Legacy effects and memory loss: how contingencies moderate the response of rocky intertidal biofilms to present and past extreme events
Legacy effects and memory loss: how contingencies moderate the response of rocky intertidal biofilms to present and past extreme events
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遗留效应和记忆丧失：突发事件如何调节岩石潮间带生物膜对当前和过去极端事件的反应
DOI：
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发表时间：
2017
影响因子：
11.6
通讯作者：
L. Benedetti‐Cecchi
中科院分区：
文献类型：
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作者：
M. Dal Bello;L. Rindi;L. Benedetti‐Cecchi
了解历史进程如何调节生态系统对扰动的反应变得越来越重要。与预测未来气候情景下生物多样性和生态系统功能的兴趣日益增长相反，历史条件下的遗留效应如何驱动生态系统的变化在很大程度上仍未得到探索。使用实验与随机前期建模相结合，我们评估了极端变暖，沉积物沉积和放牧事件如何调制的生态记忆的岩石潮间带石表微植物底栖生物（EMPB）。我们发现记忆效应在非集群的干扰情况下（相隔60天），EMPB生物量随时间波动，但在集群干扰下（相隔15天），EMPB生物量一直很低。在第二轮实验中，大规模的放牧事件影响了EMPB生物量，也使生态记忆消失。我们的研究结果为随机波动促进生态记忆的理论预期提供了实证支持，但也表明突发事件可能导致记忆丧失。
Understanding how historical processes modulate the response of ecosystems to perturbations is becoming increasingly important. In contrast to the growing interest in projecting biodiversity and ecosystem functioning under future climate scenarios, how legacy effects originating from historical conditions drive change in ecosystems remains largely unexplored. Using experiments in combination with stochastic antecedent modelling, we evaluated how extreme warming, sediment deposition and grazing events modulated the ecological memory of rocky intertidal epilithic microphytobenthos (EMPB). We found memory effects in the non‐clustered scenario of disturbance (60 days apart), where EMPB biomass fluctuated in time, but not under clustered disturbances (15 days apart), where EMPB biomass was consistently low. A massive grazing event impacted on EMPB biomass in a second run of the experiment, also muting ecological memory. Our results provide empirical support to the theoretical expectation that stochastic fluctuations promote ecological memory, but also show that contingencies may lead to memory loss.