Conservation translocations of Hawaiian monk seals: accounting for variability in body condition improves evaluation of translocation efficacy,Animal Conservation

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Conservation translocations of Hawaiian monk seals: accounting for variability in body condition improves evaluation of translocation efficacy
Animal Conservation ( IF 2.8 ) Pub Date : 2020-08-03 , DOI: 10.1111/acv.12622
J. D. Baker ₁ , M. M. Barbieri ₁ , T. C. Johanos ₁ , C. L. Littnan ₁ , J. L. Bohlander ₁ , A. C. Kaufman ₂ , A. L. Harting ₃ , S. C. Farry ₂ , C. H. Yoshinaga ₁

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To assess the efficacy of conservation translocations, survival of released individuals is typically compared to that of control groups. Such comparisons assume that treatment groups consist of otherwise equivalent individuals. When that assumption is unmet, incorporating physiological parameters may improve assessment of translocation programs. During 2012–2014, 19 weaned female Hawaiian monk seal pups were translocated to sites where survival prospects were expected to be more favorable than at their natal locations. We compared survival from weaning to age two years of translocated pups to two control groups; pups remaining at source sites and pups native to destination sites. To account for the known relationship between weaning girth and survival, we generated probability distributions of the number of survivors at source and destination sites given the weaning girths of translocated seals. Data were available to calculate girth‐adjusted survival probabilities for 13 of the translocated pups. Of these, we estimated that only one pup would have been expected to have survived had the translocated pups remained at their natal site. Seven of the 13 translocated seals survived, a value just below the median (eight) expected to have survived at the destination site. Thus, translocation substantially improved survival. Had we not accounted for weaning girth effects on survival, we would have erroneously concluded that the translocation program had yielded no survival benefit. Identifying and integrating correlates of survival into quantitative analyses associated with conservation translocations can reduce bias and lead to greater success.

中文翻译：

夏威夷和尚海豹的保护易位：考虑身体状况的变异性可改善对易位功效的评估

为了评估保护易位的功效，通常将释放的个体的存活率与对照组的存活率进行比较。此类比较假设治疗组由其他方面相同的个体组成。当该假设未得到满足时，纳入生理参数可能会改善对易位计划的评估。在2012-2014年期间，有19只断奶的夏威夷和尚海豹幼崽被转移到了预计生存前景比其出生地点更有利的地点。我们比较了从断奶到两岁大的易位幼犬与两个对照组的存活率。在源站点中保留的幼崽和在目标站点中本地的幼崽。为了说明断奶周长与生存之间的已知关系，考虑到易位海豹的断奶周长，我们在源头和目的点生成了幸存者数量的概率分布。数据可用于计算13个易位幼崽的经周长调整的生存概率。其中，我们估计，如果将易位的幼崽留在其出生地，则只预期会存活其中一只幼崽。在13个易位海豹中，有7个幸存下来，这个值略低于预期在目标地点幸存的中位数（8个）。因此，易位显着提高了存活率。如果我们不考虑断奶周长对生存的影响，我们会错误地得出结论，即移居计划没有产生任何生存利益。

更新日期：2020-08-03

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