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首页> 外文期刊>Herpetologica >Headstarting as a management tool: A case study of the plains gartersnake
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Headstarting as a management tool: A case study of the plains gartersnake

机译：领先作为一种管理工具：以平原吊袜带为例

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The use of headstarting and related techniques as management tools for threatened and endangered species remains controversial, due in part to a lack of empirical data on their effectiveness. Here, we present data on pre-natal mortality, growth, and survival during headstarting as well as growth, survival, and reproduction following release for an unprotected population of plains gartersnakes. We combine these data with data on growth and survival of comparably sized wild-caught snakes to provide an overall evaluation of the potential effectiveness of headstarting. Depending on rearing conditions, proportions of live births varied from 0.79 ('worst-case') to 0.94 ('best-case'), survival during headstarting ranged from 0.74 ('worstcase') to 0.88 ('best-case'), and second-year survival following release ranged from 0.11 ('worst-case') to 0.40 ('best-case'). In comparison, survival of free-ranging snakes was 0.16 in their first year and 0.40 in their second year. Assuming the proportion of live births in nature is close to 1, expected survival to reproductive maturity among free-ranging snakes is 0.06, whereas that for headstarted snakes ranges from 0.07 ('worst-case') to 0.33 ('best-case'). The growth rate of headstarted snakes following release was similar to that of similar-sized free-ranging snakes, and headstarted snakes were successful at reproduction. Together, these results suggest that, if carefully implemented, headstarting may be in effective management tool for endangered plains gartersnake populations in Ohio and for other natricine snakes with similar demographic characteristics.
机译：对于某些受威胁和濒危物种而言，使用开创性技术和相关技术作为管理工具仍然存在争议，部分原因是缺乏有关其有效性的经验数据。在这里，我们提供了有关无保护的平原吊袜带释放过程中出生前死亡率，生长和存活以及出生后生长，存活和繁殖的数据。我们将这些数据与同等大小的野蛇的生长和生存数据结合起来，以全面评估先发制人的潜在有效性。根据饲养条件的不同，活产婴儿的比例从0.79（“最坏情况”）到0.94（“最坏情况”）不等，抢先阶段的存活率从0.74（“最坏情况”）到0.88（“最坏情况”）不等，释放后的第二年生存率从0.11（“最坏情况”）到0.40（“最佳情况”）不等。相比之下，散养蛇的存活率在第一年为0.16，第二年为0.40。假设自然界中活产婴儿的比例接近1，则自由放养的蛇对生殖成熟的预期存活率为0.06，而刚起步的蛇的存活率范围为0.07（“最坏情况”）至0.33（“最坏情况”） 。释放后的先发蛇的生长速度与类似大小的散养蛇的生长速度相似，并且先发蛇在繁殖方面很成功。总之，这些结果表明，如果谨慎实施，对于在俄亥俄州濒临灭绝的平原吊袜蛇种群和其他具有类似人口统计学特征的蛇头蛇来说，抢先可能是有效的管理工具。

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