Macrobenthic Community Changes Related to Eutrophication inPalude della Rosa(Venetian Lagoon, Italy)

摘要: Abstract Changes in macrozoobenthic communities were studied a shallow eutrophic basin known as the Palude della Rosa Venetian lagoon, Italy. The sampling was conducted on monthly basis from December 1991 to July 1993 at four representative stations. observed fluctuations of benthic community structure closely followed seasonal cycle green macroalga Ulva rigida C. Ag., and its overgrowth. Sediment enrichment organic matter, due this algal overgrowth, modified environmental conditions, leading anoxic crisis over summer. Significant differences composition diversity found between those stations that heavily influenced by presence less influenced. All species strongly affected crisis; so much macrofauna almost disappeared. This period then recolonization phase devoid bottom. Such took place following winter, pattern similar other studies elsewhere. structural changes analysed means univariate multivariate techniques.