Biogeochemical Cycling and Sediment Ecology (Nato Science Partnership Subseries: 2, 59)

Oceanographic discontinuities (e. g. frontal systems, upwelling areas, ice edges) are often areas of enhanced biological productivity. Considerable research on the physics and biology of the physical boundaries defining these discontinues has been accomplished (see [I D. The interface between water and sediment is the largest physical boundary in the ocean, but has not received a proportionate degree of attention. The purpose of the Nato Advanced Research Workshop (ARW) was to focus on soft-sediment systems by identifying deficiencies in our knowledge of these systems and defining key issues in the management of coastal sedimentary habitats. Marine sediments play important roles in the marine ecosystem and the biosphere. They provide food and habitat for many marine organisms, some of which are commercially important. More importantly from a global perspective, marine sediments also provide "ecosystem goods and services" [2J. Organic matter from primary production in the water column and contaminants scavenged by particles accumulate in sediments where their fate is determined by sediment processes such as bioturbation and biogeochemical cycling. Nutrients are regenerated and contaminants degraded in sediments. Under some conditions, carbon accumulates in coastal and shelf sediments and may by removed from the carbon cycle for millions of years, having a potentially significant impact on global climate change. Sediments also protect coasts. The economic value of services provided by coastal areas has recently been estimated to be on the order of $12,568 9 10 y" [3J, far in excess of the global GNP. Front Matter....Pages i-xii Geochemistry of Organic Carbon in the Ocean....Pages 1-27 Primary Production and Decomposition of Organic Matter in Coastal Areas of the Northern Aral Sea, with Special Reference to Land-Sea Interactions....Pages 29-48 Biogeochemistry of Water and Sediment in the OB and Yenisey Estuaries....Pages 49-68 The Continental-Ocean Boundary as a Marginal Filter in the World Oceans....Pages 69-103 Unjustifiably Ignored: Reflections on the Role of Benthos in Marine Ecosystems....Pages 105-124 Understanding Small-Scale Processes Controlling the Bioavailability of Organic Contaminants to Deposit-Feeding Benthos....Pages 125-136 The Role of the Marine Gastropod Cerithium Vulgatum in the Biogeochemical Cycling of Metals....Pages 137-146 Changes in Macrozoobenthos Communities Induced by Anthropogenic Eutrophication of the Gulf of Gdansk....Pages 147-152 Do Benthic Animals Control the Particle Exchange between Bioturbated Sediments and Benthic Turbidity Zones?....Pages 153-159 Impact of Catchment Land-Use on an Estuarine Benthic Food Web....Pages 161-171 Natural Variability and the Effects of Fisheries in the North Sea: Towards an Integrated Fisheries and Ecosystem Management?....Pages 173-184 Community Compositon of Tidal Flats on Spitsbergen: Consequence of Disturbance?....Pages 185-193 The Problem of Scale: Uncertainties and Implications for Soft-Bottom Marine Communities and the Assessment of Human Impacts....Pages 195-210 Understanding the Sea Floor Landscape in Relation to Impact Assessment and Environmental Management in Coastal Marine Sediments....Pages 211-227 Conclusions and Recommendations....Pages 229-232 Back Matter....Pages 233-236 The present book represents a unique survey of recent Russian research on element cycling in the ocean, with new data on the Aral Sea. It takes the form of a broad-scale review of organic matter cycling in the world's oceans and in particular the working of marginal filters. An up-to-date survey of sediment ecology and key aspects, such as spatial scaling, the effect of nutrients and trawling in benthic systems Proceedings of the NATO Advanced Research Workshop on Biochemical Cycling in Marine Sediments, held in Hel, Poland, August 1997