In situ resistance, not immigration, supports invertebrate community resilience to drought intensification in a Neotropical ecosystem

While future climate scenarios predict declines in precipitations in many regions of the world, little is known of the mechanisms underlying community resilience to prolonged dry seasons, especially in “naïve” Neotropical rainforests. Predictions of community resilience to intensifying drought are complicated by the fact that the underlying mechanisms are mediated by species’ tolerance and resistance traits, as well as rescue through dispersal from source patches. We examined the contribution of in situ tolerance-resistance and immigration to community resilience, following drought events that ranged from the ambient norm to IPCC scenarios and extreme events. We used rainshelters above rainwater-filled bromeliads of French Guiana to emulate a gradient of drought intensity (from 1 to 6 times the current number of consecutive days without rainfall), and we analyzed the post-drought dynamics of the taxonomic and functional community structure of aquatic invertebrates to these treatme...未来气候情景预测全球多数区域的降水量将出现下降，但目前学界对群落抵御长期干旱的内在机制仍知之甚少，尤其是在未经长期干旱胁迫的（naïve）新热带（Neotropical）雨林中。由于群落抵御干旱加剧的内在机制受到物种耐受与抗性性状、以及源种群斑块通过扩散实现的种群救援共同调控，因此对其抗旱恢复力的预测变得更为复杂。 本研究针对从常态干旱、政府间气候变化专门委员会（Intergovernmental Panel on Climate Change，IPCC）情景下的干旱到极端干旱事件，探究了原位耐受-抗性与物种迁入对群落恢复力的贡献。 本研究在法属圭亚那的积水凤梨（bromeliads）上方搭建防雨棚，以模拟干旱强度梯度（即当前无降雨连续天数的1至6倍），并分析了水生无脊椎动物的分类与功能群落结构在干旱后的动态变化，以响应这些处理[原文此处截断]。