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Local and regional drivers of headwater streams metabolism: insights from the first AIL collaborative project
Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain.;Catalan Inst Water Res ICRA, Emili Grahit 101, Girona 17003, Spain..
Swedish Univ Agr Sci SLU, Dept Forest Ecol & Management, S-90183 Umea, Sweden..
Univ Barcelona, Fac Biol, Dept Biol Evolutiva Ecol & Ciencies Ambientals, Av Diagonal 643, E-08028 Barcelona, Spain..
Univ Cantabria Avda, Environm Hydraul Inst, Isabel Torres 15,Parque Cientif Tecnol Cantabria, Santander 39011, Spain..
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Number of Authors: 352017 (English)In: LIMNETICA, ISSN 0213-8409, Vol. 36, no 1, p. 67-85Article in journal (Refereed) Published
Abstract [en]

Streams play a key role in the global biogeochemical cycles, processing material from adjacent terrestrial systems and transporting it downstream. However, the drivers of stream metabolism, especially those acting at broad spatial scales, are still not well understood. Moreover, stream metabolism can be affected by hydrological changes associated with seasonality, and thus, assessing the temporality of metabolic rates is a key question to understand stream function. This study aims to analyse the geographical and temporal patterns in stream metabolism and to identify the main drivers regulating the whole ecosystem metabolic rates at local and regional scales. Using a coordinated distributed experiment, we studied ten headwaters streams located across five European ecoregions during summer and fall 2014. We characterized the magnitude and variability of gross primary production (GPP) and ecosystem respiration (ER) with the open-channel method. Moreover, we examined several climatic, geographical, hydrological, morphological, and physicochemical variables that can potentially control stream metabolic rates. Daily rates of stream metabolism varied considerately across streams, with GPP and ER ranging from 0.06 to 4.33 g O-2 m(-2) d(-1) and from 0.72 to 14.20 g O-2 m(-2) d(-1), respectively. All streams were highly heterotrophic (P/R < 1), except the southernmost one. We found that the drier climates tended to have the highest GPP, while humid regions presented the highest ER. Between the sampling periods no statistical differences were found. Partial-least squares models (PLS) explained similar to 80% of the variance in GPP and ER rates across headwater streams and included both local and regional variables. Rates of GPP varied primarily in response to the local variables, such as streambed substrate and stream water temperature. In contrast, regional variables, such as the mean annual temperature or the land use of the catchment, had more relevance to explain ER. Overall, our results highlight that stream metabolism depends on both local and regional drivers and show the positive experience of a young network of researchers to assess scientific challenges across large-scale geographic areas.

Place, publisher, year, edition, pages
2017. Vol. 36, no 1, p. 67-85
Keywords [en]
Gross primary production, ecosystem respiration, functioning, ecoregions, season, coordinated distributed experiment
National Category
Oceanography, Hydrology and Water Resources Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-329115DOI: 10.23818/limn.36.06ISI: 000404325000006OAI: oai:DiVA.org:uu-329115DiVA, id: diva2:1150452
Funder
Swedish Research Council, SMAREF 2014-2016Available from: 2017-10-19 Created: 2017-10-19 Last updated: 2018-01-13Bibliographically approved

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