数字农科院2.0

Temperature variability homogenized thermal responses in an ectotherm community along a European longitudinal gradient

文献类型： 外文期刊

作者： Ruining Li;Chun-sen Ma;Léna Jego;Cécile Le Lann;Joan Van Barren and Gang Ma

关键词： aphid; climate change; critical thermal limits; longitudinal gradient; thermal tolerance

期刊名称： ECOGRAPHY

ISSN： 0906-7590

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Climate change, through rising temperatures, greater variability, and more frequent extremes, is reshaping insect phenology and thermal niches, with profound effects for pest outbreaks. Predicting these impacts requires a clear understanding of species and communities’ responses across geographic gradients. We assessed thermal tolerance (CTmax, CTmin, CCRT) of three cereal aphid species Sitobion avenae, Rhopalosiphum padi, Metopolophium dirhodum from 30 populations along a 1200 km longitudinal gradient in Europe, comparing autumn and spring collections. We measured guild-level functional diversity to assess thermal trait patterns along the longitudinal gradi-ent.We tested whether 1) eastern populations experiencing greater seasonality and harsher winters exhibited broader thermal ranges, 2) autumn aphids were more cold-tolerant and less heat-tolerant than spring aphids, and 3) stronger seasonality facili-tated thermal trait convergence within the guild. Across the longitudinal gradient, autumn populations in eastern Europe exhibited broader thermal ranges, supporting the climatic variability hypothesis (CVH). In contrast, spring populations displayed a counter-gradient pattern, with stronger cold tolerance in the milder western winters, likely reffecting differences in overwintering strategies (active adults in the west versus diapausing eggs in the east). Additionally, autumn aphids were less heat-tolerant than spring individuals. Eastern communities exhibited trait convergence driven by large intraspeciffc variation, whereas western communities showed interspeciffc divergence, indicating differential environmental ffltering. Increasing climate variability may drive thermal traits homogenization (negative standardized effect size of functional diversity for all traits) in ectotherm communities. Climate change may intensify season-depen-dent physiological changes, shift eastward the geographic range of aphids overwinter-ing as active adults, and homogenize thermal niches, potentially altering pest dynamics and diminishing the effectiveness of integrated pest management strategies. Our study underscores the importance of integrating seasonal dynamics and intraspeciffc trait variations when predicting climate change responses, highlighting how changes in temperature variability – not just warming – may reshape ectotherm communities during the growing season.

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