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Evaluating and comparing reproductive parameters of northern sea otters (Enhydra lutris kenyoni) in Alaska.

机译：评价和比较阿拉斯加北部水獭（Enhydra lutris kenyoni）的繁殖参数。

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Life history theory predicts that populations with different growth trajectories are likely to differ in demographic parameters. In Alaska there are three sea otter stocks that have different population status. To determine if stocks differed in demographic rate, this study developed a technique to estimate parous status and average age at first reproduction (aAFR) from premolar cementum annuli width measurements. Subsequently, we compare aAFR and reproductive rates (RR) among spatially and temporally isolated sea otter stocks. Spatial comparisons revealed that aAFR was oldest in the most stable sea otter stock, while the temporal comparison revealed that aAFR was younger in southwest Alaska when the stock was declining, as compared to when it was stable. RR did not differ in space or time. These findings support the hypothesis that southwest Alaska sea otters are declining due to top down effects, and demonstrate the utility of demographic parameters in wildlife population management.
机译：生命史理论预测，具有不同增长轨迹的人口的人口统计学参数可能会有所不同。在阿拉斯加，有三只水獭种群处于不同的种群状况。为了确定种群的人口统计率是否存在差异，本研究开发了一种技术，可通过前磨牙牙骨质环宽度测量来估算初次生殖的同伴状态和平均年龄。随后，我们比较了时空隔离的海獭种群的aAFR和繁殖率（RR）。空间比较显示，aAFR在最稳定的水獭种群中最古老，而时间比较显示，在种群减少时，阿拉斯加西南部的aAFR比稳定时更年轻。 RR在空间或时间上没有差异。这些发现支持以下假设：由于自上而下的影响，西南阿拉斯加海獭正在减少，并证明了人口统计参数在野生动植物种群管理中的效用。

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