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Regional differences in Kemp's ridley sea turtle growth trajectories and expected age at maturation

机译：Kemp的雷德利海龟生长轨迹和预期年龄在成熟时的区域差异

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摘要

For species of conservation concern, somatic growth and age at maturation are key parameters in models used to evaluate population dynamics, as spatial and temporal variability in growth rates may be particularly important for predicting population recovery. Following an oceanic juvenile developmental stage, endangered Kemp's ridley sea turtles Lepidochelys kempii occupy neritic habitats in 2 primary regions, the Gulf of Mexico (GoM) and along the US Atlantic coast. Results of prior studies suggest that somatic growth rates differ between these groups, which has the potential to influence maturation trajectories and relative reproductive contributions. To determine the nature and extent of potential regional differences, we conducted skeletal growth mark analysis (skeletochronology) with complementary annual bone growth increment-specific stable nitrogen isotope analysis that allowed delineation of oceanic-to-neritic habitat shifts for turtles stranded from 1993 to 2016. Results demonstrate that in the GoM, the oceanic-to-neritic habitat transition is associated with younger ages and faster somatic growth rates than in US Atlantic waters. Overall, US Atlantic somatic growth response was depressed relative to that in the GoM throughout all juvenile life stages, and this disparity persisted for more than 20 yr. This discrepancy translated into regional divergence in size-at-age relationships and maturation trajectories, with the prediction that US Atlantic Kemp's ridleys would mature on average 2 to 3 yr later than their GoM counterparts. These analyses provide important baseline information on somatic growth rates and predicted age at maturation that can facilitate the evaluation of factors contributing to recent fluctuations in reproductive output for this endangered population.
机译：对于保护担忧的种类，成熟的体细胞生长和年龄是用于评估人口动态的模型的关键参数，因为生长率的空间和时间变异可能对预测人口恢复尤为重要。在海洋少年发展阶段之后，濒临灭绝的Kemp的Ridley海龟延迟Chies Kempii占据了2个主要地区的中间人栖息地，墨西哥湾（GOM）和美国大西洋海岸。事先研究结果表明，这些组之间的躯体增长率不同，这具有影响成熟轨迹和相对生殖贡献的潜力。为了确定潜在的区域差异的性质和程度，我们进行了骨骼生长标记分析（骨骼），具有互补的年度骨生长增量稳定的氮同位素分析，允许划分1993年至2016年陷入乌龟的海洋对栖息地栖息地。结果表明，在GOM中，海洋对中的栖息地转变与年轻年龄和更快的躯体增长率相关，而不是美国大西洋水域。总体而言，在所有少年生命阶段的GOM中，美国大西洋体育增长反应受到沮丧，这种差异持续了20多千万。这种差异转化为尺寸 - 时代的关系和成熟轨迹的区域分歧，预测美国大西洋KEMP的ridleys平均比他们的GOM对应者更晚2到3年。这些分析提供了关于躯体增长率的重要基线信息，并在成熟时预测的年龄可以促进评估促进这种濒危人群的繁殖产出最近波动的因素。

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  • 来源
    《Marine ecology progress series》 |2020年第12期|143-161|共19页
  • 作者

    Avens Larisa; Ramirez Matthew D.; Hall April G.; Snover Melissa L.; Haas Heather L.; Godfrey Matthew H.; Goshe Lisa R.; Cook Melissa; Heppell Selina S.;

  • 作者单位

    NOAA Natl Marine Fisheries Serv Southeast Fisheries Sci Ctr Beaufort Lab 101 Fivers Isl Rd Beaufort NC 28516 USA;

    Oregon Slate Univ Dept Fisheries & Wildlife 104 Nash Hall Corvallis OR 97331 USA;

    NOAA Natl Marine Fisheries Serv Southeast Fisheries Sci Ctr Beaufort Lab 101 Fivers Isl Rd Beaufort NC 28516 USA;

    Lynker Technol POB 3673 Pago Pago 96799 Samoa;

    Natl Marine Fisheries Serv Northeast Fisheries Sci Ctr 166 Water St Woods Hole MA 02543 USA;

    North Carolina Wildlife Resources Commiss 1528 Ann St Beaufort NC 28516 USA;

    NOAA Natl Marine Fisheries Serv Southeast Fisheries Sci Ctr Beaufort Lab 101 Fivers Isl Rd Beaufort NC 28516 USA;

    Natl Marine Fisheries Serv Southeast Fisheries Sci Ctr Pascagoula Lab 3209 Freder St Pascagoula MS 39567 USA;

    Oregon Slate Univ Dept Fisheries & Wildlife 104 Nash Hall Corvallis OR 97331 USA;

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  • 正文语种 eng
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  • 关键词

    Lepidochelys kempii; Age; Skeletochronology; Stable isotope analysis;

    机译：Lepidochelys Kempii;年龄;骨骼影影;稳定同位素分析;

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