Synchrony and Stability of Food Webs in Metacommunities
Synchrony and Stability of Food Webs in Metacommunities
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DOI：
10.1086/649579
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发表时间：
2010-02-01
影响因子：
2.9
通讯作者：
Gonzalez, Andrew
中科院分区：
文献类型：
--
作者：
Gouhier, Tarik C.;Guichard, Frederic;Gonzalez, Andrew
同步性对地方和区域尺度上食物网的持久性和稳定性具有根本性但相互矛盾的影响。在一个恒定的环境中，物种之间的补偿动态可以维持食物网的稳定，但在社区内和社区之间同步人口波动的因素预计是不稳定的。我们研究了一个食物网的动力学在metacompatibility，以确定环境的变化和扩散如何影响稳定性，通过改变补偿动态和平均物种丰度。当扩散率较高时，弱相关的环境波动通过降低补偿动力学的振幅来促进食物网的稳定性。然而，当扩散率低，弱的环境波动降低食物网的稳定性，诱导种内同步跨社区。无论扩散率，强烈的环境波动破坏补偿动力学和稳定性降低诱导消费者之间的间歇性相关波动，在当地的食物网，减少总消费者丰度和捕食者丰度。强相关的环境波动导致（一）空间异步和高度相关的本地消费者动态时，分散是低和（ii）空间同步，但中间本地消费者的相关性时，分散是高的。通过控制种内同步，分散介导的能力，强烈的环境波动破坏补偿动力学在本地和metacompatibility尺度。
Synchrony has fundamental but conflicting implications for the persistence and stability of food webs at local and regional scales. In a constant environment, compensatory dynamics between species can maintain food web stability, but factors that synchronize population fluctuations within and between communities are expected to be destabilizing. We studied the dynamics of a food web in a metacommunity to determine how environmental variability and dispersal affect stability by altering compensatory dynamics and average species abundance. When dispersal rate is high, weak correlated environmental fluctuations promote food web stability by reducing the amplitude of compensatory dynamics. However, when dispersal rate is low, weak environmental fluctuations reduce food web stability by inducing intraspecific synchrony across communities. Irrespective of dispersal rate, strong environmental fluctuations disrupt compensatory dynamics and decrease stability by inducing intermittent correlated fluctuations between consumers in local food webs, which reduce both total consumer abundance and predator abundance. Strong correlated environmental fluctuations lead to (i) spatially asynchronous and highly correlated local consumer dynamics when dispersal is low and (ii) spatially synchronous but intermediate local consumer correlation when dispersal is high. By controlling intraspecific synchrony, dispersal mediates the capacity of strong environmental fluctuations to disrupt compensatory dynamics at both local and metacommunity scales.