Climate Change Impact on Marine Fish Communities

Marine fish communities are experiencing widespread reorganisation in response to anthropogenic climate change. Rising sea temperatures, shifts in salinity and reductions in oxygen levels are driving poleward and depth-related redistributions of species, leading to changes in community composition, trophic dynamics and overall biomass. Warm-affinity species are expanding into formerly cooler regions, while cold-water specialists contract or face local extirpation. Such shifts alter predator-prey interactions, affect reproductive timing and growth rates, and influence fisheries productivity. Observations over recent decades indicate declines in biomass of key Arctic species and structural changes in temperate shelf assemblages, with potential knock-on effects for food security and coastal economies. Future projections under different emissions scenarios forecast continued range expansions of fast-living species, loss of climate-sensitive stocks, and emergence of new climate refugia, emphasising the need for adaptive management, spatial planning and ecosystem-based conservation to maintain resilience and sustainable use of marine resources.

Research from Nature Portfolio

Recent studies have fitted joint species distribution models to extensive trawl survey data, projecting biomass and richness changes under mid- and high-emission scenarios. Projections indicate overall increases in species richness at higher latitudes but declines in relative dominance and biomass of polar demersal fishes, with some species at high risk of local extinction by the end of the century in the absence of climate refugia. Another seminal analysis of global bottom-trawl surveys has employed a trait-based framework to reveal a fast–slow life-history continuum in marine fishes. This work demonstrated that traits related to growth, maturation and lifespan strongly correlate with environmental gradients, predicting that warming will favour fast-living species and reshape community trait compositions across continental shelf seas.

Climate Change Impact on Marine Fish Communities publication trend

The graph below shows the total number of articles in climate change impact on marine fish communities across all publications each year (not limited to Nature Index journals).

Technical terms

Joint species distribution model: A statistical framework that relates species occurrences or abundances to environmental variables to predict community structure and future distributions under changing conditions.

Thermal niche: The range of temperatures within which a species can survive, grow and reproduce, often determining its geographic distribution and vulnerability to warming.

Demersal: Referring to fish that live and feed on or near the seabed, in contrast to pelagic species inhabiting the water column.

Trait-based approach: An ecological method that examines species’ functional characteristics (e.g. growth rate, lifespan) to understand community responses to environmental change.

Climate refugia: Areas that remain relatively buffered from climate change effects, providing safe havens for species threatened elsewhere by warming and other stressors.

References

1. Future trends of marine fish biomass distributions from the North Sea to the Barents Sea. Nature Communications (2024).
2. Marine fish traits follow fast-slow continuum across oceans. Scientific Reports (2019).
3. Sea temperature is the primary driver of recent and predicted fish community structure across Northeast Atlantic shelf seas. Global Change Biology (2023).
4. Climate change projections of commercial fish distribution and suitable habitat around north western Europe. Fish and Fisheries (2023).
5. Community’s ecological traits reflect spatio-temporal variability of climate change impacts. Environmental and Sustainability Indicators (2024).