Ecosystem Dynamics and Fisheries Management in Mediterranean Marine Systems

The Mediterranean Sea represents a biogeographically complex and historically exploited marine region, characterised by high biodiversity, pronounced environmental gradients and intense human pressure. Ecosystem dynamics in this semi-enclosed basin are shaped by bottom-up processes such as nutrient-driven primary productivity, and top-down forces including intense fishing pressure, invasive species introductions and climate-driven warming. Trophic interactions have been altered by the disproportionate removal of predatory species, leading to shifts in community structure and energy flow. Meanwhile, small-scale artisanal fisheries operate alongside large trawl fleets, creating spatially heterogeneous impacts on habitats and target stocks. Effective fisheries management in the Mediterranean demands an ecosystem-based approach that integrates stock assessments, ecological indicators and adaptive governance frameworks across national jurisdictions. Emerging tools such as food-web modelling, habitat mapping and machine-learning vulnerability assessments are increasingly applied to inform measures that can reconcile conservation goals with socio-economic imperatives, while mitigating the combined effects of climate change, pollution and biodiversity loss.

Research from Nature Portfolio

Recent studies have shown that long-term trends in Mediterranean ecosystem structure are driven primarily by variations in primary productivity, with fishing pressure exerting a secondary yet still substantial influence on species abundances and trophic organisation. Food-web models covering the period 1950–2011 reveal a persistent decline in commercially important fish and top predators, concurrent with increases in lower-trophic-level biomass and overall ecosystem degradation. Building on these insights, scenario analyses for the Eastern Mediterranean continental shelf demonstrate that reductions in fishing effort can yield immediate benefits for resource recovery, but that these gains may be offset when rising sea temperatures and expanding alien species are considered together. This work underscores the need for integrated management strategies that address multiple stressors and promote resilience in a rapidly changing basin.

Ecosystem Dynamics and Fisheries Management in Mediterranean Marine Systems publication trend

The graph below shows the total number of articles in ecosystem dynamics and fisheries management in mediterranean marine systems across all publications each year (not limited to Nature Index journals).

Technical terms

Ecosystem-based management: An integrated approach that considers ecological relationships, human uses and environmental drivers to sustain ecosystem health and services.

Primary productivity: The rate at which photosynthetic organisms convert inorganic carbon into organic biomass, forming the energy base of marine food webs.

Trophic level: The position of an organism within a food web, indicating its source of energy and predation relationships.

By-catch: The incidental capture of non-target species during fishing operations, often leading to additional mortality and ecosystem impacts.

Food-web model: A quantitative representation of energy and matter flows among species and functional groups, used to assess ecosystem responses to perturbations.

References

1. Historical changes of the Mediterranean Sea ecosystem: modelling the role and impact of primary productivity and fisheries changes over time. Scientific Reports (2017).
2. Future scenarios of marine resources and ecosystem conditions in the Eastern Mediterranean under the impacts of fishing, alien species and sea warming. Scientific Reports (2018).
3. The Mediterranean and Black Sea Fisheries at Risk from Overexploitation. PLOS ONE (2015).
4. Factors Influencing Endangered Marine Species in the Mediterranean Sea: An Analysis Based on IUCN Red List Criteria Using Statistical and Soft Computing Methodologies. Environments (2024).
5. ‘Reported’ versus ‘likely’ fisheries catches of four Mediterranean countries. Scientia Marina (2014).