Hydrological Responses to Climate Change in Aquatic Ecosystems

Climate change is reshaping the water cycle across lakes, rivers, wetlands and aquifers, driving profound shifts in flow regimes, storage dynamics and water quality. Rising temperatures intensify evapotranspiration, reducing surface water availability and lowering lake levels, while altered precipitation patterns produce more erratic streamflow and extended droughts. Extreme events such as intense storms and floods exacerbate sediment mobilisation, nutrient loading and habitat disruption. Aquatic ecosystems respond through altered seasonal flow timing, contraction of wetted areas and changes to thermal stratification, which in turn affect biodiversity and biogeochemical cycling. In coastal and inland wetlands, diminishing inflows can transform hydrogeomorphological processes and impair ecosystem services such as flood attenuation and water purification. Groundwater systems face declining recharge rates under warmer, drier conditions, compromising baseflows that sustain surface waters during dry spells. Modelling frameworks that combine regional climate projections with distributed hydrological models are essential to predict future water balances, assess vulnerability and guide adaptive management. Integrated approaches now incorporate land-use change, sediment transport and socio-economic scenarios to inform resilient water-resource strategies. This synthesis highlights the global significance of hydrological responses to climate change and underscores the urgent need for coordinated monitoring, forecasting and intervention to safeguard aquatic ecosystems and the services upon which societies depend.

Research from Nature Portfolio

Recent analyses of long-term groundwater records in an arid region reveal a marked decline in annual recharge rates of approximately 3.8 mm yr⁻¹ over two decades. This trend is shown to result from the combined effects of unsustainable abstractions and shifts towards warmer, drier climate regimes. The work underscores the dominant role of human water use in driving aquifer depletion, even where climatic factors contribute to reduced replenishment.

Advanced modelling of a temperate wetland catchment using a semi-distributed watershed tool has quantified the impacts of future climate scenarios and land-cover change on streamflow and sediment yield. Under higher-emission pathways, reductions in precipitation and increasing temperatures lead to lower inflow volumes, while concurrent deforestation and urban expansion elevate sediment loads. The study projects substantial wetland infilling by century’s end in the absence of targeted land-use controls and adaptive inflow management.

Hydrological Responses to Climate Change in Aquatic Ecosystems publication trend

The graph below shows the total number of articles in hydrological responses to climate change in aquatic ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Groundwater recharge: The process by which precipitation and surface water percolate through soil and rock to replenish aquifers.

Streamflow: The volume of water moving through a river channel per unit time, influenced by precipitation, runoff and baseflow.

Sediment load: The total mass of mineral and organic material transported by flowing water, affecting geomorphology and water quality.

Environmental inflow: Managed water allocations released into aquatic systems to maintain ecological functions and habitats.

Shared Socio-economic Pathway (SSP): A scenario framework describing future trajectories of demographic, economic and technological change that influence greenhouse-gas emissions and climate outcomes.

References

1. Decline in Iran’s groundwater recharge. Nature Communications (2023).
2. Modelling impacts of climate change and anthropogenic activities on inflows and sediment loads of wetlands: case study of the Anzali wetland. Scientific Reports (2023).
3. Predicting the hydraulic response of critical transport infrastructures during extreme flood events. Engineering Applications of Artificial Intelligence (2024).
4. Climate-informed environmental inflows to revive a drying lake facing meteorological and anthropogenic droughts. Environmental Research Letters (2018).