...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Estuarine Coastal and Shelf Science >Nekton community response to a large-scale Mississippi River discharge:Examining spatial and temporal response to river management
【24h】

Nekton community response to a large-scale Mississippi River discharge:Examining spatial and temporal response to river management

机译：Nekton社区对大规模密西西比河流量的响应：检查对河流管理的时空响应

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Freshwater flow is generally held to be one of the most influential factors affecting community structure and production in estuaries. In coastal Louisiana, the Caernarvon Freshwater Diversion (CFD) is managed to control freshwater discharge from the Mississippi River into Breton Sound basin. Operational since 1991, CFD has undergone several changes in management strategy including pulsed spring flooding, which was introduced in 2001. We used a 20-yr time series of fisheries-independent data to investigate how variation in freshwater inflow (i.e., pre- and post-CFD, and pre and post spring pulsing management) influences the downstream nekton community (abundance, diversity, and assemblage). Analyses of long-term data demonstrated that while there were effects from the CFD, they largely involved subtle changes in community structure. Spatially, effects were largely limited to the sites immediately downstream of the diversion and extended only occasionally to more down-estuary sites. Temporally, effects were 1) immediate (detected during spring diversion events) or 2) delayed (detected several months post-diversion). Analysis of river management found that pulsed spring-time inflow resulted in more significant changes in nekton assemblages, likely due to higher discharge rates that 1) increased marsh flooding, thus increasing marsh habitat accessibility for small resident marsh species, and 2) reduced salinity, possibly causing displacement of marine pelagic species down estuary.
机译：通常认为，淡水流量是影响河口社区结构和生产的最有影响力的因素之一。在路易斯安那州沿海地区，Caernarvon淡水改道（CFD）得以控制，以控制从密西西比河到布雷顿峡盆地的淡水排放。自1991年投入运营以来，CFD的管理策略发生了几处变化，其中包括2001年引入的脉冲春季洪水。我们使用了20年时间序列的独立于渔业的数据来研究淡水流入量（即前后）的变化情况。 -CFD以及弹簧前和后的脉动管理）会影响下游的尼康顿社区（丰富度，多样性和聚集性）。长期数据分析表明，尽管差价合约产生了影响，但它们很大程度上涉及社区结构的细微变化。在空间上，影响主要限于分流下游的位置，仅偶尔扩展到河口较下的位置。暂时而言，效果为1）立即（在春季改道事件中发现）或2）延迟（改道后数月发现）。对河流管理的分析发现，春季脉冲流入导致尼康顿组合发生更重大的变化，这可能是由于较高的流量造成的：1）沼泽潮泛滥，从而增加了小型居民沼泽物种对沼泽生境的可及性，以及2）盐度的降低，可能导致海洋中上层鱼类向河口下方位移。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号