...
  • 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 >A proposed method for assessing the extent of the seabed significantly affected by demersal fishing in the Greater North Sea
【24h】

A proposed method for assessing the extent of the seabed significantly affected by demersal fishing in the Greater North Sea

机译：一种评估大北海深海捕鱼严重影响海床范围的拟议方法

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 widespread impact of bottom towed fishinggear on benthic species and communities has long been recognized The responses toagiven intensity of fishing disturbance can be influenced by the extent to which these species and communities are preconditioned to disturbance by natural processes, in particular waves and currents. The advent of vessel monitoring system (VMS) and models of natural disturbance enable high-resolution and large-scale comparisons of fishing and natural disturbance. VMS data were employed to estimate the trawled area per 12 km by 12 km grid cell. We then quantified natural disturbance by estimating the number of days in a year the seabed was disturbed by tides and waves. As natural disturbance acts on large spatial scales, we assumed that each natural disturbance event affects whole grid cells. Frequencies could thus be translated into an area of impact, allowing us to compare fishing with natural disturbance. We show how such comparisons can be used to estimate the extent of different seabed substrate types significantly affected by demersal fishing. A measure of the probability that fishing disturbance exceeds natural disturbance provides one metric for identifyingareas of significant trawling impact on seabed habitats and might be used to measure progress towards achieving good environmental status for sea-floor integrity within the context of the European Union's Marine Strategy Framework Directive. For more than half the seabed in the English sector of the Greater North Sea, the results suggest that disturbance attributable to demersal fishing exceeds natural disturbance based on data from the years 2006 to 2008. The imbalance between natural and fishing disturbance is greatest in muddy substrates and deep circalittoral habitats.
机译：人们早已认识到底部拖曳渔具对底栖物种和群落的广泛影响。对捕捞干扰强度的反应可能受这些物种和群落对自然过程（特别是海浪和洋流）扰动的预处理程度影响。船只监测系统（VMS）和自然干扰模型的出现使得能够对捕鱼和自然干扰进行高分辨率和大规模的比较。使用VMS数据估算每12公里乘12公里网格单元的拖网区域。然后，我们通过估算一年中潮汐和海浪干扰海床的天数来量化自然干扰。由于自然干扰作用于较大的空间尺度，因此我们假设每个自然干扰事件都会影响整个网格单元。因此，频率可以转化为影响范围，使我们可以将捕鱼与自然干扰进行比较。我们展示了如何使用这些比较来估计受深海捕鱼影响的不同海底基质类型的程度。捕捞干扰量超过自然干扰量的可能性的度量提供了一个度量标准，用于确定对海底栖息地有重大拖网影响的区域，并且可以用于衡量在欧盟海洋战略框架的背景下实现良好环境状况以实现海底完整性的进展指示。根据2006年至2008年的数据，对于大北海英语地区一半以上的海床而言，结果表明，沉水捕鱼造成的干扰超过了自然干扰。在泥泞的底物中，自然干扰和捕鱼干扰之间的失衡最大。和深的周生栖息地。

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