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Modeling the distribution patterns of the estuarine macrobenthic community has revealed itself as a difficulttask due to spatio-temporal heterogeneity. This study uses ordinary kriging and Poisson modeling to generate distributionmaps of the subtidal benthic macrofauna in the Trapandé Bay (southeastern Brazil). Samples were taken in duplicatefrom 36 locations distributed along nine transects perpendicular to the main estuarine axis in October 2006 andMarch 2007. One-hundred and seventy taxa belonging to 12 phyla, were identified, with dominance of AnnelidaPolychaeta. Distribution maps were prepared to illustrate the total density, the number of species and the six mostnumerous taxa, as well as abiotic parameters. The general distribution pattern has revealed that the greatest number ofspecies and the highest densities are at the estuary mouth, decreasing towards its inner areas. However the temporaland spatial changes observed at the estuary mouth have clearly shown the impact of environmental variations such asnutrients and freshwater input, attributed to increased rainfall in March. The increased flow in the Cananeia Sea, comingfrom the drainage basin, produces major changes in sediment and faunal composition. Ordinary kriging associatedwith Poisson modeling has proved to be a powerful and promising tool for modeling the macrofauna, despite the factthat it is not frequently used due to the scarcity of appropriate software

zoologia

The spatial distribution of the subtidal benthic macrofauna and its relationship with environmental factors using geostatistical tools: a case study in Trapandé Bay, southern Brazil