双髻鲨迁移给出了保护新希望

OLYMPUS DIGITAL CAMERA在比米尼群岛生物研究站在巴哈马科学家显示动作的激光摄影技术:指向的已知距离的两个激光器(20厘米)平行于鲨鱼。这是在其中我们可以精确地估计敏感的动物的大小,如伟大的双髻鲨一种非侵入性技术。版权所有:尤金Kitsios的比米尼生物研究站

New information on the migration patterns of the Great Hammerhead shark, Sphyrna mokarran, will help to protect this endangered species, scientists suggest.

— Abigail Pattenden

休闲渔业和鱼翅贸易双方的目标时,一眼认出大双髻鲨的全球人口估计已经由〜80%,在过去的25年中下降。

The Great Hammerhead has been listed on the IUCN (国际自然养护)自2007年起为濒危它最近也被列入CITES Appendix II,其中规定濒危物种国际贸易。

尽管承认其威胁地位,有效的保护和管理至今受到阻碍缺乏对鲨鱼的行为的信息。

然而,新的研究发表在Frontiers in Marine Science,给人一线希望。通过定义鲨鱼使用特定区域,这项研究给出了海洋管理和养护人员限制鲨鱼的能力与他们的最大威胁互动 - 人类。

Importantly, this study looked at the temporal as well as the spatial aspect of the sharks’ movements.

Dr Tristan Guttridge, who led the study at the比米尼生物研究站,巴哈马,解释了为什么这是如此重要:“知道什么时候动物很可能是在某些地方会在制定有效的管理战略至关重要。”他说。“举个例子,我们的数据可以用来创建所谓的‘时间禁渔区’,其中某些区域被关闭特定的活动,如钓鱼,在不同的时间。其目的是减少与鲨鱼”有害的相互作用。

南鲨鱼生态学集团在弗林德斯大学,澳大利亚的博士查理Huveneers,同意。“关于大锤头的运动新的信息将帮助管理者和监管,以确保可持续捕捞量,并提高国际监管和管理。”他说。“感谢的作者所使用相结合的方法,研究揭示了跨辖区复杂的运动模式,以大规模迁移北至弗吉尼亚州,美国,以及在佛罗里达和巴哈马季节性网站保真”。

与机器人的研究团队标记鲨鱼h acoustic and satellite tags, and used photo identification and laser photogrammetry. They were able to observe return-migrations of over 3000km. They also discovered that the sharks came “home” after migrating away to find food, pup or mate, and that they returned to the same sites for up to five months. This type of predictable behaviour makes them particularly vulnerable to fisheries.

“在美国休闲渔业很可能有很大的上锤头相当的影响” Guttridge解释。manbetx 手机客户端“我们知道,锤头是第三个最常见的鲨鱼报道佛罗里达休闲垂钓包船,特别巨大的锤头是由客户认为是最有吸引力的品种赶上一个”他补充说。

Migratory animals not restrained by international borders

This study is the first to provide evidence that Great Hammerheads return to particular areas after migrations, rather than the perhaps more common perception of these sharks as “ocean wanderers”. This discovery has great implications for marine management, and the development of MPAs (Marine Protected Areas).

但是,仍然存在许多挑战在确保安全的未来,这些鲨鱼。像这些高度洄游动物,管理策略将需要跨辖区和国际边界,以便有效。

“We have only just scratched the surface of defining key spatial hotspots, but clearly for these highly mobile sharks, we need international cooperation” said Dr Guttridge, “and unfortunately, sharks refuse to acknowledge national boundaries”.

The implications of the temporal aspect of migrations will also need further investigation. The sharks will be more vulnerable at different times.

“For our team, the next challenge is identifying what they are doing in these locations” said Guttridge, “as there are more sensitive life stages, such as pupping/mating sites that are a priority for conservation efforts”.

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2 Comments on Hammerhead shark migration gives new hope for conservation

  1. I think the real action is necessary to protect hammerhead sharks from extinction. The longer the Hammerhead Shark populations dwindle because of deliberate human actions Hammerhead Shark hunt for the purposes of economic or other purposes.

    Like

  2. 塔刹luckeydoo //July 25, 2017 at 12:28 am//Reply

    I know where a hammerhead shark gives birth because i have seen a pup that was only 13.5inches long. I am from fort myers florida. We were in the mangroves in fort myers beach florida. Just thought it might be of some help to you guys.

    Like

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