当前位置: X-MOL 学术Evol. Ecol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Across-stage consequences of thermal stress have trait-specific effects and limited fitness costs in the harlequin ladybird, Harmonia axyridis
Evolutionary Ecology ( IF 1.9 ) Pub Date : 2020-04-30 , DOI: 10.1007/s10682-020-10045-1
Rebecca Shinner , John S. Terblanche , Susana Clusella-Trullas

The fitness consequences of thermal plasticity of functional traits of insects, and the life stages at which these responses manifest, remain a subject of much debate. Here, we examine whether a short-term exposure to cold, medium or warm fluctuating temperature regimes during development (larval or adult) affects adult performance, thermal tolerance and fitness of the globally invasive harlequin ladybird Harmonia axyridis. We found plastic responses of a metric of heat stress resistance—critical thermal maximum—and of preferred body temperature after adult temperature exposure, but not in other traits measured. By contrast, exposure of larval stages resulted in plasticity of adult walking performance (height and breadth of the curve) but not tolerance or preference. We found distinct fitness responses between larval and adult treatments, but a composite fitness index revealed negligible effects on reproductive output. These results suggest that the drivers underlying the plasticity of temperature tolerance and temperature selection are different to those shaping the plasticity of walking speed. By testing specific predictions based on current theory of developmental and reversible plasticity, this study contributes novel data to plastic responses of behaviour, stress resistance and fitness to temperature exposure across life stages and thus, provides insights to the broader evolutionary and ecological significance of these responses.

中文翻译:

热应激的跨阶段后果对丑角瓢虫 Harmonia axyridis 具有特征特异性影响和有限的健康成本

昆虫功能性状的热可塑性的适应性后果,以及这些反应表现出的生命阶段,仍然是一个备受争议的话题。在这里,我们研究了在发育(幼虫或成虫)期间短期暴露于寒冷、中等或温暖的波动温度制度是否会影响全球入侵的丑角瓢虫 Harmonia axyridis 的成年表现、热耐受性和适应性。我们发现了热应激耐受性指标(临界热最大值)和成人温度暴露后首选体温的塑性响应,但在其他测量特征中没有发现。相比之下,幼虫阶段的暴露导致成虫行走性能(曲线的高度和宽度)的可塑性,但不会导致耐受性或偏好。我们发现幼虫和成虫治疗之间存在明显的适应性反应,但综合适应度指数显示对生殖输出的影响可以忽略不计。这些结果表明,温度耐受性和温度选择的可塑性背后的驱动因素与塑造步行速度可塑性的驱动因素不同。通过测试基于当前发育和可逆可塑性理论的特定预测,本研究为行为、抗压性和对温度暴露的适应性在整个生命阶段的可塑性反应提供了新的数据,从而为这些反应的更广泛的进化和生态意义提供了见解.
更新日期:2020-04-30
down
wechat
bug