文献类型: 外文期刊
第一作者: Ma, Chun-Sen
作者: Ma, Chun-Sen;Hoffmann, Ary A.;Hoffmann, Ary A.
作者机构:
关键词: Average temperature;Climate change;Life history trait;Mild temperature;Model prediction;Temperature extreme
期刊名称:JOURNAL OF EXPERIMENTAL BIOLOGY ( 影响因子:3.312; 五年影响因子:3.828 )
ISSN:
年卷期:
页码:
收录情况: SCI
摘要: Organisms in natural environments experience diel temperature fluctuations, including sporadic extreme conditions, rather than constant temperatures. Studies based mainly on model organisms have tended to focus on responses to average temperatures or short-term heat stress, which overlooks the potential impact of daily fluctuations, including stressful daytime periods and milder night-time periods. Here, we focus on daily maximum temperatures, while holding night-time temperatures constant, to specifically investigate the effects of high temperature on demographic parameters and fitness in the English grain aphid Sitobion avenae. We then compared the observed effects of different daily maximum temperatures with predictions from constant temperature-performance expectations. Moderate daily maximum temperatures depressed aphid performance while extreme conditions had dramatic effects, even when mean temperatures were below the critical maximum. Predictions based on daily average temperature underestimated negative effects of temperature on performance by ignoring daily maximum temperature, while predictions based on daytime maximum temperatures overestimated detrimental impacts by ignoring recovery under mild night-time temperatures. Our findings suggest that daily maximum temperature will play an important role in regulating natural population dynamics and should be considered in predictions. These findings have implications for natural population dynamics, particularly when considering the expected increase in extreme temperature events under climate change.
分类号: Q-33
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