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首页> 外文期刊>Marine biology >Satellite tracking reveals a dichotomy in migration strategies among juvenile loggerhead turtles in the Northwest Atlantic
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Satellite tracking reveals a dichotomy in migration strategies among juvenile loggerhead turtles in the Northwest Atlantic

机译：卫星跟踪揭示了西北大西洋海龟在迁移策略中的二分法

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摘要

Few data are available on the movements and behavior of immature Atlantic loggerhead sea turtles (Caretta caretta) from their seasonal neritic foraging grounds within the western north Atlantic. These waters provide developmental habitat for loggerheads originating from several western Atlantic nesting stocks. We examined the long-term movements of 23 immature loggerheads (16 wild-caught and seven headstart turtles) characterizing their seasonal distribution, habitat use, site fidelity, and the oceanographic conditions encountered during their migrations. We identified two movement strategies: (1) a seasonal shelf-constrained north-south migratory pattern; and (2) a year-round oceanic dispersal strategy where turtles travel in the Gulf Stream to the North Atlantic and their northern dispersal is limited by the 10-15℃ isotherm. When sea surface temperatures dropped below 20℃, neritic turtles began a migration south of Cape Hatteras, North Carolina (USA) where they established fidelity to the waters between North Carolina's Outer Banks and the western edge of the Gulf Stream along outer continental shelf. Two turtles traveled as far south as Florida. Severalrnturtles returned to their seasonal foraging grounds during subsequent summers. Northern movements were associated with both increased sea surface temperature (>21℃) and increased primary productivity. Our results indicate strong seasonal and interannual philopatry to the waters of Virginia (summer foraging habitat) and North Carolina (winter habitat). We suggest that the waters of Virginia and North Carolina provide important seasonal habitat and serve as a seasonal migratory pathway for immature loggerhead sea turtles. North Carolina's Cape Hatteras acts as a seasonal "migratory bottleneck" for this species; special management consideration should be given to this region. Six turtles spent time farther from the continental shelf. Three entered the Gulf Stream near Cape Hatteras, traveling in the current to the northwest Atlantic. Two of these turtles remained within an oceanic habitat from 1 to 3 years and were associated with mesoscale features and frontal systems. The ability of large benthic subadults to resume an oceanic lifestyle for extended periods indicates plasticity in habitat use and migratory strategies. Therefore, traditional life history models for loggerhead sea turtles should be reevaluated.
机译：很少有关于未成熟大西洋海龟（Caretta caretta）从其在北大西洋西部的季节性侵蚀觅食场的运动和行为的数据。这些水域为来自西大西洋一些筑巢种群的顶提供了发育的栖息地。我们研究了23只未成熟的（16只野生捕捞的海龟和7只刚开始的海龟）的长期运动，它们的季节性分布，栖息地使用，地点保真度以及迁徙过程中遇到的海洋条件特征。我们确定了两种运动策略：（1）季节限制的南北向迁移模式； （2）全年的海洋扩散策略，即海龟在墨西哥湾流中到达北大西洋，其北部扩散受到等温线10-15℃的限制。当海表温度降至20℃以下时，海龟开始向北卡罗来纳州哈特拉斯角（美国）南部迁徙，在那里他们对北卡罗来纳州外河岸与墨西哥湾流西缘之间沿外大陆架的水域保持了忠诚。两只乌龟向南走到佛罗里达。在随后的夏季，几只海龟回到了季节性觅食地。北方运动与海面温度升高（> 21℃）和初级生产力提高有关。我们的结果表明，弗吉尼亚州（夏季觅食栖息地）和北卡罗来纳州（冬季栖息地）的水域存在强烈的季节性和年际变化。我们建议弗吉尼亚州和北卡罗来纳州的水域提供重要的季节性栖息地，并作为不成熟的海龟的季节性迁徙途径。北卡罗来纳州的哈特拉斯角（Cape Hatteras）是该物种的季节性“迁徙瓶颈”。应对该地区进行特别的管理考虑。六只乌龟把时间花在了距离大陆架更远的地方。三人进入哈特拉斯角附近的墨西哥湾流，沿潮流流向西北大西洋。这些乌龟中的两只留在海洋栖息地中1至3年，并与中尺度特征和额叶系统有关。大型底栖亚成体能够长期恢复海洋生活方式的能力表明了栖息地利用和迁徙策略的可塑性。因此，应该重新评估传统的海龟生活史模型。

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  • 来源
    《Marine biology》 |2009年第12期|2555-2570|共16页
  • 作者

    Katherine L. Mansfield; rnVincent S. Saba; John A. Keinath; rnJohn A. Musick;

  • 作者单位

    National Marine Fisheries Service, Southeast Fisheries Science Center, 75 Virginia Beach Drive, Miami, FL 33149, USA Virginia Institute of Marine Science, College of William and Mary, P.O. Box 1346, Gloucester Point, VA 23062, USA;

    rnVirginia Institute of Marine Science, College of William and Mary, P.O. Box 1346, Gloucester Point, VA 23062, USA;

    rn176 Herbal Lane, Midway, GA 31320, USA;

    rnVirginia Institute of Marine Science, College of William and Mary, P.O. Box 1346, Gloucester Point, VA 23062, USA;

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