Dung beetle resistance to desiccation varies within and among populations,Physiological Entomology

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Dung beetle resistance to desiccation varies within and among populations
Physiological Entomology ( IF 1.6 ) Pub Date : 2021-05-24 , DOI: 10.1111/phen.12366
Beatrice Nervo ₁ , Angela Roggero ₁ , Dan Chamberlain ₁ , Antonio Rolando ₁ , Claudia Palestrini ₁

Affiliation

The study of desiccation resistance and its underlying traits is key to understanding species responses to changes in water availability, especially in the context of predicted increases in the frequency and severity of droughts due to climate change. We performed laboratory experiments using dung beetles, important ecosystem service providers, to investigate variations in physiological traits within species, both at population and individual levels. Desiccation resistance, water loss tolerance and water content were measured in lowland and mountain populations to investigate whether physiological traits vary (i) according to elevation across four species, and (ii) according to sex or male morphology (minor and major morphs) in two species, and if these responses were consistent across species. Our results showed that desiccation resistance of dung beetles varies both at individual and population levels. We found that desiccation resistance varied between lowland and mountain populations, but no differences were found for other traits such as water loss tolerance. Moreover, differences in individual physiological responses between females, major and minor males suggest that females were more resistant to desiccation than minors and majors, but these responses were species-dependent. Our analysis at two hierarchical levels, individual and population, emphasizes the importance of considering within-species variability in predictions of how species may respond to future climatic conditions. Predictions of the responses of species to environmental change may produce different conclusions if they rely on observations from single populations or take into account only a limited range of phenotypes per population.

中文翻译：

粪甲虫对干燥的抵抗力在种群内部和种群之间有所不同

抗旱性及其潜在性状的研究是了解物种对可用水量变化的反应的关键，特别是在预计气候变化导致干旱频率和严重程度增加的情况下。我们使用重要的生态系统服务提供者粪甲虫进行了实验室实验，以研究种群和个体水平上物种内生理特征的变化。测量低地和山区种群的抗干燥性、水分流失耐受性和含水量，以研究生理性状是否（i）根据四个物种的海拔而变化，以及（ii）根据性别或雄性形态（次要和主要morphs）在两个物种中，如果这些反应在物种之间是一致的。我们的研究结果表明，粪甲虫的抗干燥性在个体和种群水平上都存在差异。我们发现低地和山区种群之间的抗旱性不同，但在其他性状（例如耐失水性）上没有发现差异。此外，女性、成年男性和未成年男性之间个体生理反应的差异表明，女性比未成年人和未成年人更能抵抗干燥。，但这些反应是依赖于物种的。我们在个体和种群两个层次上的分析强调了在预测物种如何应对未来气候条件时考虑物种内变异性的重要性。如果物种对环境变化的反应的预测依赖于单个种群的观察或仅考虑每个种群的有限范围的表型，则它们可能会产生不同的结论。

更新日期：2021-05-24

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