Study of the oribatid mite (Acari: Oribatida) community from two patches of tala (Celtis ehrenbergiana) from the southern of Buenos Aires
DOI:
https://doi.org/10.25260/EA.16.26.3.0.198Abstract
Study of the oribatid mite (Acari: Oribatida) community from two patches of tala (Celtis ehrenbergiana) from the southern of Buenos Aires. “Talares” are xeric forests located along the coast of Buenos Aires province, Argentina. Since >400 years ago, they have been subject of a severe degradation, resulting in a fragmentary landscape of forest patches surrounded by a grassland matrix. The aims of this study were: a) to enhance the knowledge of oribatid mites in the talares, and b) to analyze the effect of habitat fragmentation on diversity, richness, abundance and structure of the oribatid mite community. I analyzed oribatids in three sites: two different-size close forest patches (big: Gr, small: Ch) and the surrounded grassland matrix (Ma) in Laguna de los Padres reserve, Mar del Plata. A total of 51 species of oribatids were identified, with similar values of richness in all sites. Oppiidae y Scheloribatidae were the families with more species. Diversity (H’) was greater in the forest patches (Gr=1.58; Ch=1.59) than in the matrix (Ma=0.91). Density of oribatid mites was higher in Gr (36500 individuals/m2); in Ch and Ma, densities were 50% and 75% lower. This global difference is a consequence of reduced population sizes in most species. According to seasonal variations, in Gr there were more “ubiquitous” species (20) than in Ch y Ma (10). Summarizing, the community of oribatid mites were primarily conditioned by the type of environment (grassland vs. forest), with similar distribution patterns of species but with a marked seasonality in the grassland matrix. Among forest patches, area did affect oribatid mites density through a reduction in most population sizes. The evaluation of the fragility of these populations could be a starting point to undertake conservation programs.References
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