Community Dynamics in Rocky Intertidal Ecosystems

Rocky intertidal zones represent unique interfaces between marine and terrestrial environments, where organisms contend with alternating submergence and exposure, steep environmental gradients and frequent disturbances. Community dynamics in these habitats are governed by zonation patterns, successional processes and the actions of foundation species such as barnacles, mussels and macroalgae, which modify habitat structure and facilitate other organisms. Biotic interactions – including competition, predation and facilitation – are tightly coupled to abiotic factors such as wave energy, temperature and sea-level variability. Disturbance regimes, whether from storms, heatwaves or human activity, reset successional stages and influence species composition and resilience. Understanding these dynamics is vital for predicting how intertidal communities will respond to climate change, sea-level rise and shifting disturbance intensities, and for guiding conservation and resource management across diverse coastlines worldwide.

Research from Nature Portfolio

Recent work has demonstrated that extreme climatic events can drive mid-shore assemblages towards early successional stages more profoundly than clusters of mild disturbances. Experimental simulations of intense storm impacts removed late-successional macroalgae and invertebrates, delaying community maturation and favouring opportunistic species. These findings highlight the importance of disturbance intensity in structuring intertidal communities and suggest that increasing frequency of extreme storms under climate change may induce persistent alterations in community trajectories and ecosystem function.

Community Dynamics in Rocky Intertidal Ecosystems publication trend

The graph below shows the total number of articles in community dynamics in rocky intertidal ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Intertidal zone: The coastal area between high and low tide marks, periodically submerged and exposed to air.

Zonation: Distribution of organisms in distinct horizontal bands along the intertidal gradient according to environmental tolerance.

Successional stage: Phase in community development following disturbance, from early colonisers to mature assemblages.

Foundation species: Organism that creates or modifies habitat structure and strongly influences community composition.

Trophic interaction: Feeding relationship among organisms, encompassing predation, herbivory and competition.

Facilitation: Positive ecological interaction in which one species ameliorates conditions for another.

References

1. Vertical Distribution of Rocky Intertidal Organisms Shifts With Sea‐Level Variability on the Northeast Pacific Coast. Global Change Biology (2024).
2. Influence of a changing wave climate on the quality and morphometry of the stalked barnacle Pollicipes pollicipes (Gmelin, 1789), along the coasts of NW Iberia. Reviews in Fish Biology and Fisheries (2024).
3. Changes in Rocky Intertidal Community Structure During a Marine Heatwave in the Northern Gulf of Alaska. Frontiers in Marine Science (2021).
4. Climate extremes can drive biological assemblages to early successional stages compared to several mild disturbances. Scientific Reports (2016).