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首页> 外文期刊>Conservation Biology >Putting longline bycatch of sea turtles into perspective
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Putting longline bycatch of sea turtles into perspective

机译：将海龟延绳钓的兼捕纳入视野

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Although some sea turtle populations are showing encouraging signs of recovery, others continue to decline. Reversing population declines requires an understanding of the primary factor(s) that underlie this persistent demographic trend. The list of putative factors includes direct turtle and egg harvest, egg predation, loss or degradation of nesting beach habitat, fisheries bycatch, pollution, and large-scale changes in oceanographic conditions and nutrient availability. Recently, fisheries bycatch, in particular bycatch from longline fisheries, has received increased attention and has been proposed as a primary source of turtle mortality. We reviewed the existing data on the relative impact of longline bycatch on sea turtle populations. Although bycatch rates from individual longline vessels are extremely low, the amount of gear deployed by longline vessels suggests that cumulative bycatch of turtles from older age classes is substantial. Current estimates suggest that even if pelagic longlines are not the largest single source of fisheries-related mortality, longline bycatch is high enough to warrant management actions in all fleets that encounter sea turtles. Nevertheless, preliminary data also suggest that bycatch from gillnets and trawl fisheries is equally high or higher than longline bycatch with far higher mortality rates. Until gillnet and trawl fisheries are subject to the same level of scrutiny given to pelagic longlines, our understanding of the overall impact of fisheries bycatch on vulnerable sea turtle populations will be incomplete.
机译：尽管一些海龟种群显示出令人鼓舞的复苏迹象，但其他种群却继续下降。扭转人口下降趋势需要了解构成这一持续人口趋势的主要因素。推测的因素包括海龟和卵的直接收获，卵的捕食，嵌套海滩栖息地的丧失或退化，渔业兼捕，污染以及海洋条件和养分利用率的大规模变化。最近，渔业兼捕，特别是延绳钓渔业的兼捕，受到了越来越多的关注，并被提议作为乌龟死亡率的主要来源。我们回顾了有关延绳钓兼捕对海龟种群的相对影响的现有数据。尽管个别延绳钓渔船的兼捕率极低，但延绳钓渔船部署的渔具数量表明，年龄较大的乌龟的累积兼捕渔获量很高。当前的估计表明，即使远洋延绳钓不是与渔业有关的死亡率的最大单一来源，延绳钓副渔获物也足够高，足以保证在所有遇到海龟的船队中采取管理行动。尽管如此，初步数据还表明，刺网和拖网捕捞的副渔获物比延绳钓的副渔获物同等高或更高，死亡率更高。直到刺网和拖网渔业受到对远洋延绳钓的同样程度的审查，我们对渔业兼捕对脆弱海龟种群的总体影响的理解才是完整的。

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