Solving the pitfalls of pitfall trapping: a two‐circle method for density estimation of ground‐dwelling arthropods
Solving the pitfalls of pitfall trapping: a two‐circle method for density estimation of ground‐dwelling arthropods
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DOI：
10.1111/2041-210x.12083
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发表时间：
2013-09
影响因子：
6.6
通讯作者：
Zihua Zhao;P. Shi;C. Hui;Fang Ouyang;F. Ge;Bai-lian Li
中科院分区：
文献类型：
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作者：
Zihua Zhao;P. Shi;C. Hui;Fang Ouyang;F. Ge;Bai-lian Li
陷阱陷阱被广泛用于调查地面生活的节肢动物，但由于其物种，栖息地和引诱剂特定的诱捕半径而受到严重批评，这导致物种多样性和密度的估计不可靠。我们开发了一种双圆法（TCM），用于同时估计地面节肢动物的密度和有效诱捕半径。多对陷阱位于不同距离处，并且可以使用逆三角函数来计算陷阱区域的相交。密度和有效诱捕半径可以从捕获的个体总数与成对陷阱之间的距离的变化的非线性回归来估计。我们比较了TCM与基于嵌套交叉阵列（NCA）的估计器的性能，通过比较这两种方法的预测密度与抽吸采样方法（SSM）获得的真实的密度来布置陷阱。已知节肢动物密度和有效诱捕半径的模拟表明，TCM产生准确的密度估计，而NCA显着低估了已知的密度。陷阱陷阱诱捕地面生活在两个栖息地（农田和荒漠草原）的节肢动物证实了这一结论时，比较估计从TCM和NCA与密度从SSM获得。TCM是一种很有前途的地面节肢动物密度估计技术，特别是对于具有液体引诱剂的陷阱和具有相对均匀的栖息地且远离栖息地边缘的区域。
Pitfall traps are widely used for investigating ground‐dwelling arthropods, but have been heavily criticized due to their species‐, habitat‐ and attractant‐specific trapping radius which produces unreliable estimation of species diversity and density. We developed a two‐circle method (TCM) for simultaneously estimating densities of ground‐dwelling arthropods and the effective trapping radius. Multiple pairs of traps are located different distances apart, and the intersection of trapping areas can be calculated using the inverse trigonometric function. The density and effective trapping radius can be estimated from a nonlinear regression of the change in the total number of individuals caught with the distance between the paired pitfall traps. We compared the performance of TCM with the estimator based on the nested‐cross array (NCA) for arranging pitfall traps, by comparing predicted densities from these two methods with the real density obtained from the suction sampling method (SSM). Simulations with known arthropod densities and effective trapping radius suggested that TCM produced accurate density estimation, while NCA significantly underestimated the known density. Pitfall trapping of ground‐dwelling arthropods on two habitats (crop field and desert steppe) confirmed this conclusion when comparing estimation from TCM and NCA with densities obtained from the SSM. TCM is a promising technique for the density estimation of ground‐dwelling arthropods, especially for traps with liquid attractant and areas with relatively homogenous habitat and away from habitat edges.