An index to track the ecological effects of drought development and recovery on riverine invertebrate communities
An index to track the ecological effects of drought development and recovery on riverine invertebrate communities
复制标题
DOI：
10.1016/j.ecolind.2017.06.058
复制
发表时间：
2017-11-01
影响因子：
6.9
通讯作者：
Wood, Paul J.
中科院分区：
文献类型：
--
作者：
Chadd, Richard P.;England, Judy A.;Wood, Paul J.
在河流中，干旱的生态影响通常会导致无脊椎动物群落结构和功能的逐渐调整，并伴随着关键栖息地的突然变化，例如潮湿的河道边缘变得脱水和干燥。本文概述了一种新的指标(干旱对无脊椎动物栖息地丧失的影响-Dehli)的发展和应用，该指数通过根据分类群与渠道干燥关键阶段的可能联系来量化干旱对河流大型无脊椎动物群落的影响。文中提供了两个案例研究，其中Dehli指数说明了干旱条件下的生态发展和随后的恢复。这些例子表明，在河流流量恢复后的几个月或几年内，持续的干旱影响。将Dehli得到的结果与已建立的大型无脊椎动物流速-反应指数(Lotic-无脊椎动物流速-反应指数)进行了比较，表明其对干旱条件更敏感。来自英格兰东南部一些河流的数据被用来校准一个统计模型，然后用来检查Dehli和LIFE对假设的多年干旱的反应。这表明不同采样季节的响应有所不同，春季模型表明由于延迟再定居而产生滞后响应，秋季模型区分栖息地丧失和流速驱动的响应。Dehli的应用及其所依据的原则可以监测干旱对河流栖息地和与短期或长期天气模式有关的无脊椎动物的影响，同时还可以确定可能需要通过河流恢复干预或修订现有抽象许可的具体地点，以提高对气候变化加剧的人为活动影响的复原力。
In rivers, the ecological effects of drought typically result in gradual adjustments of invertebrate community structure and functioning, punctuated by sudden changes as key habitats, such as wetted channel margins, become dewatered and dry. This paper outlines the development and application of a new index (Drought Effect of Habitat Loss on Invertebrates - DEHLI) to quantify the effects of drought on instream macroinvertebrate communities by assigning weights to taxa on the basis of their likely association with key stages of channel drying. Two case studies are presented, in which the DEHLI index illustrates the ecological development of drought conditions and subsequent recovery. These examples demonstrate persistent drought effects months or several years after river flows recovered. Results derived using DEHLI are compared with an established macroinvertebrate flow velocity-reactive index (Lotic-invertebrate Index for Flow Evaluation - LIFE score) and demonstrates its greater sensitivity to drought conditions. Data from a number of rivers in south east England were used to calibrate a statistical model, which was then used to examine the response of DEHLI and LIFE to a hypothetical multi-year drought. This demonstrated a difference in response between sampling seasons, with the spring model indicating a lagged response due to delayed recolonisation and the autumn model differentiating habitat loss and flow velocity-driven responses. The application of DEHLI and the principles which underlie it allow the effects of drought on instream habitats and invertebrates associated with short or long term weather patterns to be monitored, whilst also allowing the identification of specific locations where intervention via river restoration, or revision of existing abstraction licensing, may be required to increase resilience to the effect of anthropogenic activities exacerbated by climate change.