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Effects of Drought on Stream Insects and its Ecological Consequences

机译:干旱对流昆虫的影响及其生态后果

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Global climate change scenarios predict more frequent and extended droughts, especially in the mid-latitudes. For many stream insects, these increasing periods of drought are likely to cause local if not regional extinctions, with potentially severe consequences for stream ecosystem function. Drought is a steadily-intensifying 'ramp' disturbance that disrupts lateral, longitudinal and even vertical hydrological connectivity, depending on the spatial patterns of drying and drought severity. These hydro-logical changes affect many stream insects via impacts on refuges and water quality interacting with changes wrought by human activities. Selective extirpation of specific groups of insects during drought may alter benthic food web linkages or fundamental ecosystem processes such as organic matter breakdown. Management of flowing waters must consider these impacts, seeking to protect natural resilience (e.g. refuges) and explicitly acknowledging how drought affects aquatic insect community compositionand function. However, there is much still to learn about drought and its impacts on stream insects. For example, we lack data from long-term studies that illustrate lag effects or other repercussions of droughts. Factors affecting rates and trajectories of post-drought recovery by stream insect communities are also poorly understood, hampering assessments of resistance and resilience to this increasingly common disturbance.
机译:全球气候变化方案预测更频繁和延伸的干旱,特别是在中纬度地区。对于许多流昆虫,这些增加的干旱期间可能会导致局部灭绝,具有潜在的流动生态系统函数的严重后果。干旱是一种稳步增强的“斜坡”扰动,取决于干燥和干旱严重程度的空间模式,破坏了横向,纵向甚至垂直的水文连通性。这些水力逻辑变化通过对人类活动造成的改变的影响,通过对避难和水质的影响影响许多流昆虫。干旱期间特定昆虫组的选择性偏移可能会改变底栖食品网关或基本生态系统过程,如有机物分解。流动水域管理必须考虑这些影响,寻求保护自然复原力(例如难民),并明确承认干旱如何影响水生昆虫群体组成和职能。然而,有很大程度上仍然可以了解干旱及其对流昆虫的影响。例如,我们缺乏来自长期研究的数据,说明了滞后效果或其他干旱的影响。影响溪流昆虫社区后干旱后期回收率的因素也很清楚,妨碍对这种日益常见的骚扰的抵抗和恢复性的评估。

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