...
  • 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 >Changes in the fish community of the St Lucia estuarine system (South Africa) following Cyclone Gamede, an episodic cyclonic event
【24h】

Changes in the fish community of the St Lucia estuarine system (South Africa) following Cyclone Gamede, an episodic cyclonic event

机译：飓风Gamede飓风狂欢体系（南非）鱼群的变化伴有旋转迅速的旋风事件

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

Lake St Lucia, the largest estuarine lake system in Africa, has been closed since 2002 except for a five month period in 2007 when the mouth was breached by an episodic event, Cyclone Gamede. Mouth opening in 2007 was preceded by five years of low lake levels and hypersaline conditions, which changed the fish species composition and greatly reduced marine fish species diversity. Mouth opening in March 2007 caused the system to partially fill and marine salinities were restored, allowing recruitment of marine species. This study assessed changes in the fish community during the period 2008-2011 following mouth closure after the Cyclone Gamede breaching event. A total of 19,726 fish representing 61 species were collected using seine netting at six sites across the system during biannual sampling between 2008 and 2011. After mouth closure in August 2007, salinities increased and North Lake became hypersaline during 2009-2010. Marine species initially dominated in terms of species number, but freshwater and estuarine species became progressively more abundant, notably Oreochromis mossambicus and Ambassis ambassis. The number of species decreased from 51 in 2008 to 37 in 2011, with 22 marine and two estuarine species being lost from the system. The abundance of marine species decreased by 75% as the system became progressively more saline and the closed mouth limited recruitment to infrequent overtopping events. Changes in the fish community were largely driven by salinity changes across the three main regions of the system. Although management efforts to increase freshwater inflow from the Mfolozi estuary was successful, rapid siltation of the mouth area is a concern.
机译：非洲最大的河口湖制度湖莱西亚湖已关闭，自2002年以来已关闭，除2007年的五个月内，当嘴巴被突破的剧目发生令人兴奋的飓风Gamede时。 2007年嘴张开口初期占五年的低湖水平和盐酸盐条件，改变了鱼类成分，大大减少了海洋鱼类多样性。 2007年3月的口开口导致该系统部分填补，恢复海洋盐水，允许招募海洋物种。该研究在飓风Gamede违规事件后口腔闭合后，在2008 - 2011年期间评估了鱼群的变化。在2008年至2011年期间，在整个系统中，在整个系统的六个地点收集了29,726个鱼类，在整个系统中，在整个系统的六个地点收集了61种。在2007年8月的嘴巴闭闭后，2009 - 2010年盐水增加和北湖成为Hypersaline。海洋物种最初在物种数量方面占主导地位，但淡水和河口物种变得逐渐变得更丰富，特别是OreoChromis Mossambicus和Ambassis Ambassis。物种数量从2008年的51人降低到2011年的37次，其中22个海洋和两个雌卤素物种丢失了系统。海洋物种的丰富量减少> 75％，因为系统变得逐渐变得更加盐水，闭口有限招募以不频繁过透过事件。鱼群的变化主要受系统三个主要区域的盐度变化驱动。虽然管理努力增加来自毛绒河口的淡水流入成功，但口腔区域的快速淤积是一个问题。

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