Ecohydrology
Summary
Ecohydrology examines the reciprocal interactions between water dynamics and ecological processes, with a focus on systems driven by subsurface water. Groundwater-dependent ecosystems—such as springs, wetlands and riparian woodlands—rely on aquifer discharge to sustain baseflow, regulate microclimates and support specialised biodiversity. Research combines isotope hydrology, geochemical tracing, hydrodynamic modelling and ecological surveys to characterise recharge, storage and discharge patterns and to map species–habitat relations. Human pressures—including over-extraction, land-use change and pollution—alongside shifting precipitation regimes and rising temperatures, threaten these systems by altering groundwater levels and flow paths. Integrating ecohydrological insights into resource management and conservation planning is essential to safeguard ecosystem services and maintain both water security and ecological integrity in a changing climate.
Research from Nature Portfolio
Mapping groundwatersheds of protected areas revealed that 85 per cent of sites harbouring groundwater-dependent ecosystems have subsurface catchments extending beyond their boundaries, exposing them to unregulated abstraction, contamination and land-use change. Delineation of these groundwatersheds underscores the need for basin-scale conservation measures that transcend surface boundaries. In a separate study, analysis of ecosystem services in an urbanising agricultural watershed showed nonlinear sensitivity to water table depth: small declines in shallow groundwater (<2.5 m) produced disproportionate losses in flood control, water quality, food production and recharge, highlighting critical depth thresholds for ecosystem resilience and informing strategic groundwater management.
Ecohydrology publication trend
The graph below shows the total number of articles in ecohydrology across all publications each year (not limited to Nature Index journals).
Technical terms
Ecohydrology: The interdisciplinary study of interactions between hydrological processes and ecological functions within ecosystems.
Groundwater-Dependent Ecosystem (GDE): A habitat or community whose structure and function depend on sustained inputs of subsurface water.
Aquifer: A permeable geological formation capable of storing and transmitting significant quantities of groundwater.
Recharge: The process by which water infiltrates the soil and unsaturated zone to replenish aquifer storage.
Seepage: The gradual emergence of groundwater at the land surface, sustaining wetlands, springs or baseflow in streams.
Baseflow: The component of streamflow contributed by groundwater discharge, providing sustained flow during dry periods.
References
- Overlooked risks and opportunities in groundwatersheds of the world’s protected areas. Nature Sustainability (2023).
- Nonlinear groundwater influence on biophysical indicators of ecosystem services. Nature Sustainability (2019).
- Distribution, threats and protection of selected karst groundwater-dependent ecosystems in the Mediterranean region. Hydrogeology Journal (2023).
- Quantification of anthropogenic impact on groundwater-dependent terrestrial ecosystem using geochemical and isotope tools combined with 3-D flow and transport modelling. Hydrology and Earth System Sciences (2015).
About these summaries
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