Local adaptation to seasonal cues at the fronts of two parallel, climate‐induced butterfly range expansions

Autor: Mats Ittonen, Alexandra Hagelin, Christer Wiklund, Karl Gotthard
Rok vydání: 2022
Předmět:
Zdroj: Ecology Letters. 25:2022-2033
ISSN: 1461-0248
1461-023X
DOI: 10.1111/ele.14085
Popis: Climate change allows species to expand polewards, but non-changing environmental features may limit expansions. Daylength is unaffected by climate and drives life cycle timing in many animals and plants. Because daylength varies over latitudes, poleward-expanding populations must adapt to new daylength conditions. We studied local adaptation to daylength in the butterfly Lasiommata megera, which is expanding northwards along several routes in Europe. Using common garden laboratory experiments with controlled daylengths, we compared diapause induction between populations from the southern-Swedish core range and recently established marginal populations from two independent expansion fronts in Sweden. Caterpillars from the northern populations entered diapause in clearly longer daylengths than those from southern populations, with the exception of caterpillars from one geographically isolated population. The northern populations have repeatedly and rapidly adapted to their local daylengths, indicating that the common use of daylength as seasonal cue need not strongly limit climate-induced insect range expansions.
Databáze: OpenAIRE
Externí odkaz: