Eutrophication in Planktonic Ecosystems: Food Web Dynamics and Elemental Cycling: Proceedings of the Fourth International PELAG Symposium, held in Helsinki, Finland, 26–30 August 1996

Front Matter....Pages i-viii
Interactions of top-down and bottom-up control in planktonic nitrogen cycling....Pages 1-12
Population regulation and role of mesozooplankton in shaping marine pelagic food webs....Pages 13-27
Retention versus export food chains: processes controlling sinking loss from marine pelagic systems....Pages 29-57
A theoretical approach to structuring mechanisms in the pelagic food web....Pages 59-72
30 years’ eutrophication in shallow brackish waters — lessons to be learned....Pages 73-79
Relations between planktivorous fish abundance, zooplankton and phytoplankton in three lakes of differing productivity....Pages 81-95
Planktonic food web in marine mesocosms in the Eastern Mediterranean: bottom-up or top-down regulation?....Pages 97-105
Coupling of autotrophic and heterotrophic processes in a Baltic estuarine mixing gradient (Pomeranian Bight)....Pages 107-115
Variability of nutrient limitation in the Archipelago Sea, SW Finland....Pages 117-126
Effects of environmental factors on the phytoplankton community in the Gulf of Finland — unattended high frequency measurements and multivariate analyses....Pages 127-139
On the production, elemental composition (C, N, P) and distribution of photosynthetic organic matter in the Southern Black Sea....Pages 141-156
Elemental composition of seston and nutrient dynamics in the Sea of Marmara....Pages 157-167
Impact of increased river discharge on the phytoplankton community in the outer Oslofjord, Norway....Pages 169-177
Vertical migration of autotrophic micro-organisms during a vernal bloom at the coastal Baltic Sea — coexistence through niche separation....Pages 179-189
Group-specific phytoplankton biomass/dissolved carbohydrate relationships in the Gulf of Trieste (Northern Adriatic)....Pages 191-205
The use of spectral fluorescence methods to detect changes in the phytoplankton community....Pages 207-217
The budgets of nitrogen and phosphorus in shallow eutrophic Lake Võrtsjärv (Estonia)....Pages 219-227
Vertical and seasonal distributions of micro-organisms, zooplankton and phytoplankton in a eutrophic lake....Pages 229-240
Biochemical composition of particulate organic matter and bacterial dynamics at the sediment—water interface in a Mediterranean seagrass system....Pages 241-251
Development of microbial community during Skeletonema costatum detritus degradation....Pages 253-260
Nutrient composition, microbial biomass and activity at the air-water interface of small boreal forest lakes....Pages 261-270
Seasonal and spatial distribution of bacterial production and biomass along a salinity gradient (Northern Adriatic Sea)....Pages 271-282
Incorporation of spatial structure into the analysis of relationships between environment and marine microbiological parameters....Pages 283-288
Biomass and feeding activity of phagotrophic mixotrophs in the northwestern Black Sea during the summer 1995....Pages 289-301
Spatial structure and ecological efficiency in the summer zooplankton of a glacial lake....Pages 303-307
Nitrogen, phosphorus and Daphnia grazing in controlling phytoplankton biomass and composition — an experimental study....Pages 309-321
 In situ grazing pressure and diel vertical migration of female Calanus euxinus in the Black Sea....Pages 323-332
Zooplankton-phytoplankton interactions: a possible explanation of the seasonal succession in the Kuršiu Marios lagoon....Pages 333-339
Closing address: perspectives on basic and applied, freshwater and marine pelagic research....Pages 341-344