Dynamics of soil macroinvertebrates and its relationships to vegetation in a secondary succession of the Venezuelan paramo
Keywords:
páramo, sucesión, macroinvertebrados edáficos, vegetación, diversidad, AndesAbstract
The density, diversity and structure of the community of soil macroinvertebrates as well as the relationship between soil fauna and plant biodiversity were analysed along a secondary succession in the Páramo de Gavidia (Venezuelan Andes). Plots with 0 (just harvested), 1 and 6 years in fallow and areas of never cultivated paramo (four repetitions per category) were selected. In each plot, the macrofauna was collected manually in six 25x25x30 cm monoliths. Vegetation was sampled using the point intercept method. In the natural paramo, the community of soil macroinvertebrates is composed by 18 taxa from the phyla Nematoda, Mollusca, Annelida and Arthopoda, with an average density of 407 ind m-2 , a richness of 74 morphotypes and a diversity (N1. of Hill) of 12 morphotypes. Colleoptera, with 135 ind m-2 , was the dominant taxa followed by Diptera with 72 ind m-2 and Oligochaeta with 56 ind m-2 . The cultivation of the natural paramo has a negative effect on the community of soil macroinvertebrates, reducing its density, richness and diversity. After six years of succession, only the density is totally recovered. Characteristic morphotypes of each successional phase were found, that could be indicators of environmental quality and/or perturbation. A positive correlation between the number of soil fauna morphotypes and of plant species (r² = 0,53) and between soil fauna and plant diversity (N1 : r2 = 0,65; N2 : r2 = 0,75) was found.
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Copyright (c) 2002 Jimmy Morales, Lina Sarmiento (Author)
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