Plastic and evolutionary responses to heat stress in a temperate dung fly: negative correlation between basal and induced heat tolerance?

Journal of Evolutionary Biology
T EsperkWolf U Blanckenhorn

Abstract

Extreme weather events such as heat waves are becoming more frequent and intense. Populations can cope with elevated heat stress by evolving higher basal heat tolerance (evolutionary response) and/or stronger induced heat tolerance (plastic response). However, there is ongoing debate about whether basal and induced heat tolerance are negatively correlated and whether adaptive potential in heat tolerance is sufficient under ongoing climate warming. To evaluate the evolutionary potential of basal and induced heat tolerance, we performed experimental evolution on a temperate source population of the dung fly Sepsis punctum. Offspring of flies adapted to three thermal selection regimes (Hot, Cold and Reference) were subjected to acute heat stress after having been exposed to either a hot-acclimation or non-acclimation pretreatment. As different traits may respond differently to temperature stress, several physiological and life history traits were assessed. Condition dependence of the response was evaluated by exposing juveniles to different levels of developmental (food restriction/rearing density) stress. Heat knockdown times were highest, whereas acclimation effects were lowest in the Hot selection regime, indicating a negative ...Continue Reading

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Citations

Nov 24, 2017·Integrative Zoology·Luc De MeesterKristien I Brans
Apr 25, 2020·BMC Evolutionary Biology·Aoife M Leonard, Lesley T Lancaster
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Mar 20, 2018·Journal of Thermal Biology·Stephanie S BauerfeindWolf U Blanckenhorn
Jun 20, 2021·Chemosphere·Daniel González-TokmanWolf U Blanckenhorn

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