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Daily zooplankton samples were obtained from the Etang de Thau, France, a 70 km2 coastal lagoon of the northwestern Mediterranean Sea. The survey was monitored at 2 stations inside the lagoon and at 1 station on the seaside during 4 periods in 1994. The microzooplankton, towed with a 40 pm mesh size net, included tintinnids, rotifers, anthozoan larvae, and crustacean and mollusk larvae. The tintinnids and rotifers have not been studied in the lagoon yet. Over all the sampling periods, their mean biomass represented between 26 and 4 5 YO of the net collected mlcrozooplankton biomass, which was estimated by image analysis. Their biomass in the central part of the lagoon free of anthropic activity was close to the level observed at the nearby seaside. However, at the shellfish culture area, the occurrence of oysters and of epibiotic fauna resulted in a drastic biomass reduction of these taxocoenoses by a factor of 10 compared to values measured in the middle of the lagoon. Samples collected during the fall indicated well-developed tintinnid and rotifer populations in this season. lnside the lagoon these populations seemed to be already abundant in early spring (March and June samples). An ordination of taxa biomasses showed 2 main factors which might have contributed to the organization of the tintinnid and rotifer assemblages: the geographical position and the thermal period. The geographical position integrated the lagoon-sea water exchange. The thermal period reflected both the populations' development cycles and the env~ronmental constraints. The resulting effects appeared in assemblages structured in a space and time gradient. The capacity of the tintinnids and rotifers to quickly colonise the habitat (reproduction modes, resistance forms) and to use a wide range of food resources (organic matter, bacteria, picoand nanoplankton) likely enhances their ability to serve as trophic links between primary and secondary producers. Hence, their function in the lagoon ecosystem is not minor.

Tintinnids and rotifers in a northern Mediterranean coastal lagoon. Structural diversity and function through biomass estimations