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Influence of resource abundance on the structure of the insect community attracted to fermented tree sap

机译：资源丰富度对发酵树液吸引昆虫群落结构的影响

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摘要

There has been little or no documentation of the insect community attracted to fermented tree sap, despite our familiarity with it. This study describes the influence of resource abundance (exudate quantity) on species richness, insect abundance, and diversity at the patch level in order to elucidate the mechanisms responsible for community structure. Resource abundance was positively correlated with species richness and insect abundance, negatively correlated with the equitability index (J′), and not significantly correlated with diversity (Simpson's index of diversity; 1/D). Both correlation analyses and canonical correspondence analysis based on taxonomic categories indicated that responses to resource abundance were much greater in parasitoid wasps (Ichneumonoidea), drosophilid flies (Drosophilidae), and rove beetles (Staphylinidae). Field experiments showed that patches with more of the resource had greater species richness and greater hornet abundance. These results indicate that resource abundance is an important factor that affects community structure at the patch level, although it does not influence diversity directly, due to differences in the response to a resource across subgroups; drosophilid flies, the most abundant group that was heavily dependent on tree sap, make an especially large contribution to the change in J′. Various factors influence the variation in the response to resource abundance, including population size, feeding habits, and resource utilization patterns (i.e. whether the species uses patches as habitat).
机译：尽管我们对此很熟悉，但很少或没有关于昆虫群落被发酵树液吸引的文献。这项研究描述了斑块水平上资源丰富度（渗出量）对物种丰富度，昆虫丰富度和多样性的影响，以便阐明负责群落结构的机制。资源丰富度与物种丰富度和昆虫丰富度呈正相关，与公平性指数（J'）呈负相关，与多样性没有显着相关性（辛普森多样性指数； 1 / D）。相关性分析和基于分类学类别的规范对应分析均表明，对寄生虫黄蜂（Ichneumonoidea），果蝇（Drosophilidae）和褐甲虫（Staphylinidae）的资源丰富度响应要大得多。野外实验表明，具有更多资源的斑块具有更大的物种丰富度和更大的大黄蜂丰度。这些结果表明，资源丰富度是影响斑块级社区结构的重要因素，尽管由于亚组间对资源的反应不同，它不会直接影响多样性。嗜果蝇是最大量依赖树液的最丰富的群体，对J'的变化贡献特别大。各种因素都会影响对资源丰富度的响应变化，包括种群数量，摄食习惯和资源利用模式（即物种是否使用斑块作为栖息地）。

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