Nutrient and Eutrophication Dynamics in Coastal Ecosystems

Coastal ecosystems occupy a critical interface between terrestrial and marine realms, where nutrient inputs from rivers, atmospheric deposition and human activities converge to influence biological productivity, water quality and biogeochemical cycling. Excess nitrogen and phosphorus can fuel primary production, leading to phytoplankton blooms that alter food-web structure, reduce water clarity and, upon decay, precipitate oxygen depletion in bottom waters. The interplay of physical transport, residence time, sediment interactions and biological uptake shapes the timing and magnitude of eutrophication responses. Climatic factors such as warming, altered precipitation patterns and sea-level rise further modulate nutrient fluxes and stratification, exacerbating hypoxia events in stratified basins. Effective management demands an integrated perspective on nutrient sources, in-system transformations and downstream impacts, linking catchment practices to coastal water quality. Recent advances in process-based modelling, long-term monitoring and novel statistical approaches have improved predictions of nutrient fate and ecosystem thresholds. Moreover, emerging indicators of stoichiometric balance, community network resilience and early warning signals offer practical tools for managers to design nutrient-reduction strategies, mitigate harmful algal blooms and restore oxygen levels in vulnerable coastal zones.

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Nutrient and Eutrophication Dynamics in Coastal Ecosystems publication trend

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Technical terms

Nutrient loading: The total quantity of nutrients, principally nitrogen and phosphorus, delivered to a water body over a given period, including both point and diffuse sources.

Eutrophication: The process by which a water body becomes enriched with nutrients, stimulating excessive primary production and often resulting in oxygen depletion and ecological imbalance.

Hypoxia: A condition in which dissolved oxygen concentrations fall below levels necessary to support most aerobic organisms, typically defined as less than 2 mg L⁻¹.

Nutrient stoichiometry: The ratio of key nutrients, especially nitrogen to phosphorus (N:P), which influences the composition of phytoplankton communities and the intensity of eutrophication responses.

Harmful algal blooms (HABs): Rapid proliferations of algae, often dominated by toxin-producing species, that can impair water quality, threaten human and ecosystem health, and disrupt fisheries and recreation.

References

1. Weighted Regressions on Time, Discharge, and Season (WRTDS), with an Application to Chesapeake Bay River Inputs1. JAWRA Journal of the American Water Resources Association (2010).
2. Global riverine N and P transport to ocean increased during the 20th century despite increased retention along the aquatic continuum. Biogeosciences (2016).
3. The Haber Bosch–harmful algal bloom (HB–HAB) link. Environmental Research Letters (2014).