Integrating hydrological, biogeochemical, and ecological perspectives is essential to understand spatial and temporal dynamics of biogeochemical processes and ecosystem functioning in freshwater, and their emergent responses and sensitivity to a rapidly changing climate. Hydrological processes shape terrestrial-aquatic connectivity within catchments, with cascading effects on aquatic ecosystems through the mobilization and transport of chemical elements and organic compounds, as well as the dispersal of organisms. On the other hand, biota influences hydrological processes through mechanisms such as tree transpiration and ecosystem engineering, while regulating the biogeochemical cycling of carbon, nutrients, metals, and pollutants.

This session aims to advance understanding of these multifaceted processes by integrating perspectives at the terrestrial-aquatic-atmospheric interface. We welcome contributions that integrate hydrology, biogeochemistry, and ecology across different organizational and spatial scales, from organisms and communities to stream reaches, lakes, river networks, and catchments. Relevant topics include carbon and nutrient cycling and associated fluxes in soils and inland waters, ecohydrological dynamics, riverine metacommunities, food webs, greenhouse gas exchange, and ecosystem responses to anthropogenic and environmental pressures, including land-use and climate change.

We particularly encourage submissions that develop or combine innovative methods, including remote sensing, machine learning, mathematical modeling, and novel laboratory or field approaches, to address current spatial and temporal data limitations. We also welcome studies that apply concepts, tools, or methods from one discipline to generate new insights in another. By bringing together scientists from diverse backgrounds, this session seeks to foster interdisciplinary dialogue, promote methodological exchange, and stimulate new collaborations in hydrological, biogeochemical, and ecological research.