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Analyzing species distributions among temporary ponds with a permutation test approach to the join-count statistic

机译:使用加入检验统计量的置换检验方法分析临时池塘之间的物种分布

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摘要

The Bluff Springs Sand Ponds (BSSPs) are a set of closely-spacd temporary ponds of varying hydroperiod, depth and surface area. We sampled crustacean communities of 15 ponds throughout hydroperiods in 1996 to examine species distributions among ponds. Although ponds were closely spaced (within ca. 16 ha), most species were present in subsets of the 15 ponds. We then analyzed spatial patterns of 12 crustacean species for complete spatial randomness (CSR) using join-count statistics. However, the join-count was designed for large-samples (n > 50), so we further analyzed (by simulation) the join-count and a variation of the join-count (Cliff & Ord, 1981) for small-scale reliability. Simulation results revealed that neither testing distribution was reliable for n < 30. We then used a permutation test to analyze species distributions and concluded that some species were distributed non-randomly. Therefore,further investigations of mechanisms causing species distributions (e.g., hydroperiod, physical/chemical conditions, biotic interactions) are clearly prescribed. The permutation test should be useful for studies of species distribution patterns among other temporary waters, and can help focus studies on causal mechanisms of distributions among small numbers of temporary aquatic habitats.
机译:布拉夫斯普林斯沙池(BSSP)是一组间隔紧密的临时池塘,它们的水力周期,深度和表面积各不相同。我们在1996年的整个水文时期对15个池塘的甲壳类群落进行了采样,以研究池塘之间的物种分布。尽管池塘间隔很近(约16公顷内),但大多数物种仍存在于15个池塘的子集中。然后,我们使用连接计数统计数据分析了12种甲壳类物种的空间格局,以获得完整的空间随机性(CSR)。但是,联接计数是为大样本(n> 50)设计的,因此我们进一步(通过模拟)分析了联接计数和联接计数的变化(Cliff&Ord,1981),以实现小规模的可靠性。 。仿真结果表明,对于n <30,这两种测试分布都不可靠。然后,我们使用置换测试分析物种分布,并得出结论,某些物种是非随机分布的。因此,明确规定了引起物种分布的机制的进一步研究(例如,水周期,物理/化学条件,生物相互作用)。排列测试应有助于研究其他临时水域中物种的分布方式,并有助于将研究重点放在少数临时水生生境中分布的因果机制上。

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