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• W2904288834 abstract "To overwinter, insects from mild temperate areas can either enter diapause or remain active. Both strategies involve costs and benefits depending on the environment. In the first case, the emerging individuals will resist winter but have a reduced fitness because diapause entails physiological and ecological costs. In the second case, individuals need to be cold-resistant enough to withstand winter temperatures during their immature and adult stages, but could avoid diapause-associated costs. In mild temperate areas, the cost-benefit balance between the diapause and the non-diapause strategy would likely change in response to climate warming. A trade-off between these two strategies should lead to reduction of diapause expression in some populations. We explored the importance of such trade-off through the comparison of cold resistance capacities among different life stages in diapause and non-diapause individuals in a population of the aphid parasitoid Aphidius ervi (Hymenoptera: Braconidae) originating from western France where a decrease of diapause incidence was recently observed. As a proxy measure of insect physiological cold resistance, the Super Cooling Point (SCP) was determined for non-diapausing and diapausing prepupae and adults that went through prepupal diapause or not. Diapausing and non-diapausing prepupae were equally cold-resistant (-24.20 ±0.30°C vs. -24.74 ±0.36°C, respectively), and overall more resistant than adults. Adults that went through diapause as prepupae were less cold resistant (-17.85 ±1.10°C) than adults that have not undergone through diapause (-21.10 ±0.54°C). We also found that diapausing prepupae and adults that have undergone diapause were lighter than their non-diapausing counterparts, at a comparable size, suggesting higher energetic expenses during diapause. These results suggest a trade-off between diapause expression in prepupae and cold resistance and life-history-traits in adults. We conclude that selection could favor insects that do not enter diapause and thus avoid its associated costs while taking advantage at exploiting the mild winter environment." @default.
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• W2904288834 date "2018-12-08" @default.
• W2904288834 modified "2023-10-02" @default.
• W2904288834 title "Effect of diapause on cold-resistance in different life-stages of an aphid parasitoid wasp" @default.
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• W2904288834 doi "https://doi.org/10.1101/489427" @default.
• W2904288834 hasPublicationYear "2018" @default.
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