Eelgrass shoot density measured through a multi-factorial in situ experiment of 10 weeks in a eelgrass bed in St. Lawrence Estuary (Baie-Saint-Ludger, Canada)

We evaluated single and interactive effects of shading and sediment nutrient enrichment on the response of Zostera marina L. shoot density. Shoot density was evaluated using counts from three hoops of 20-cm diameter. Shoot density was measured before starting the experiment (T0), five weeks after the start of the experiment (T2) and at the end of the experiment after ten weeks (T3).