Spatial patterns of bee captures in North American bowl trapping surveys
Spatial patterns of bee captures in North American bowl trapping surveys
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DOI：
10.1111/j.1752-4598.2009.00074.x
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发表时间：
2010-02-01
影响因子：
3.5
通讯作者：
Conrad, Casey
中科院分区：
文献类型：
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作者：
Droege, Sam;Tepedino, Vincent J.;Conrad, Casey
碗和盘陷阱现在通常用于捕获蜜蜂（膜翅目：蜂形目）进行研究和调查。为了提高这种捕获技术的效率，需要研究碗状陷阱的布置和间距对蜜蜂捕获的影响。我们介绍了在北美四个生态区（大西洋中部、加利福尼亚沿海、奇瓦瓦沙漠和哥伦比亚高原）放置在捕集网、网格和样带中的七项碗状捕集器研究的结果。研究人员捕获了31个蜜蜂属的6000多个标本，并对其进行了分析。根据捕获网和距离测试的结果，在碗间距为3-5米之前，每个碗的蜜蜂捕获率不会趋于平稳。在56个样本中，有26个样本的分散指数值符合成团分布，39个样本的格林指数为正，13个样本为零，只有4个样本为负。但结块程度较轻，平均仅为0.06（指数范围为-1 ~ 1），仅有5个值> 0.15。类似地，运行测试仅对5.9%的横断面具有显著性。结果表明：(i)捕获率不受样带内碗之间距离的影响；（ii）碗和样带应分散在整个研究地点。
Bowl and pan traps are now commonly used to capture bees (Hymenoptera: Apiformes) for research and surveys.Studies of how arrangement and spacing of bowl traps affect captures of bees are needed to increase the efficiency of this capture technique.We present results from seven studies of bowl traps placed in trapping webs, grids, and transects in four North American ecoregions (Mid-Atlantic, Coastal California, Chihuahuan Desert, and Columbia Plateau).Over 6000 specimens from 31 bee genera were captured and analysed across the studies.Based on the results from trapping webs and distance tests, the per bowl capture rate of bees does not plateau until bowls are spaced 3-5 m apart.Minor clumping of bee captures within transects was detected, with 26 of 56 transects having index of dispersion values that conform to a clumped distribution and 39 transects having positive Green's index values, 13 with zero, and only four negative. However, degree of clumping was slight with an average value of only 0.06 (the index ranges from -1 to 1) with only five values > 0.15. Similarly, runs tests were significant for only 5.9% of the transects.Results indicate that (i) capture rates are unaffected by short distances between bowls within transects and (ii) that bowls and transects should be dispersed throughout a study site.