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Feeding rate and efficiency in an apex soil predator exposed to short-term temperature changes
Basic and Applied Ecology ( IF 3.0 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.baae.2020.11.006
Divya Ramachandran , Zoë Lindo , Matthew L. Meehan

Abstract As extreme climate events become more frequent and intense, short-term temperature responses of ectothermic organisms can lead to decreased performance and survival. However, organisms may acclimate to these conditions through behavioural and physiological mechanisms as exposure time increases. We used a reciprocal temperature (16 °C and 24 °C) transplant experiment to determine how feeding rate and body size of an apex soil mite predator (Stratiolaelaps scimitus) (formerly Hypoaspis miles) consuming prey (Carpoglyphus lactis) (dried-fruit-mite) changed along a gradient of acclimation time (1, 3, and 7 days, with control). In the control treatments, mites reared at 24 °C fed more, but were smaller than mites reared at 16 °C. When transferred to new temperature conditions, predators that experienced cooling events had reduced feeding efficiencies driven by decreased feeding performance, despite an absence of metabolic costs, while under warming events, predators also had reduced feeding activity, but feeding increased with acclimation time. Yet predators lost more weight the longer they were exposed to warming, and continued to experience reduced feeding efficiencies (i.e., lack of weight gain after feeding); this result suggests increased metabolic costs at higher temperatures and provides a mechanism for community downsizing under warming. Overall, our results suggest that ectothermic predators can acclimate to warming events with increased exposure time, but both warming and cooling events decrease overall performance.

中文翻译:

暴露于短期温度变化的顶端土壤捕食者的摄食率和效率

摘要 随着极端气候事件变得更加频繁和剧烈,变温生物的短期温度响应会导致性能和存活率下降。然而,随着暴露时间的增加,生物体可能会通过行为和生理机制适应这些条件。我们使用倒数温度(16 °C 和 24 °C)移植实验来确定顶端土壤螨捕食者(Stratiolaelaps scimitus)(以前称为 Hypoaspis 英里)的摄食率和体型如何消耗猎物(Carpoglyphus lactis)(干果螨)随着适应时间的梯度变化(1、3 和 7 天,有控制)。在对照处理中,在 24 °C 饲养的螨虫喂食更多,但比在 16 °C 饲养的螨虫要小。当转移到新的温度条件时,尽管没有代谢成本,但经历过降温事件的捕食者由于摄食性能下降而降低了摄食效率,而在变暖事件下,食肉动物的摄食活动也减少了,但摄食随着适应时间的增加而增加。然而,食肉动物在变暖环境中的时间越长,体重减轻的越多,并且进食效率持续降低(即进食后体重没有增加);这一结果表明在较高温度下代谢成本增加,并提供了一种在变暖下社区缩小的机制。总的来说,我们的结果表明,变温捕食者可以随着暴露时间的增加适应变暖事件,但变暖和变冷事件都会降低整体表现。在变暖事件下,捕食者的摄食活动也减少了,但随着适应时间的推移,摄食量增加。然而,食肉动物在变暖环境中的时间越长,体重减轻的越多,并且进食效率持续降低(即进食后体重没有增加);这一结果表明在较高温度下代谢成本增加,并提供了一种在变暖下社区缩小的机制。总的来说,我们的结果表明,变温捕食者可以随着暴露时间的增加适应变暖事件,但变暖和变冷事件都会降低整体表现。在变暖事件下,捕食者的摄食活动也减少了,但随着适应时间的推移,摄食量增加。然而,食肉动物在变暖环境中的时间越长,体重减轻的越多,并且进食效率持续降低(即进食后体重没有增加);这一结果表明在较高温度下代谢成本增加,并提供了一种在变暖下社区缩小的机制。总的来说,我们的结果表明,变温捕食者可以随着暴露时间的增加适应变暖事件,但变暖和变冷事件都会降低整体表现。喂食后体重增加不足);这一结果表明在较高温度下代谢成本增加,并提供了一种在变暖下社区缩小的机制。总的来说,我们的结果表明,变温捕食者可以随着暴露时间的增加适应变暖事件,但变暖和变冷事件都会降低整体表现。喂食后体重增加不足);这一结果表明在较高温度下代谢成本增加,并提供了一种在变暖下社区缩小的机制。总的来说,我们的结果表明,变温捕食者可以随着暴露时间的增加适应变暖事件,但变暖和变冷事件都会降低整体表现。
更新日期:2021-02-01
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