...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine and Coastal Fisheries >Using Observed Interactions between Sea Turtles and Commercial Bottom-Trawling Vessels to Evaluate the Conservation Value of Trawl Gear Modifications
【24h】

Using Observed Interactions between Sea Turtles and Commercial Bottom-Trawling Vessels to Evaluate the Conservation Value of Trawl Gear Modifications

机译：使用观察到的海龟与商业底拖网渔船之间的相互作用来评估拖网渔具改装的保护价值

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

摘要

The bycatch of sea turtles (order Testudines) in bottom-trawl fisheries is an important conservation issue currently being addressed by the U.S. National Marine Fisheries Service and its stakeholders. The agency is considering the implementation of new sea turtle conservation regulations in several mid-Atlantic trawl fisheries, including the expanded use of turtle excluder devices (TEDs). The characteristics of observed sea turtle bycatch are used to calculate four conservation metrics. The lowest-level metric is simple to calculate but not informative of population impacts because it does not adequately incorporate the magnitude and demographics of the affected population. The highest-level metric incorporates both magnitude and demographics and is therefore more difficult to calculate but also more informative. Five size categories of turtles were evaluated with respect to the protection afforded by various TED configurations, and the conservation value of 12 bycatch mitigation alternatives was estimated using each of the four conservation metrics. The most informative metric was adult-equivalent bycatch mortality. A TED with a large escape opening had the highest estimated conservation value for loggerheads Caretta caretta. Up to 66 more adult-equivalent loggerheads were estimated to be protected by the large opening than by the standard opening. A similar number could be protected by extending TED use north of 37°N. The number of adult-equivalent loggerheads estimated to be protected by standard and wide-bar spacing is nearly the same. The percentage of encountered turtles caught in trawls is not an adequate proxy for the number of adult-equivalent mortalities caused by the fishery. Evaluating sea turtle bycatch using adult-equivalent mortalities facilitates comparisons across disparate bycatch mitigation alternatives and provides a meaningful way to assess the efficacy of bycatch mitigation alternatives for the recovery of sea turtle populations.
机译：底拖网渔业中海龟的副渔获物（睾丸目）是美国国家海洋渔业局及其利益相关者目前正在解决的重要保护问题。该机构正在考虑在大西洋中部的多个拖网渔业中实施新的海龟养护规定，包括扩大使用海龟排除装置（TED）。观察到的海龟兼捕的特征用于计算四个养护指标。最低级别的指标很容易计算，但无法提供有关人口影响的信息，因为它没有充分考虑受影响人口的数量和人口统计信息。最高级别的指标同时包含了数量级和人口统计信息，因此较难计算，但也更具参考价值。根据各种TED配置提供的保护，对5种大小的海龟进行了评估，并使用这4种保护指标中的每一种估算了12种兼捕缓解措施的保护价值。最有用的指标是成年当量兼捕的死亡率。带有较大逃生开口的TED对高头Car Caretta caretta的保护价值最高。据估计，大开口比标准开口保护着多达66个成年当量的黑头logger。通过将TED的使用范围扩展到37°N以北，可以保护类似的数量。估计受标准和宽条间距保护的成年对等记录头的数量几乎相同。遇到拖网捕捞的海龟百分比不足以替代由渔业造成的成年同等死亡率。使用成年当量死亡率评估海龟兼捕，有助于比较不同的兼捕缓解措施，并提供一种有意义的方式来评估兼捕缓解措施对恢复海龟种群的功效。

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