Analysis on Population Level Reveals Trappability of Wild Rodents Is Determined by Previous Trap Occupant.
Analysis on Population Level Reveals Trappability of Wild Rodents Is Determined by Previous Trap Occupant.
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DOI：
10.1371/journal.pone.0145006
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发表时间：
2015
期刊：
影响因子：
3.7
通讯作者：
Buesching CD
中科院分区：
文献类型：
--
作者：
Brouard MJ;Coulson T;Newman C;Macdonald DW;Buesching CD
活捕是研究小型哺乳动物的核心。因此，需要在后续分析中理解和解释任何偏倚，以确保准确的群体估计。一个很少被考虑的偏见是个人的行为反应的陷阱，特别是嗅觉线索留下的前居住者（PO）。我们使用了2002年8月至2013年11月期间在英国牛津郡Wytham Woods的17个独立诱捕会话中的8，115个陷阱夜晚的数据集，以检查进入陷阱的决定是否受到PO的影响，如果这在传统的捕获-标记-再捕获诱捕数据中是可检测的（即，没有独特标记的个体），以及这种效应是否可能使所获得的群体估计值产生偏差。收集了关于森林姬鼠、灰鼠和田鼠的数据。三个广义线性模型揭示了一个显着的趋势，三个物种进入陷阱与同种PO。例如，A.与含有M.夜间在草原上觅食。模拟强调，当所有其他因素相等时，具有最高PO效应的物种将具有最高捕获率，因此返回更准确的种群估计值。尽管数据集很大，但某些种属、性别和/或年龄组合的代表性不足，因此无法评价任何其他个体特异性特征的影响。对个体进行独特的标记可以使PO效应与其他偏见（如陷阱害羞和空间异质性）脱钩，但可能并非在所有情况下都是可能的，这取决于研究的目的和可用的资源。
Live trapping is central to the study of small mammals. Thus, any bias needs to be understood and accounted for in subsequent analyses to ensure accurate population estimates. One rarely considered bias is the behavioural response of individuals to the trap, in particular the olfactory cues left behind by previous occupants (PO). We used a data set of 8,115 trap nights spanning 17 separate trapping sessions between August 2002 and November 2013 in Wytham Woods, Oxfordshire, UK to examine if the decision to enter a trap was affected by the PO, if this was detectable in traditional Capture-Mark-Recapture trapping data (i.e., individuals not uniquely marked), and if it was possible for this effect to bias the population estimates obtained. Data were collected on Apodemus sylvaticus, Myodes glareolus, and Microtus agrestis. Three Generalised Linear Models revealed a significant tendency for the three species to enter traps with same-species PO. With, for example, A. sylvaticus 9.1 times more likely to enter a same species PO trap compared to one that contained a M. agrestis in the grassland during the nocturnal period. Simulation highlighted that, when all other factors are equal, the species with the highest PO effect will have the highest capture rate and therefore return more accurate population estimates. Despite the large dataset, certain species-, sex-, and/ or age-combinations were under-represented, and thus no effects of any additional individual-specific characteristics could be evaluated. Uniquely marking individuals would allow for the PO effect to be disentangled from other biases such as trap-shyness and spatial heterogeneity, but may not be possible in all cases and will depend on the aims of the study and the resources available.