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Non-random distribution of weed species abundance in arable fields.

机译：耕地杂草物种丰富度的非随机分布。

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摘要

Many decisions for pest control in agriculture are based on densities, rather than species presence only. Little is known about the distribution of pest abundance and even less when several species present in a field may interact. With the aim of developing an ecologically based approach to weed management, we compared observed co-occurrence patterns with a null model, to test whether the abundances of weed species were randomly assembled. The data set covered the pattern of co-occurrence of abundances of weeds within 200-m2 plots located in 1143 arable fields scattered across France. Our results pinpointed a highly significant 'similar attraction-dissimilar repulsion' rule, as species reaching similar abundance levels co-occurred significantly more often than expected under the hypothesis of a random distribution of abundance. A similar analysis applied to the 25% plots that had the highest weed densities indicated that the 'similar attraction-dissimilar repulsion' rule held true for low-abundance classes, but not in situations where at least one species was observed at densities above 20 individuals m-2. Our analysis extends the analysis of community beyond the sole species richness index by accounting for their abundance. Overall, weed species interfered or responded similarly to an external biotic or abiotic factor, with resulting adjustment of densities at the scale of the agricultural field.Digital Object Identifier http://dx.doi.org/10.1111/j.1365-3180.2012.00920.x
机译：农业中害虫控制的许多决定都是基于密度，而不仅仅是物种的存在。人们对有害生物丰度的分布知之甚少，当田间存在的几种物种可能相互作用时，了解甚少。为了开发一种基于生态学的杂草治理方法，我们将观察到的共生模式与零模型进行了比较，以测试杂草物种的丰度是否随机组合。该数据集涵盖了分布在法国各地的1143个耕地中200 m 2 地块内杂草共生的模式。我们的结果指出了一个高度重要的“相似吸引－不同排斥”规则，因为达到相似丰度水平的物种比随机丰度的假设发生的频率要高得多。对杂草密度最高的25％地块进行的类似分析表明，“相似吸引－异种排斥”规则适用于低丰度类别，但在密度大于20的个体中观察到至少一个物种的情况下不适用m -2 。我们的分析通过考虑群落的丰富性，将其分析范围扩展到了唯一物种丰富度指数之外。总体而言，杂草物种对外部生物或非生物因子的干扰或响应类似，从而在农业规模上导致密度的调整。数字对象标识符http://dx.doi.org/10.1111/j.1365-3180.2012。 00920.x

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