River ecosystem resilience to extreme flood events.
River ecosystem resilience to extreme flood events.
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DOI：
10.1002/ece3.4300
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发表时间：
2018-08
影响因子：
2.6
通讯作者：
Brown LE
中科院分区：
文献类型：
--
作者：
Milner AM;Picken JL;Klaar MJ;Robertson AL;Clitherow LR;Eagle L;Brown LE
洪水对河流生态系统的结构有重大影响。考虑到预计随着气候变化高强度降雨事件的增加，预计世界许多地区的重大洪水事件将增加。然而，有不确定性的影响，不同的洪水制度和洪水的时间在构建河流栖息地及其相关的生物群落的重要性。此外，由于缺乏长期数据集来评估河流生态系统对洪水的恢复力，我们对社区反应的理解受到阻碍。在这里，我们表明，在一个河流生态系统研究了30年，一个主要的冬季洪水重置无脊椎动物群落的一个社区类似于15年前存在的。该社区还没有恢复到洪水前的状态时，经常性的夏季洪水9年后重置的生态系统回到一个更早的社区。总的大型无脊椎动物密度减少了一个数量级以上的夏季洪水在冬季洪水。小型底栖无脊椎动物比大型无脊椎动物对洪水的适应能力更强，这可能是由于它们体型较小，便于更容易进入河流中的避难所。太平洋粉红鲑鱼逃逸显着影响冬季洪水时，鸡蛋正在开发中的红色，相比夏季洪水，这发生在大多数鸡蛋奠定。我们的研究结果告知一个拟议的概念模型的三种可能的响应洪水的无脊椎动物社区切换到不同的状态和对未来洪水事件的恢复力的影响。在不断变化的气候中，了解这些反应对于河流管理者减轻极端洪水影响的生物影响非常重要。
Floods have a major influence in structuring river ecosystems. Considering projected increases in high‐magnitude rainfall events with climate change, major flooding events are expected to increase in many regions of the world. However, there is uncertainty about the effect of different flooding regimes and the importance of flood timing in structuring riverine habitats and their associated biotic communities. In addition, our understanding of community response is hindered by a lack of long‐term datasets to evaluate river ecosystem resilience to flooding. Here we show that in a river ecosystem studied for 30 years, a major winter flood reset the invertebrate community to a community similar to one that existed 15 years earlier. The community had not recovered to the preflood state when recurrent summer flooding 9 years later reset the ecosystem back to an even earlier community. Total macroinvertebrate density was reduced in the winter flood by an order of magnitude more than the summer flood. Meiofaunal invertebrates were more resilient to the flooding than macroinvertebrates, possibly due to their smaller body size facilitating greater access to in‐stream refugia. Pacific pink salmon escapement was markedly affected by the winter flood when eggs were developing in redds, compared to summer flooding, which occurred before the majority of eggs were laid. Our findings inform a proposed conceptual model of three possible responses to flooding by the invertebrate community in terms of switching to different states and effects on resilience to future flooding events. In a changing climate, understanding these responses is important for river managers to mitigate the biological impacts of extreme flooding effects.
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影响因子：
30.7
作者：
Milner, Alexander M.;Robertson, Anne L.;Brown, Lee E.
通讯作者：
Brown, Lee E.
影响因子：
2.7
作者：
Ledger, Mark E.;Milner, Alexander M.
通讯作者：
Milner, Alexander M.
影响因子：
8.2
作者：
Mainstone, Chris P.
通讯作者：
Mainstone, Chris P.
DOI：
10.1139/cjfas-57-11-2319
发表时间：
2000-11-01
影响因子：
2.4
作者：
Milner, AM;Knudsen, EE;Magnusson, K
通讯作者：
Magnusson, K
影响因子：
2.6
作者：
PATERSON, M
通讯作者：
PATERSON, M