Plasticity and cross-tolerance to heterogeneous environments: divergent stress responses co-evolved in an African fruit fly

Journal of Evolutionary Biology
N GotchaCasper Nyamukondiwa

Abstract

Plastic adjustments of physiological tolerance to a particular stressor can result in fitness benefits for resistance that might manifest not only in that same environment but also be advantageous when faced with alternative environmental stressors, a phenomenon termed 'cross-tolerance'. The nature and magnitude of cross-tolerance responses can provide important insights into the underlying genetic architecture, potential constraints on or versatility of an organism's stress responses. In this study, we tested for cross-tolerance to a suite of abiotic factors that likely contribute to setting insect population dynamics and geographic range limits: heat, cold, desiccation and starvation resistance in adult Ceratitis rosa following acclimation to all these isolated individual conditions prior to stress assays. Traits of stress resistance scored included critical thermal (activity) limits, chill coma recovery time (CCRT), heat knockdown time (HKDT), desiccation and starvation resistance. In agreement with other studies, we found that acclimation to one stress typically increased resistance for that same stress experienced later in life. A more novel outcome, however, is that here we also found substantial evidence for cross-tolera...Continue Reading

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Citations

Jun 9, 2020·Journal of Evolutionary Biology·Tobias E HectorMatthew D Hall
May 28, 2020·The Journal of Experimental Biology·Nicole E MoyenMark W Denny
Jun 20, 2020·Ecology and Evolution·Dustin J Johnson, Zachary R Stahlschmidt
Jan 29, 2021·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Shelley A Adamo

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