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Rainforest-restoration success as judged by assemblages of soil- and litterdwelling mites (Arachnida: Acari)*

By Heather Proctor, John Kanowski, Carla P. Catterall, Grant Wardell, Australian Wildlife Conservancy and Northern Territory Region


Decline in rainforest cover in many areas of Australia is being countered by various methods of forest reestablishment, including ecological restoration plantings, timber plantations, and unmanaged regrowth. We used assemblages of soil- and litter-dwelling mites to determine which style most closely recaptures the assemblage structure of mites associated with intact rainforest at 84 tropical and subtropical sites in eastern Australia. The six habitat types surveyed were pasture (the typical ‘pre-restoration ’ state), unmanaged regrowth, monoculture forestry, multi-species forestry, ecological restoration and intact rainforest (the ‘target’state). Forestry and ecological restoration sites were 5–20 years old. Mites were extracted from soil/litter samples and (excluding Oribatida) identified to family or to finer levels. For two diverse but taxonomically difficult superfamilies characteristic of rainforest, Uropodoidea and Trombidioidea, identification was to morphotaxon. Presence/absence data were analyzed in several ways. First, we used our data to create a list of ‘indicator taxa ’ for pasture and rainforest, and determined the abundance of these indicators in each of the four reforestation methods. We also calculated morphotaxon richness for uropodoids and trombidioids and compared these values among habitat types. In both of these analyses, ecological restoration was most similar to rainforest. We used ordination and ANOSIM to compare mite assemblages among habitattypes

Year: 2013
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