Effects of developmental acclimation on fitness costs differ between two aphid species

文献类型： 外文期刊

第一作者： Cao, Jun-Yu

作者： Cao, Jun-Yu;Liu, Hui-Ping;Cao, Jun-Yu;Xing, Kun;Zhao, Fei

作者机构：

关键词： Acclimation response; Cereal aphid; Climate change; Cost; Thermal tolerance

期刊名称：JOURNAL OF THERMAL BIOLOGY （ 影响因子：2.902； 五年影响因子：3.102 ）

ISSN： 0306-4565

年卷期： 2018 年 78 卷

页码：

收录情况： SCI

摘要： Most ectotherms are able to increase their tolerance to heat stress via the acclimation response. However, there is ongoing debate about whether the acclimation response is associated with fitness costs, and what factors can affect the consequences of acclimation are still unclear. To elucidate this, we sought to determine whether fitness costs varied with acclimation conditions in two cereal aphids, Sitobion avenae and Rhopalosiphum padi. Thus, the basal and inducible thermal tolerances (maximum critical temperature [CTmax]) and fitness traits (proportion of adult emergence, adult longevity, fecundity, and population parameters) of adult aphids were measured under three conditions of developmental acclimation: 1) 22 degrees C constant temperature (no acclimation), 2) 22 degrees C + 34 degrees C for 2 h per day (low daytime temperature), and 3) 22 degrees C + 38 degrees C for 2 h per day (high daytime temperature). We found that the thermal tolerances of both species were significantly higher following developmental acclimation, where higher basal and inducible thermal tolerances were observed in R. padi than in S. avenae. Low daytime temperature acclimation conditions (34 degrees C) resulted in negligible reproductive costs and improved the intrinsic rates of population increase in both species. In contrast, substantial fitness costs were detected in both species in response to high daytime temperature acclimation (38 degrees C), especially for S. avenae. Our results indicate that the effects of acclimation conditions on fitness costs differ between the two aphid species. These findings will not only enhance our understanding of species dynamics in the context of climate change but could also potentially improve pest control efforts.

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