Baum Julia K, Myers Ransom A, Kehler Daniel G, Worm Boris, Harley Shelton J, Doherty Penny A
Department of Biology, Dalhousie University, Halifax, NS, Canada B3H 4J1.
Science. 2003 Jan 17;299(5605):389-92. doi: 10.1126/science.1079777.
Overexploitation threatens the future of many large vertebrates. In the ocean, tunas and sea turtles are current conservation concerns because of this intense pressure. The status of most shark species, in contrast, remains uncertain. Using the largest data set in the Northwest Atlantic, we show rapid large declines in large coastal and oceanic shark populations. Scalloped hammerhead, white, and thresher sharks are each estimated to have declined by over 75% in the past 15 years. Closed-area models highlight priority areas for shark conservation, and the need to consider effort reallocation and site selection if marine reserves are to benefit multiple threatened species.
过度开发威胁着许多大型脊椎动物的未来。在海洋中，金枪鱼和海龟由于这种巨大压力而成为当前的保护关注点。相比之下，大多数鲨鱼物种的状况仍不明朗。利用西北大西洋最大的数据集，我们发现大型沿海和海洋鲨鱼种群数量迅速大幅下降。据估计，在过去15年中，扇形锤头鲨、大白鲨和长尾鲨的数量各自下降了超过75%。封闭区域模型突出了鲨鱼保护的重点区域，以及如果海洋保护区要惠及多种受威胁物种，就需要考虑重新分配捕捞力量和选址的必要性。
