...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Aquatic Living Resources >Spatio-temporal variability of fish assemblages in the Gambia Estuary (West Africa) observed by two vertical hydroacoustic methods: Moored and mobile sampling
【24h】

Spatio-temporal variability of fish assemblages in the Gambia Estuary (West Africa) observed by two vertical hydroacoustic methods: Moored and mobile sampling

机译：通过两种垂直水声方法观察到的冈比亚河口（西非）鱼群的时空变化：系泊和移动采样

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Gambia Estuary is one of the last estuaries in West Africa not to have been affected by strong environmental changes and adverse human disturbances. In order to describe the spatio-temporal change in fish biomass in this estuary, and the seasonal changes in fish size classes, five research surveys have been conducted at characteristic periods in the river's water regime and meteorological seasons. The fish assemblages were sampled by two vertical echosounding protocols: mobile surveys (zigzag transects) in the estuary and moored stations. The two sampling methods produced a similar image of the fish assemblages in terms of the distribution of total biomass and target strength distributions. Large fish aggregations were detected in the most marine area at the end of the wet season, and fish biomass increased through the dry season in the upstream zone. Fish were smaller at the beginning of the wet season and they were always larger in downstream areas.
机译：冈比亚河口是西非最后的河口之一，没有受到强烈的环境变化和不利的人为干扰的影响。为了描述该河口中鱼类生物量的时空变化以及鱼类大小类别的季节性变化，在河流水情和气象季节的特征时期进行了五项研究调查。通过两种垂直回波协议对鱼群进行采样：河口站和停泊站的移动调查（锯齿形断面）。两种采样方法在总生物量分布和目标强度分布方面产生了相似的鱼群图像。在湿季结束时，在大多数海洋区域发现了大型鱼类聚集，而在上游地区，整个干季鱼类生物量都增加了。雨季开始时鱼较小，下游地区鱼总是较大。

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