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首页> 外文期刊>Chelonian conservation and biology >Assessment of Important Marine Turtle Nesting Populations on the Southern Coast of Bioko Island, Equatorial Guinea
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Assessment of Important Marine Turtle Nesting Populations on the Southern Coast of Bioko Island, Equatorial Guinea

机译：赤道几内亚比奥科岛南部海岸重要海龟筑巢种群的评估

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摘要

Bioko Island's southern beaches are important nesting sites for marine turtles in the Gulf of Guinea region. In this study, we present data on the 4 species of sea turtles nesting on 5 nesting beaches (19 km) of Bioko Island, from 2000 to 2014. A total of 43,860 leatherback (Dermochelys coriacea), 16,778 green (Chelonia mydas), 1731 olive ridley (Lepidochelys olivacea), and 85 hawksbill turtle (Eretmochelys imbricata) encounters, defined as the number of tracks, were recorded on Bioko's southern beaches. Since 2008, the estimated number of leatherback females ranged from 42 to 444, green turtles from 63 to 649, and olive ridley turtles from 22 to 53 annually. This study presents the first extensive tagging program on Bioko Island, where 790 leatherback turtles were tagged with Passive Integrated Transponder tags from 2008 to 2014. Only 6.1% of the tagged turtles returned to nest again with a remigration interval of 3-4 yrs. In addition, 279 green turtles were flipper-tagged in the 2013-2014 nesting season. Overall, the total number of leatherback turtle encounters decreased annually from 2000 to 2014. These declines may be attributed to adult turtle captures in commercial fisheries operating in the Gulf of Guinea and turtle take in local artisanal fisheries. On the other hand, olive ridley encounters increased from 2000 to 2014. The construction of a paved road from Luba, the second largest city on Bioko Island, directly to the nesting beaches is now set to dramatically alter human interaction with nesting turtles. These long-term data confirm the importance of Bioko Island's nesting beaches for the Southeast Atlantic and fill a critical need for sea turtle conservation in a data-deficient, yet globally significant, area.
机译：Bioko岛的南部海滩是几内亚湾地区海龟重要的筑巢地。在这项研究中，我们提供了2000年至2014年在Bioko岛的5个嵌套海滩（19公里）上筑巢的4种海龟的数据。共有43,860棱皮back（Dermochelys coriacea），16,778绿（Chelonia mydas），1731在比奥科（Bioko）的南部海滩上记录了橄榄ridley（Lepidochelys olivacea）和85只turtle（Eretmochelys imbricata）的遭遇，这被定义为足迹。自2008年以来，估计每年的棱皮龟雌性数量为42至444只，绿海龟为63至649只，橄榄鱼为22至53只。这项研究提出了Bioko岛上的第一个广泛的标签计划，从2008年到2014年，有790只棱皮龟被使用Passive Integrated Transponder标签进行了标签。只有6.1％的标签龟以3-4年的迁徙间隔再次归巢。此外，在2013-2014年的筑巢季节中，有279只绿海龟被装上了鳍状标签。总体而言，从2000年到2014年，棱皮龟的捕捞总数每年减少。这些下降可能归因于几内亚湾的商业捕鱼中成年乌龟的捕捞量以及当地手工渔业中捕捞的乌龟。另一方面，橄榄色ridley的遭遇从2000年增加到2014年。从Bioko岛第二大城市Luba到筑巢海滩之间的柏油路建设，将极大地改变人类与筑巢龟的互动。这些长期数据证实了Bioko岛的嵌套海滩对于东南大西洋的重要性，并满足了在数据匮乏但具有全球意义的地区保护海龟的关键需求。

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