Maguire Dorothy Y, Robert Katleen, Brochu Kristen, Larrivée Maxim, Buddle Christopher M, Wheeler Terry A
Department of Natural Resource Sciences, McGill University, Macdonald Campus, Ste-Anne-de-Bellevue, QC, H9X 3V9 Canada.
Environ Entomol. 2014 Feb;43(1):9-17. doi: 10.1603/EN13056.
Forest canopies support high arthropod biodiversity, but in temperate canopies, little is known about the spatial distribution of these arthropods. This is an important first step toward understanding ecological roles of insects in temperate canopies. The objective of this study was to assess differences in the species composition of two dominant and diverse taxa (Diptera and Coleoptera) along a vertical gradient in temperate deciduous forest canopies. Five sugar maple trees from each of three deciduous forest sites in southern Quebec were sampled using a combination of window and trunk traps placed in three vertical strata (understory, mid-canopy, and upper-canopy) for three sampling periods throughout the summer. Coleoptera species richness and abundance did not differ between canopy heights, but more specimens and species of Diptera were collected in the upper-canopy. Community composition of Coleoptera and Diptera varied significantly by trap height. Window traps collected more specimens and species of Coleoptera than trunk traps, although both trap types should be used to maximize representation of the entire Coleoptera community. There were no differences in abundance, diversity, or composition of Diptera collected between trap types. Our data confirm the relevance of sampling all strata in a forest when studying canopy arthropod biodiversity.
森林冠层拥有高度的节肢动物生物多样性，但在温带冠层中，对于这些节肢动物的空间分布却知之甚少。这是朝着理解昆虫在温带冠层中的生态作用迈出的重要第一步。本研究的目的是评估在温带落叶林冠层中，两个主要且多样的类群（双翅目和鞘翅目）沿垂直梯度的物种组成差异。在魁北克南部的三个落叶林地点，从每棵糖枫树上选取五棵，在夏季的三个采样期内，使用放置在三个垂直层次（林下植被层、冠层中部和冠层上部）的窗口陷阱和树干陷阱组合进行采样。鞘翅目的物种丰富度和丰度在冠层高度之间没有差异，但在上层冠层收集到了更多的双翅目标本和物种。鞘翅目和双翅目的群落组成因陷阱高度而有显著差异。窗口陷阱收集到的鞘翅目标本和物种比树干陷阱更多，尽管两种陷阱类型都应使用，以最大限度地代表整个鞘翅目群落。在不同陷阱类型之间，收集到的双翅目的丰度、多样性或组成没有差异。我们的数据证实了在研究冠层节肢动物生物多样性时对森林所有层次进行采样的相关性。
