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  • Catalán, Núria,1985-Uppsala universitet,Limnologi,Catalan Inst Water Res ICRA, Girona, Spain (author)

Behind the Scenes : mechanisms Regulating Climatic Patterns of Dissolved Organic Carbon Uptake in Headwater Streams

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • American Geophysical Union (AGU),2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:umu-154978
  • https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-154978URI
  • https://doi.org/10.1029/2018GB005919DOI
  • https://res.slu.se/id/publ/97216URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-371059URI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Large variability in dissolved organic carbon (DOC) uptake rates has been reported for headwater streams, but the causes of this variability are still not well understood. Here we assessed acetate uptake rates across 11 European streams comprising different ecoregions by using whole-reach pulse acetate additions. We evaluated the main climatic and biogeochemical drivers of acetate uptake during two seasonal periods. Our results show a minor influence of sampling periods but a strong effect of climate and dissolved organic matter (DOM) composition on acetate uptake. In particular, mean annual precipitation explained half of the variability of the acetate uptake velocities (Vf(Acetate)) across streams. Temperate streams presented the lowest Vf(Acetate), together with humic-like DOM and the highest stream respiration rates. In contrast, higher Vf(Acetate) were found in semiarid streams, with protein-like DOM, indicating a dominance of reactive, labile compounds. This, together with lower stream respiration rates and molar ratios of DOC to nitrate, suggests a strong C limitation in semiarid streams, likely due to reduced inputs from the catchment. Overall, this study highlights the interplay of climate and DOM composition and its relevance to understand the biogeochemical mechanisms controlling DOC uptake in streams. Plain Language Summary Headwater streams receive and degrade organic carbon and nutrients from the surrounding catchments. That degradation can be assessed by measuring the uptake of simple compounds of carbon or nitrogen such as acetate or nitrate. Here we determine the variability in acetate and nitrate uptake rates across headwater streams and elucidate the mechanisms behind that variability. The balance between nutrients, the composition of the organic materials present in the streams, and the climatic background is at interplay.

Subject headings and genre

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  • Casas-Ruiz, J. P.Univ Quebec Montreal, Dept Biol Sci, Grp Rech Interuniv Limnol, Montreal, PQ, Canada (author)
  • Arce, M. I.Ctr Edafol & Apply Biol Segura CEBAS CSIC, Murcia, Spain,Univ Basque Country UPV EHU, Dept Plant Biol & Ecol, Lab Stream Ecol, Bilbao, Spain (author)
  • Abril, M.Univ Vic Cent Univ Catalonia, Aquat Ecol Grp, BETA Technol Ctr, Barcelona, Spain,Univ Cantabria, Environm Hydraul Inst, Santander, Spain (author)
  • Bravo, A. G.CSIC, Inst Environm Assessment & Water Res IDAEA, Dept Environm Chem, Barcelona, Spain (author)
  • del Campo, R.Univ Murcia, Fac Biol, Dept Ecol & Hydrol, Reg Campus Int Excellence Campus Mare Nostrum, Murcia, Spain (author)
  • Estévez, E.Univ Cantabria, Environm Hydraul Inst, Santander, Spain (author)
  • Freixa, A. (author)
  • Giménez-Grau, P.CREAF CSIC, Cerdanyola Del Valles, Spain (author)
  • González-Ferreras, A. M. (author)
  • Gómez-Gener, LuísUmeå universitet,Institutionen för ekologi, miljö och geovetenskap(Swepub:umu)llgm0001 (author)
  • Lupon, A.Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,Swedish Univ Agr Sci, Dept Forest Ecol & Management, Umea, Sweden (author)
  • Martinez, A. (author)
  • Palacin-Lizarbe, C.CREAF CSIC, Cerdanyola Del Valles, Spain (author)
  • Poblador, S.Univ Barcelona, Fac Biol, Dept Biol Evolut Ecol & Ciencies Ambientals, Barcelona, Spain (author)
  • Rasines-Ladero, R.Univ Alcala De Henares, Parque Cient Tecnol, iMdea Water Inst, De Henares, Spain (author)
  • Reyes, M.Eawag, Swiss Fed Inst Aquat Sci & Technol, Dept Aquat Ecol, Dubendorf, Switzerland (author)
  • Rodriguez-Castillo, T.Univ Cantabria, Environm Hydraul Inst, Santander, Spain (author)
  • Rodriguez-Lozano, P.Univ Calif Berkeley, Dept Environm Sci Policy & Management, Berkeley, CA 94720 USA (author)
  • Sanpera-Calbet, I.Univ Barcelona, Fac Biol, Dept Biol Evolut Ecol & Ciencies Ambientals, Barcelona, Spain (author)
  • Tornero, I.Univ Girona, Inst Aquat Ecol, GRECO, Girona, Spain (author)
  • Pastor, A.Aarhus Univ, Dept Biosci, Aarhus, Denmark (author)
  • Gomez-Gener, Ll.Umea Univ, Dept Ecol & Environm Sci, Umea, Sweden (author)
  • Uppsala universitetLimnologi (creator_code:org_t)
  • Sveriges lantbruksuniversitet

Related titles

  • In:Global Biogeochemical Cycles: American Geophysical Union (AGU)32:10, s. 1528-15410886-62361944-9224

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