...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ICES Journal of Marine Science >Long-term shift in coastal fish communities before and after the collapse of Atlantic cod (Gadus morhua)
【24h】

Long-term shift in coastal fish communities before and after the collapse of Atlantic cod (Gadus morhua)

机译：大西洋鳕（Gadus morhua）崩溃前后沿海鱼类群落的长期变化

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

The collapse of the Northwest Atlantic cod (Gadus morhua) stocks in the early 1990s led to widespread ecological changes offshore. Changes in coastal fish communities are less known, largely due to the lack of historical records and long-term, standardized research surveys in coastal ecosystems. We aimed to overcome this with a unique dataset known as the Fleming survey. From 1959 to 1964, a systematic beach-seine survey was conducted to examine juvenile cod abundance in 84 bays (42 of which were consistently sampled and therefore analysed) along the east coast of Newfoundland. In addition to cod, all other fish collected in the seines were recorded. These surveys were repeated from 1992 to 1996 after the cod collapse, and document a substantial reduction in a dominant inshore species-juvenile Atlantic cod. We show that total fish abundance declined significantly with the decrease of cod, whereas Shannon diversity and species evenness significantly increased. Species richness increased in some regions but decreased in others. We also found significant changes in the composition of the fish community likely due to a combination of release from predation from fewer large cod feeding in inshore areas as well as a release from competition from fewer juvenile cod occupying the coastal habitat. Region and the presence of vegetated habitats also significantly influenced the fish community. This study shows a strong reorganization of coastal fish communities after a large-scale fisheries collapse with implications for ecosystem-based and cross-ecosystem management.
机译：1990年代初，西北大西洋鳕鱼种群数量暴跌，导致了近海广泛的生态变化。沿海鱼类群落的变化鲜为人知，主要是由于缺乏历史记录和沿海生态系统的长期，标准化研究调查。我们旨在通过称为Fleming调查的独特数据集来克服这一问题。从1959年到1964年，进行了系统的海滩围网调查，以检查纽芬兰东部沿海84个海湾（其中42个一直进行采样并因此进行了分析）中的鳕鱼数量。除鳕鱼外，还记录了围网捕捞的所有其他鱼类。从鳕鱼倒塌后的1992年至1996年，重复了这些调查，并记录了主要的近岸物种-大西洋鳕鱼的大量减少。我们发现，随着鳕鱼数量的减少，总鱼的丰度显着下降，而香农的多样性和物种均匀度显着提高。一些地区的物种丰富度增加，而另一些地区则减少。我们还发现，鱼类群落组成发生了重大变化，这可能是由于沿海地区较少的大型鳕鱼取食导致捕食释放以及沿海地区栖息的较少的鳕鱼竞争释放所致。区域和植被栖息地的存在也极大地影响了鱼类群落。这项研究表明，在大规模渔业崩溃之后，沿海鱼类群落发生了强烈的重组，这对基于生态系统和跨生态系统的管理产生了影响。

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