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Heat tolerance may determine activity time in coprophagic beetle species (Coleoptera:Scarabaeidae)

Insect Science 2021年第4期28卷 1076-1086页

作者： nonofo gotcha Honest Machekano Ross N.Cuthbert Casper Nyamukondiwa Department of Biological Sciences and Biotechnology Botswana International University of Science and TechnologyPalapyeBotswana GEOMAR Helmholtz-Zentrum fur Ozeanforschung KielKielGermany

Although reports have documented loss of species diversity and ecological services caused by stressful temperature changes that result from climate change,some species cope through behavioral *** temperatures and magnitudes of temperature extremes increase,animals should compensate to maintain fitness(such as through temporary behavioral shifts in activity times).Appropriate timing of activity helps avoid competition across *** coprophagic dung beetles exhibit species-specific temporal activity times,it is unknown whether temperature drives evolution of these species-specific temporal activity *** nine dung beetle species(three each of diurnal,crepuscular,and nocturnal species),we explored differences in heat stress tolerance measured as critical thermal maxima(CTmax;the highest temperature allowing activity)and heat knockdown time(HKDT;survival time under acute heat stress)across these species,and examined the results using a phylogenetically informed *** results showed that day-active species had significantly higher CTmax(diurnal>crepuscular=nocturnal species),whereas crepuscular species had higher HKDT(crepuscular>nocturnal>diurnal species).There was no correlation between heat tolerance and body size across species with distinct temporal activity,and no significant phylogenetic constraint for *** with higher CTmax did not necessarily have higher HKDT,which indicates that species may respond differently to diverse heat tolerance *** heat tolerance for diurnal beetles indicates that this trait may constrain activity time and,under high acute temperatures with climate change,species may shift activity times in more benign *** results contribute to elucidate the evolution of foraging behavior and management of coprophagic beetle ecosystem services under changing environments.

关键词： biodiversity climate change dung beetle ecosystem services thermal tolerance

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