Determining the biogeochemical transformations of organic matter composition in rivers using molecular signatures

• Autores: Buser Young, Jessica Z.; Garcia, Patricia Elizabeth; Schrenk, Matthew O.; Regier, Peter J.; Ward, Nicholas D.; Biçe, Kadir; Brooks, Scott C.; Freeman, Erika C.; Lønborg, Christian
• Año de publicación: 2023
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: organic matter,; crowdsourced science; FT-ICR-MS; biogeochemical transformations
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Inland waters are hotspots for biogeochemical activity, but the environmental and biological factors that govern the transformation of organic matter (OM) flowing through them are still poorly constrained. Here we evaluate data from a crowdsourced sampling campaign led by the Worldwide Hydrobiogeochemistry Observation Network for Dynamic River Systems (WHONDRS) consortium to investigate broad continental-scale trends in OM composition compared to localized events that influence biogeochemical transformations. Samples from two dierent OM compartments, sediments and surface water, were collected from 97 streams throughout the Northern Hemisphere and analyzed to identify dierences in biogeochemical processes involved in OM transformations. By using dimensional reduction techniques, we identified that putative biogeochemical transformations and microbial respiration rates vary across sediment and surface water along river continua independent of latitude (18◦N−68◦N). In contrast, we reveal small- and large-scale patterns in OM composition related to local (sediment vs. water column) and reach (stream order, latitude) characteristics. These patterns lay the foundation to modeling the linkage between ecological processes and biogeochemical signals. We further showed how spatial, physical, and biogeochemical factors influence the reactivity of the two OM pools in local reaches yet find emergent broad-scale patterns between OM concentrations and stream order. OM processing will likely change as hydrologic flow regimes shift and vertical mixing occurs on dierent spatial and temporal scales. As our planet continues to warm and the timing and magnitude of surface and subsurface flows shift, understanding changes in OM cycling across hydrologic systems is critical, given the unknown broad-scale responses and consequences for riverine OM.
Fil: Buser Young, Jessica Z.. State University of Oregon; Estados Unidos
Fil: Garcia, Patricia Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte. Instituto de Investigaciones en Biodiversidad y Medioambiente. Universidad Nacional del Comahue. Centro Regional Universidad Bariloche. Instituto de Investigaciones en Biodiversidad y Medioambiente; Argentina
Fil: Schrenk, Matthew O.. Michigan State University; Estados Unidos
Fil: Regier, Peter J.. Department Civil And Environmental Engineering ; College Of Engineering ; University Of Washington;
Fil: Ward, Nicholas D.. Department Civil And Environmental Engineering ; College Of Engineering ; University Of Washington;
Fil: Biçe, Kadir. University of Georgia; Estados Unidos
Fil: Brooks, Scott C.. United States Department of Energy; Estados Unidos
Fil: Freeman, Erika C.. University of Cambridge; Estados Unidos
Fil: Lønborg, Christian. University Aarhus; Dinamarca