SS1.09 Fisheries Population Linkage Spatial and Temporal Variation in Zooplankton
Date: Wednesday, June 12, 2002
Time: 3:00:00 PM
Location: Carson C
CarlJD, National Environmental Research Institute, Dept. of Lake and Estuarine Ecology, Silkeborg, Denmark,
Rasmussen, T, H, University of Aarhus, Dept of Marine Ecology , Aarhus, Denmark,
Hansen, K, W, University of Aarhus, Dept. of Marine Ecology, Aarhus, Denmark,
Andersen, B, , University of Aarhus, Dept. of Marine Ecology, Aarhus, Denmark,
Groenkjaer, P, , University of Aarhus, Dept. of Marine Ecology, Aarhus, Denmark,
Assessing Habitat Quality In Juvenile Flounder (Platichthys flesus L.) Nursery Areas In A Eutrophic Danish Fjord
Juvenile flounder (Platichthys flesus L.) utilize shallow coastal and estuarine areas as nursery habitats, which have been increasingly affected by eutrophication in recent times. Increased concentration of nutrients in the water and sedimentation of organic material have led to fish nursery habitats experiencing alterations in benthic food webs, greater accumulation and distribution of filamentous and mat forming annual algae, and changes in the epibenthic fauna composition. To investigate the consequences of these affects on the habitat quality of nursery areas for juvenile flounder, a series of studies were undertaken in 1999 and 2000 in an nutrient enriched Danish fjord. Juvenile flounder densities and distributions were determined within different habitats and analysed in relation to the biomass and distributions of benthic and epibenthic fauna, sediment structure, organic content and vegetation coverage. Juvenile flounder feeding ecology was examined in selected habitats, and habitat-specific growths rates were determined using enclosures and compared to the biomass of benthic macrofauna. Results will be presented and used to assess habitat quality in different nursery habitats within a nutrient enriched Danish fjord.