Comunidade de aranhas em capões de mata das sub-regiões Miranda e Abobral no Pantanal Sul-Mato-grossense

AUTOR(ES)

Josue Raizer.

DATA DE PUBLICAÇÃO

2004

RESUMO

In the present study, the spider community structure in vegetated earthmounds locally known as capões, in the Miranda and Abobral sub-regions of the southern Pantanal (Mato Grosso do Sul, Brazil), was characterized and evaluated for environmental effects related to spatial and temporal variations. Records for the spider community were done through five sampling methods (nocturnal hand collecting, beating sheet, pitfall trap, ground eclector, and trunk eclector). Sampling was conducted on a monthly basis, from July 1998 to November 1999. The environmental variables spatially analyzed were size, vegetation complexity, and flood possibility in the capões, whereas temperature, rainfall, and flooding were temporally analyzed. Community structure was represented by the distribution of abundances, species richness, and species composition. For both approaches (spatial and temporal), only the composition of spider species was significantly affected by the environmental variables. Flood possibility in the capões was the only spatial variable to explain significantly the structure of the spider community when all the sampling methods were jointly analyzed. The effect of this variable was predominant on the composition of wandering ground spider species. When pitfall-trap captures alone were taken into account, the relationship between vegetation complexity and spider community structure was found to be significant. During a one-year period, temperature and rainfall contributed significantly to alter the spider species composition, shaping a pattern of species turnover. Flooding, as determined by the level of the Miranda river, affected the composition of spider species. Changes in the spatial distribution of spider species also seemed to be important for the community, as a way of minimizing the consequences of a possible increase in spider density due to the flooding of fields.

ASSUNTO(S)

artropode comunidades animais

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