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Effects of understory structure on the abundance, richness and diversity of Collembola (Arthropoda) in southern Brazil

DOI: 10.1590/S1519-566X2009000300007

Keywords: human action, landscape structure, araucaria forest, arthropod community.

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Abstract:

the purpose of this study was to investigate the effects of different landscape structures on the understory collembola community. four different forest physiognomies were compared: pinus spp. plantation, eucalyptus spp. plantation, araucaria angustifolia plantation, and a remaining native araucaria forest. three areas containing two sampling units (25 m x 2 m each) were selected in each forest physiognomy. understory collembola collection was done with a 1 x 1m canvas sheet held horizontally below the vegetation, which was beaten with a 1m long stick, seasonally from september 2003 to august 2004. we evaluated the influence of forest physiognomies on the abundance, richness and diversity of collembola communities. it was also verified if the habitat structure of each physiognomy was associated with the composition of the collembola community. a total number of 4,111 individuals were collected belonging to the families entomobrydae and tomocerida (entomobryomorpha), and sminthuridae (symphypleona), and divided in 12 morphospecies. pinus plantation presented the highest richness, abundance and diversity of collembola and it was associated to diverse understory vegetation. the abundance of entomobrydae and sminthuridae was associated to the presence of bushes, while tomoceridae abundance was associated to the presence of trees. the habitat structure, measured through understory vegetation density and composition, plays an important role on the determination of the structure and composition of the collembola community.

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