Targeting eradication of introduced watersnakes using integral projection models,Animal Conservation

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Targeting eradication of introduced watersnakes using integral projection models
Animal Conservation ( IF 2.8 ) Pub Date : 2020-05-08 , DOI: 10.1111/acv.12590
Jonathan P. Rose ₁ , Brian D. Todd ₂

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Projection models are frequently used to identify and evaluate management actions to control or eradicate non‐native species. Integral projection models (IPMs) are an appealing option for many taxa because IPMs can model vital rates as a function of continuous variables, like size, without discretizing into a few classes. Despite their strengths, IPMs have yet to see widespread use in invasive species management. Here, we used an IPM to evaluate management actions for an introduced population of common watersnakes (Nerodia sipedon) recently established in California, USA, where they pose a threat to many highly imperiled native fauna. We developed the IPM using data on the survival, growth and fecundity of native and non‐native populations of N. sipedon to identify management targets that would facilitate its eradication. Population growth of N. sipedon was most sensitive to the growth and survival of snakes during their first year, when they grow from approximately 180 mm snout–vent length (SVL) to 350 mm, providing a clear target for eradication efforts. The IPM also provided finer resolution life‐history information for targeting eradication than a simple size class‐based matrix model. Simulated eradication effort showed funnel trapping, which targets all but the smallest and largest snakes, was more effective at decreasing population growth than hand capture focused on snakes >400 mm SVL. Our study highlights the value of IPMs for targeting eradication of introduced or invasive species, and we argue for wider adoption of these models for evaluating management actions.

中文翻译：

使用积分投影模型有针对性地消除已引入的水蛇

投影模型通常用于识别和评估控制或消灭非本地物种的管理措施。集成投影模型（IPM）是许多生物分类的一种吸引人的选择，因为IPM可以将生命率建模为连续变量（例如大小）的函数，而不必离散为几类。尽管IPM具有优势，但尚未在入侵物种管理中得到广泛应用。在这里，我们使用IPM评估了最近在美国加利福尼亚州建立的普通水蛇（Nerodia sipedon）引种种群的管理行动，这些水蛇对许多高度濒危的本地动物构成威胁。我们使用关于北雪草猪笼草本地种群和非本地种群生存，生长和繁殖力的数据开发了IPM确定有助于消除该疾病的管理目标。西佩顿猪笼草的人口增长对蛇的生长和生存最敏感的是第一年，即蛇的口鼻长度（SVL）从大约180毫米增长到350毫米，为根除工作提供了明确的目标。与简单的基于大小类别的矩阵模型相比，IPM还提供了更精细的分辨率寿命历史信息以用于目标消除。模拟的根除工作表明，针对除最小和最大的蛇以外的所有蛇，漏斗陷阱在减少种群增长方面比集中于> 400 mm SVL的蛇的捕获更为有效。我们的研究凸显了IPM在针对根除已引进或入侵物种方面的价值，并且我们主张更广泛地采用这些模型来评估管理措施。

更新日期：2020-05-08

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