Distribution and trophic functioning of planktonic communities in coastal marshes in Atlantic Coast of France

Coastal marshes are submitted to huge management due anthropogenic pressure and thus, it is essential preserve their biodiversity, ecological functions the ecosystem services they can provide. This study investigates diversity abundance of planktonic communities (heterotrophic prokaryotes, heterotrophic protists, microphytoplankton metazooplankton). The aim this provide a first quantitative inventory on plankton present in two construct different typologies food webs these marches. Seasonal samplings (4) for environmental variables, nutrient concentrations were conducted at 2–3 stations each marsh during year. A total five types web determined, three them found both marshes. saltmarsh phytoplanktonic dominated by Cryptophyta, nanoflagellates Cyanobacteria. freshwater was Cryptophyta autumn winter diverse phytoplankton community spring. Marine copepods (Calanoida Harpacticoida) characterized saltwater metazooplanktonic communities, Cladocerans Rotifera ones. Overall, higher (102 taxa) than (54 taxa). Phytoplankton blooms represented CO2 uptake reification function seemed most efficient saltmarsh. Considerable zooplankton potential nursery. Of actions performed, only periodic water renewals might affect seasonal dynamics communities.