Coastal Ecosystem Dynamics in the North Sea

The North Sea coastline encompasses a mosaic of habitats—from shallow intertidal flats and barrier-protected basins to deeper shelf waters—where physical, chemical and biological processes interact on seasonal to multi-decadal timescales. Wind and tidal forcing drive mixing and stratification, while riverine inputs regulate salinity gradients and nutrient loads. Nutrient enrichment has historically led to eutrophication, altering phytoplankton biomass and community composition and triggering shifts in nutrient limitation from silicate to phosphorus. Climatic trends, notably warming and increased frequency of marine heatwaves, have modified thermal stratification patterns, enhanced spring bloom intensity nearshore and contributed to deoxygenation in bottom layers. Shifts in plankton functional traits and bentho-pelagic coupling illustrate how ecological regime changes may not always coincide with taxonomic turnover. Together, these dynamics underpin primary production, carbon export and biodiversity, with direct implications for fisheries, coastal carbon sequestration and ecosystem-based management under a changing climate.

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Coastal Ecosystem Dynamics in the North Sea publication trend

The graph below shows the total number of articles in coastal ecosystem dynamics in the north sea across all publications each year (not limited to Nature Index journals).

Technical terms

Stratification: vertical layering of water masses due to density differences, which regulates nutrient and oxygen exchange.

Eutrophication: nutrient enrichment of water bodies leading to excessive algal growth and potential oxygen depletion.

Primary production: synthesis of organic matter by photosynthetic organisms, forming the base of the marine food web.

Deoxygenation: decline in dissolved oxygen concentrations, often in bottom waters, compromising habitat quality.

Mesozooplankton: small drifting animals (e.g. copepods) that transfer energy from phytoplankton to higher trophic levels.

References

1. An evaluation of long-term physical and hydrochemical measurements at the Sylt Roads Marine Observatory (1973–2019), Wadden Sea, North Sea. Earth System Science Data (2023).
2. Effects of the 2018 European heatwave and drought on coastal biogeochemistry in the German Bight. The Science of The Total Environment (2023).
3. Reinterpreting two regime shifts in North Sea plankton communities through the lens of functional traits. Global Ecology and Biogeography (2023).
4. Multi-model comparison of trends and controls of near-bed oxygen concentration on the northwest European continental shelf under climate change. Biogeosciences (2024).