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Age and size at maturation- and adult-stage duration for loggerhead sea turtles in the western North Atlantic

机译：北大西洋西部的海龟成熟期和成年期的年龄和大小

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Age at maturation data are integral to understanding dynamics of threatened and endangered sea turtle populations. However, full characterization of this parameter requires information regarding variability in growth rates and both size and age at maturation potentially resulting from diverse environmental and biological influences. To address the need for these data, skeletochronological analysis was conducted for US Atlantic loggerhead sea turtles Caretta caretta. The influence of different covariates on back-calculated growth rates for the years 1976-2010 was investigated, and while growth decreased overall with size and age, at larger sizes, male growth rates were higher than those of females. Growth varied significantly by calendar year, increasing from 1990 to 1996/1997 and subsequently decreasing through the end of the study period. Mean sizes [cm straightline carapace length (SCL)] corresponding to the "rapprochement" skeletal growth mark associated with maturation were 90.5 for females (range 75.0-101.3) and 95.8 for males (range 80.6-103.8). Ages at maturation estimated from (1) the rapprochement skeletal growth mark; (2) back-calculated SCL-at-age data; and (3) bootstrapping and fitting Fabens modified von Bertalanffy growth curve to back-calculated growth data were very similar between approaches, but demonstrated a wide possible range. Mean age predictions associated with minimum and mean maturation SCLs were 22.5-25 and 36-38 years for females and 26-28 and 37-42 years for males. Post-maturation longevity (i.e., adult-stage duration) was similar for males and females, ranging from 4 to 46 years (mean 19 years).
机译：成熟年龄数据对于了解受威胁和濒危海龟种群的动态是必不可少的。但是，要完全表征此参数，需要有关增长率变化以及成熟时的大小和年龄的信息，这些信息可能是由各种环境和生物影响所导致的。为了满足这些数据的需求，我们对美国大西洋的logger海龟Caretta caretta进行了骨骼年代学分析。研究了不同协变量对1976-2010年间反向计算的增长率的影响，虽然总体上随着年龄和年龄的增长而下降，但在较大的规模上，男性的增长率高于女性。 1990到1996/1997年之间，日历年度的增长差异很大，随后在研究期末下降。对应于与成熟相关的“和解”骨骼生长标记的平均大小[cm直线甲壳长度（SCL）]，女性为90.5（范围75.0-101.3），男性为95.8（范围80.6-103.8）。根据（1）和解骨骼生长标记估算的成熟年龄； （2）反算SCL年龄数据； （3）引导和拟合Fabens修改的von Bertalanffy生长曲线到反向计算的生长数据之间，两种方法非常相似，但证明了可能的范围很广。与最小和平均成熟SCL相关的平均年龄预测为女性为22.5-25和36-38岁，男性为2​​6-28和37-42岁。男性和女性的成熟后寿命（即成年阶段的持续时间）相似，范围为4至46岁（平均19岁）。

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  • 来源
    《Marine biology》 |2015年第9期|1749-1767|共19页
  • 作者

    Avens Larisa; Goshe Lisa R.; Coggins Lew; Snover Melissa L.; Pajuelo Mariela; Bjorndal Karen A.; Bolten Alan B.;

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    NOAA, Beaufort Lab, Fisheries Southeast Fisheries Sci Ctr, Beaufort, NC 28516 USA;

    NOAA, Beaufort Lab, Fisheries Southeast Fisheries Sci Ctr, Beaufort, NC 28516 USA;

    US Fish & Wildlife Serv, Yukon Delta Natl Wildlife Refuge, Bethel, AK 99559 USA;

    Duke Univ, Marine Lab, Beaufort, NC 28516 USA;

    Univ Florida, Archie Carr Ctr Sea Turtle Res, Gainesville, FL 32611 USA|Univ Florida, Dept Biol, Gainesville, FL 32611 USA;

    Univ Florida, Archie Carr Ctr Sea Turtle Res, Gainesville, FL 32611 USA|Univ Florida, Dept Biol, Gainesville, FL 32611 USA;

    Univ Florida, Archie Carr Ctr Sea Turtle Res, Gainesville, FL 32611 USA|Univ Florida, Dept Biol, Gainesville, FL 32611 USA;

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