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生活史特征可缓冲浮游动物中捕食者-猎物动态对热浪的影响。

Life-history traits buffer against heat wave effects on predator-prey dynamics in zooplankton.

机构信息

Aquatic Ecology, Department of Biology, Lund University, Lund, Sweden.

Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, China.

出版信息

Glob Chang Biol. 2018 Oct;24(10):4747-4757. doi: 10.1111/gcb.14371. Epub 2018 Jul 18.

Abstract

In addition to an increase in mean temperature, extreme climatic events, such as heat waves, are predicted to increase in frequency and intensity with climate change, which are likely to affect organism interactions, seasonal succession, and resting stage recruitment patterns in terrestrial as well as in aquatic ecosystems. For example, freshwater zooplankton with different life-history strategies, such as sexual or parthenogenetic reproduction, may respond differently to increased mean temperatures and rapid temperature fluctuations. Therefore, we conducted a long-term (18 months) mesocosm experiment where we evaluated the effects of increased mean temperature (4°C) and an identical energy input but delivered through temperature fluctuations, i.e., as heat waves. We show that different rotifer prey species have specific temperature requirements and use limited and species-specific temperature windows for recruiting from the sediment. On the contrary, co-occurring predatory cyclopoid copepods recruit from adult or subadult resting stages and are therefore able to respond to short-term temperature fluctuations. Hence, these different life-history strategies affect the interactions between cyclopoid copepods and rotifers by reducing the risk of a temporal mismatch in predator-prey dynamics in a climate change scenario. Thus, we conclude that predatory cyclopoid copepods with long generation time are likely to benefit from heat waves since they rapidly "wake up" even at short temperature elevations and thereby suppress fast reproducing prey populations, such as rotifers. In a broader perspective, our findings suggest that differences in life-history traits will affect predator-prey interactions, and thereby alter community dynamics, in a future climate change scenario.

摘要

除了平均温度的升高外,气候变化还预计会导致极端气候事件(如热浪)的频率和强度增加,这可能会影响陆地和水生生态系统中的生物相互作用、季节演替和休眠阶段的补充模式。例如,具有不同生活史策略的淡水浮游动物,如有性或孤雌生殖,可能会对温度升高和快速温度波动有不同的反应。因此,我们进行了一项长期(18 个月)的中观实验,评估了平均温度升高(4°C)和相同能量输入但通过温度波动传递(即热浪)的影响。我们表明,不同的轮虫猎物物种有特定的温度要求,并利用有限的和特定物种的温度窗口从沉积物中补充。相反,共存的捕食性桡足类通过成体或亚成体休眠阶段进行补充,因此能够对短期温度波动做出反应。因此,这些不同的生活史策略通过减少气候变化情景下捕食者-猎物动态中时间不匹配的风险,影响桡足类和轮虫之间的相互作用。因此,我们得出结论,具有较长世代时间的捕食性桡足类可能会受益于热浪,因为它们即使在短时间的温度升高时也能迅速“醒来”,从而抑制像轮虫这样快速繁殖的猎物种群。从更广泛的角度来看,我们的研究结果表明,生活史特征的差异将影响未来气候变化情景下的捕食者-猎物相互作用,从而改变群落动态。

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