Biodiversity, productivity, and the spatial insurance hypothesis revisited

摘要: Accelerating rates of biodiversity loss have led ecologists to explore the effects species richness on ecosystem functioning and flow services. One explanation relationship between lies in spatial insurance hypothesis, which centers idea that productivity stability increase with a temporally varying, spatially heterogeneous environment. However, there has been little work impact dispersal where environmental risks are more or less correlated, variable. In this paper, we extend original Loreau model consider stochastic temporal variation resource availability, refer as "environmental risk", heterogeneity rates. We find asynchronies across communities provide community-level stabilizing productivity, despite varying levels richness. Although intermediate play role mitigating risk, they effective insuring against global (metacommunity-level) than local (individual community-level) risks. These results particularly interesting given emergence sources risk such climate change closer integration world markets. Our offer deeper insights into new perspectives effectiveness face