
- temperature adaptation;
- phosphoglucose isomerase;
- chill-coma recovery;
- heat-knock down
- 1Accumulating evidence suggests that the phosphoglucose isomerase (PGI) locus is under thermal selection. In the Copper butterfly Lycaena tityrus PGI allele frequencies show altitudinal variation, with a single genotype occurring in c. 90% of high-altitude animals. In low-altitude populations variation at this locus is much higher.
- 2Here, we investigate variation in life-history traits and temperature stress resistance across PGI genotypes in L. tityrus from different lowland populations reared at two temperatures (19 and 24 °C).
- 3PGI genotype significantly affected larval and pupal development time, growth rate, pupal mass and chill-coma recovery time, but had no effect on heat knock-down resistance. The latter suggests that heat and cold stress resistance are based on differential mechanisms.
- 4As expected temperature also influenced all traits under investigation, its effect being more pronounced compared to that of PGI genotype (except for pupal mass).
- 5Patterns found for the PGI genotype dominating in high-altitude populations were consistent with those found for high-altitude animals. Therefore, and because of the direct link between PGI genotype and cold stress resistance, we conclude that PGI is likely to contribute to thermal adaptation in L. tityrus.
- 6Genotypes promoting rapid development and largest body size were rather rare, suggesting weak selection on both traits and/or rather high associated costs.