Relações entre distribuição e abundância de larvas de Trichoptera (Insecta), em córregos de cerrado no entorno do Parque Estadual da Serra de Caldas (Caldas Novas, estado de Goiás)
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Data
2005-03
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Resumo
Abundance-occupancy relationships of Trichoptera larvae,
estimated in two seasons, were compared to evaluate the following hypothesis: hydrologic
instability during the rain season is the main mechanism which reduces the magnitude of
these relationships in streams located in the Cerrado region, Centre-West of Brazil. The
larvae density was determined from 18 sampling stations in a region surrounding the Parque
Estadual da Serra de Caldas, Caldas Novas, Estado de Goiás, by Surber sampler. The distribution
of each taxon was given by the number of occurrences in the region. During the dry season
(July), a significant correlation between abundance-occupancy was detected (r =0.606; n =
20; P < 0.005). On the other hand, such relationships were not significant during rainy
periods. These results support the hypothesis that, during the periods of hydrological
stability, abundance and distribution patterns of Trichoptera were controlled by the
interaction of organisms tolerance and environment gradients. Besides, the relative
importance of stochastic and deterministic, acting on benthonic insects may be temporally
dependent.
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Relação distribuição-abundância, Trichoptera, Macroecologia, Cerrado, Distribution-abundance relationship, Macroecology, Cerrado
Citação
SHUVARTZ, Marilda; OLIVEIRA, Leandro Gonçalves; DINIZ FILHO, José Alexandre Felizola; BINI, Luis Maurício. Relações entre distribuição e abundância de larvas de Trichoptera (Insecta), em córregos de cerrado no entorno do Parque Estadual da Serra de Caldas (Caldas Novas, estado de Goiás). Acta Scientiarum. Biological Sciences, Maringá, v. 27, n. 1, p. 51-55, jan./mar. 2005.