Mesofauna relacionada a la vegetación acuática en una laguna del valle del alto Paraná argentino

Resumen

This is a contribution to the knowledge of population structure of that mesofauna related to Paspalum repens and Salvinia herzogii. Samples have been colected in the Laguna Sirena channel monthly, in the period June 1979 - April 1980. It consisted of vegetation and associated fauna sampled with a 250 microns width mesh net. being the sampling area of 1 570 square cm.

Peaks of maximun abundance of mesofauna were registered in August 1979 and April 1980, and have been mainly caused by fluctuations in Copepoda, the most numerous group. Similar behaviour was performed by Cladocera.

Insecta and Acarina were the same in April. Diptera, chiefly Chironomidae, was a significant fraction of Insecta. Other orders less significant than Diptera, had only a few specimens. Although Planorbidae was the most abundant group of Mollusca. no dense concentrations of this family has been found.