Modeling the Effect of Toe Clipping on Treefrog Survival: Beyond the Return Rate
Modeling the Effect of Toe Clipping on Treefrog Survival: Beyond the Return Rate
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模拟剪趾对树蛙生存的影响：超越回报率
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
H. F. Percival
中科院分区：
文献类型：
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作者：
J. H. Waddle;Kenneth G. Rice;F. Mazzotti;H. F. Percival
摘要：一些研究已经描述了剪趾对有标记无尾蝇的收益率的负面影响，但收益率的局限性在于它没有考虑捕获概率的异质性。我们使用开放种群标记-再捕获模型来估计两种树蛙的表观存活率（φ）和再捕获概率(p)，这些树蛙分别被剪掉2-4个脚趾。我们使用信息论模型选择来检验剪脚趾对生存的影响，同时考虑捕获概率的变化。模型选择结果表明，剪趾对绿树蛙（Hyla cinerea）存活的影响得到了强有力的支持，而剪趾对捕获概率的影响得到了有限的支持。我们估计，与只切除两个脚趾的个体相比，切除三个和四个脚趾的绿树蛙的平均绝对存活率分别下降了5.02%和11.16%。对松鼠树蛙（Hyla squirella）的研究结果表明，剪脚趾对存活的影响不大，但可能对捕获概率有负面影响。我们认为，不应该仅用回收率来检验标记动物的存活率，因为必须假设恒定的捕获概率，并且我们的例子表明捕获概率如何随时间和群体而变化。标记-再捕获模型提供了一种方法来估计在使用独特标记的情况下剪脚趾对无尾猿生存的影响。
Abstract Some studies have described a negative effect of toe clipping on return rates of marked anurans, but the return rate is limited in that it does not account for heterogeneity of capture probabilities. We used open population mark-recapture models to estimate both apparent survival (φ) and the recapture probability (p) of two treefrog species individually marked by clipping 2–4 toes. We used information-theoretic model selection to examine the effect of toe clipping on survival while accounting for variation in capture probability. The model selection results indicate strong support for an effect of toe clipping on survival of Green Treefrogs (Hyla cinerea) and only limited support for an effect of toe clipping on capture probability. We estimate there was a mean absolute decrease in survival of 5.02% and 11.16% for Green Treefrogs with three and four toes removed, respectively, compared to individuals with just two toes removed. Results for Squirrel Treefrogs (Hyla squirella) indicate little support for an effect of toe clipping on survival but may indicate some support for a negative effect on capture probability. We believe that the return rate alone should not be used to examine survival of marked animals because constant capture probability must be assumed, and our examples demonstrate how capture probability may vary over time and among groups. Mark-recapture models provide a method for estimating the effect of toe clipping on anuran survival in situations where unique marks are applied.