Coastal Fish Ecology and Habitat Dynamics

Coastal fish ecology encompasses the study of how fish populations interact with the complex mosaic of nearshore habitats, including seagrass meadows, rocky reefs and estuarine nurseries. The dynamics of these habitats are driven by physical factors such as temperature, salinity and hydrodynamic connectivity, as well as by biotic processes including competition, predation and recruitment. Coastal zones serve as critical nursery grounds for many species, supporting life-history stages that determine adult abundance and broader food-web structure. Anthropogenic pressures – notably eutrophication, habitat modification and overfishing – combine with climate-driven changes to alter species composition, trophic interactions and ecosystem resilience. Emerging evidence emphasises the importance of spatial heterogeneity and temporal variability in shaping community responses, from local recovery following restoration measures to large-scale regime shifts. Understanding these interlinked processes is essential for sustainable management of fisheries, conservation of biodiversity and protection of ecosystem services at global and regional scales.

Research from Nature Portfolio

Recent studies have confirmed that spatial connectivity among predatory fish habitats bolsters resilience against shifts towards opportunistic mesopredators, particularly under varying top-predator pressures and rising temperatures; this underscores the combined influence of landscape configuration and local environmental drivers on ecosystem stability. Foundational work has also documented a spatially propagating regime shift in a large coastal system, where dominance transitioned from large predatory fish to small prey species along environmental gradients, revealing how feedbacks between prey predation and dispersal pathways can reinforce alternative community states.

Coastal Fish Ecology and Habitat Dynamics publication trend

The graph below shows the total number of articles in coastal fish ecology and habitat dynamics across all publications each year (not limited to Nature Index journals).

Technical terms

Connectivity: The degree to which habitat patches are linked by the movement of organisms or the flow of materials, influencing recolonisation and genetic exchange.

Regime shift: A large, prolonged change in the structure or function of an ecosystem, often characterised by alternative stable states maintained by reinforcing feedbacks.

Mesopredator: A mid-trophic-level predator that feeds on smaller prey but is itself prey for larger top predators, and whose abundance can surge when top-predator pressure is reduced.

Eutrophication: The process by which water bodies become enriched with nutrients, typically nitrogen and phosphorus, leading to excessive plant and algal growth and altered community dynamics.

Nursery habitat: Shallow or sheltered areas that provide shelter and abundant food resources for juvenile fish, crucial for early-life survival and population replenishment.

References

1. Predation and spatial connectivity interact to shape ecosystem resilience to an ongoing regime shift. Nature Communications (2024).
2. A spatial regime shift from predator to prey dominance in a large coastal ecosystem. Communications Biology (2020).
3. Autonomous data sampling for high-resolution spatiotemporal fish biomass estimates. Ecological Informatics (2024).
4. Fish community responses to restoration of a eutrophic coastal bay. Ambio (2023).
5. Increases of opportunistic species in response to ecosystem change: the case of the Baltic Sea three-spined stickleback. ICES Journal of Marine Science (2022).