caa a22 4500 60551657X CHVBK 20210128100714.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10533-015-0103-6 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0103-6 Longitudinal shifts in dissolved organic matter chemogeography and chemodiversity within headwater streams: a river continuum reprise [Elektronische Daten] [Jennifer Mosher, Louis Kaplan, David Podgorski, Amy McKenna, Alan Marshall] We tested a long-standing hypothesis within river ecology, predicted by the River Continuum Concept, that dissolved organic matter (DOM) diversity decreases with stream order. We measured DOM molecular composition across three stream orders in the headwaters of well characterized forested catchments with ultrahigh-resolution mass spectrometry to assess DOM chemogeography and chemodiversity over the spatial scales of climatic regions and fluvial networks. Stream waters with similar dissolved organic carbon (DOC) concentrations in different climatic regions had distinctive DOM compositions, but shared 69.5% of the 3286 individual chemical formulae detected. DOM compositions common to all watersheds were characterized by abundant lignin-like and tannin-like molecules as well as carboxyl-rich alicyclic-like molecules (CRAM); 50% of all formulae were found in all streams. Of the roughly 700 unique chemical formulae within a given fluvial network, most were outside the CRAM region within a van Krevelen diagram and 78 to 95% were restricted to 1st-order streams where diffuse ground water sources surface, coalesce into a channel, and flow downstream. The 1st-order streams within a fluvial network also exhibited the highest formula diversity as well as the greatest numbers of formulae across a broad range of compound classes. Springer International Publishing Switzerland, 2015 DOM nationallicence FT ICR-MS nationallicence Headwater streams nationallicence Carbon cycling nationallicence Mosher Jennifer Stroud Water Research Center, 970 Spencer Rd., 19311, Avondale, PA, USA aut Kaplan Louis Stroud Water Research Center, 970 Spencer Rd., 19311, Avondale, PA, USA aut Podgorski David Future Fuels Institute, Florida State University, 32310, Tallahassee, FL, USA aut McKenna Amy National High Magnetic Field Laboratory, Florida State University, 32310, Tallahassee, FL, USA aut Marshall Alan National High Magnetic Field Laboratory, Florida State University, 32310, Tallahassee, FL, USA aut Biogeochemistry Springer International Publishing 124/1-3(2015-05-01), 371-385 0168-2563 124:1-3<371 2015 124 10533 https://doi.org/10.1007/s10533-015-0103-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0103-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mosher Jennifer Stroud Water Research Center, 970 Spencer Rd., 19311, Avondale, PA, USA aut NATIONALLICENCE 700 1- Kaplan Louis Stroud Water Research Center, 970 Spencer Rd., 19311, Avondale, PA, USA aut NATIONALLICENCE 700 1- Podgorski David Future Fuels Institute, Florida State University, 32310, Tallahassee, FL, USA aut NATIONALLICENCE 700 1- McKenna Amy National High Magnetic Field Laboratory, Florida State University, 32310, Tallahassee, FL, USA aut NATIONALLICENCE 700 1- Marshall Alan National High Magnetic Field Laboratory, Florida State University, 32310, Tallahassee, FL, USA aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 124/1-3(2015-05-01), 371-385 0168-2563 124:1-3<371 2015 124 10533