...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine ecology progress series >Impact and distribution of bottom trawl fishing on mud-bottom communities in the Kattegat
【24h】

Impact and distribution of bottom trawl fishing on mud-bottom communities in the Kattegat

机译：底拖网捕鱼对卡特加特邦泥底社区的影响和分布

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 Kattegat in the inner Danish waters has been trawled for at least 80 yr, but so far only few attempts have been made to quantify the trawl effort, its spatial distribution and its potential ecological impact on the benthic fauna. GIS-analyses of VMS-data from trawling in the Kattegat by both Danish (2005-2009) and Swedish (2007-2009) vessels show that 95% of all trawling occurs below 22 m depth. Most activity takes place on homogeneous benthic habitats with muddy sediment at depths below the halocline and with almost the same salinity across the entire area. Furthermore, the estimate of trawled area demonstrated that the habitats are nearly 100% impacted, and frequencies of trawling beneath 100 m depth can reach 20 events per year. Multivariate analysis of community composition could not discriminate between lightly trawled and heavily trawled areas. However, a strong habitat selectivity of the trawl activity and inter-correlation between trawl activity and depth-related community structures complicated interpretation of the results. Species with biological traits previously categorized as sensitive to physical disturbance showed higher abundance in areas with low trawl activity compared to areas with higher activity. Thus, the Kattegat has been impacted to an extent where areas with reference conditions for certain habitats below 22 m no longer exist. Consequently, it is unknown how the benthic communities would have appeared without trawl disturbance and, thus, difficult to determine the impact of continued disturbance.
机译：丹麦内陆水域的Kattegat拖网至少已有80年了，但是到目前为止，仅进行了很少的尝试来量化拖网的努力，其空间分布及其对底栖动物的潜在生态影响。丹麦（2005-2009）和瑞典（2007-2009）船只在Kattegat拖网进行的VMS数据的GIS分析表明，所有拖网的95％发生在22 m深度以下。大多数活动发生在均质底栖生境中，沉积物在盐湖线以下的深度处具有泥沙沉积，并且整个区域的盐度几乎相同。此外，对拖网区域的估计表明，栖息地受到了近100％的影响，在100 m深度以下的拖网频率每年可达到20个事件。社区组成的多变量分析不能区分轻度拖网区和重度拖网区。但是，拖网活动的强大生境选择性以及拖网活动与深度相关的群落结构之间的相互关系使结果的解释变得复杂。与拖网活动较高的地区相比，拖网活动较低的地区以前被归类为对物理干扰敏感的生物学特征的物种显示出较高的丰度。因此，卡特加特河受到了一定程度的影响，在某些条件下，某些生境低于22 m的区域不再存在。因此，尚不清楚底栖动物群落在没有拖网干扰的情况下如何出现，因此难以确定持续干扰的影响。

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