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Previously roles of physical factors and negative interactions In estuanne community organization have been emphasized Recent studies suggest however that promotive processes can be important in structuring some soft-substrate communities For this study patterns of faunal abundance small-scale (centmeters to decimeters) distribuhon and species association are evaluated to assess the relative importance of pos~tive species interactions or promohve processes in the regulation of an estuanne macrobenthic community Based on living positions and habits the dominant fauna collected in 70 box cores (0 06 in2) dunng a 13 mo period was class~fied into 5 malor funcbonal groups (1) large tube and burrow builders (2) small tube bullders (3) shallow burrowers (4) deep burrowers (5) epifaunal and tube or burrow coinhabitants Positive correlations were more common (up to 52 of pairwise comparisons of abundance among groups of species) than negative correlations (up to 6 " h ) Highest percentages of positive correlations were observed among Group 4 species (53 % ) and between Groups 1 and 4 (38 %) Highest percentages of negative correlat~ons occurred between Groups 2 and 1 (6 '10) The large tube-buildlng polychaete Chaetopterus vanopedatus d~rectly influenced organlsm abundance and species composltlon of near-surface fauna ( S 5 cm) Number of species diversity and faunal abundance were greater in samples that contained C vanopedatus than in samples that did not most organisms exhibihng enhanced abundances were livlng on the tube above the sediment-water interface The head-down feeding polychaete Macroclymene zonalls had no significant effect on species d~versity or organism abundance In near-surface sed~men t s These patterns of species abundance and assoc~ation suggest that b~ogenic alterahon of the sedimentary environment especially through sed~men t amehorahon and the provision of substrate modifies habitat availability and thereby provldes a positive mechanism by which organism abundance and community structure are Influenced

Small-scale organism distributions and patterns of species diversity: evidence for positive interactions in an estuarine benthic community