...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fisheries Research >Fishing effects in northeast Atlantic shelf seas: patterns in fishingeffort, diversity and community structure. III. International trawlingeffort in the North Sea: an analysis of spatial and temporal trends
【24h】

Fishing effects in northeast Atlantic shelf seas: patterns in fishingeffort, diversity and community structure. III. International trawlingeffort in the North Sea: an analysis of spatial and temporal trends

机译：东北大西洋陆架海的捕鱼影响：捕鱼量，多样性和群落结构的模式。三，北海国际拖网捕捞努力：时空趋势分析

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

This paper describes trends in beam and otter trawling effort in the North Sea from 1977 to 1995, Data are presented as total hours fishing by English, German, Norwegian, Scottish and Welsh vessels for the period 1977-1995, and by Danish, Dutch, English, German, Norwegian, Scottish and Welsh vessels for the period 1990-1995. Analyses of temporal trends indicated that total international trawling effort in the entire North Sea has increased slowly since 1977 and that it is currently (1995) 2.25 million h yr(-1) of which 55% is due to beam trawling, Spatial analyses indicate that the proportion of beam trawling effort increases from north to south. Plots of annual fishing effort by ICES statistical rectangle (211 boxes of 0.5 degrees latitude x 1 degrees longitude) indicate that the majority of fishing effort in the North Sea are concentrated in a very few rectangles. Thus mean annual total fishing effort (1990-1995) was less than 2 000 h in 29% of rectangles and less than 10 000 h in 66% of rectangles. Total effort exceeded 40 000 h in 4% of rectangles, The results indicate that assessments of the average area swept by trawls in the North Sea give a poor indication of the direct impacts of trawling on the biota. Some areas are intensively fished but many others are not. Our dataset is likely to underestimate trawling effort in the southern North Sea (ICES Area IVc) because data for Belgian and French vessels were not available. However, the absence of French and Belgian data would not significantly alter total trawling effort estimates from the central (IVb) and northern (IVa) North Sea. Crown copyright (C) 1999 Published by Elsevier Science B.V. All rights reserved. [References: 23]
机译：本文描述了1977年至1995年北海拖网和水獭拖网工作的趋势，数据表示为1977-1995年间英国，德国，挪威，苏格兰和威尔士船只以及丹麦，荷兰人， 1990年至1995年期间的英国，德国，挪威，苏格兰和威尔士船只。对时间趋势的分析表明，自1977年以来，整个北海的总国际拖网作业量增长缓慢，目前（1995年）为225万h yr（-1），其中55％是由于束拖网作业，空间分析表明，拖网牵引力的比例从北向南增加。通过ICES统计矩形（211个框，纬度0.5度x 1度）对年度捕捞量作图，表明北海的大部分捕捞量集中在很少的矩形上。因此，在29％的矩形中，年平均总捕捞努力（1990-1995年）少于2000小时，而在66％的矩形中，少于10000小时。在4％的矩形中，总工作量超过了40 000 h。结果表明，对北海拖网拖网平均面积的评估不能很好地说明拖网对生物群系的直接影响。有些地区是密集捕捞区，而另一些则没有。我们的数据集可能低估了北海南部（ICES IVc区）的拖网作业，因为没有比利时和法国船只的数据。但是，缺少法国和比利时的数据不会明显改变北海中部（IVb）和北海（IVa）的拖网作业总估算值。官方版权（C）1999，由Elsevier Science B.V.保留所有权利。 [参考：23]

著录项

相似文献

  • 外文文献
  • 中文文献
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