The dataset contains abundance and body size data of the benthic macroinvertebrates communities of 12 coastal lagoons located in five different countries (Italy, Albania, Greece, Bulgaria and Romania). Data refer to 262 taxa and 53637 individuals.

The dataset contains taxonomic and body size data of benthic macroinvertebrates collected during the spring 2005 in 15 Mediterranean and Black Sea transitional water ecosystems. Data refer to 188 taxa and 34492 individuals.