Multiple stressors alter greenhouse gas concentrations in streams through local and distal processes
dc.contributor.author | Gutiérrez-Cánovas, Cayetano | |
dc.contributor.author | Schiller, Daniel von | |
dc.contributor.author | Pace, Giorgio | |
dc.contributor.author | Gómez-Gener, Lluís | |
dc.contributor.author | Pascoal, Cláudia | |
dc.date.accessioned | 2024-06-27T11:21:30Z | |
dc.date.available | 2024-06-27T11:21:30Z | |
dc.date.issued | 2024-04-30 | |
dc.description | The study was supported by the project STREAMECO: Biodiversity and ecosystem functioning under climate change: from the gene to the stream (PTDC/CTA-AMB/31245/2017), funded by the Portuguese Foundation for Science and Technology (FCT) and the European Regional Development Fund (ERDF) through the COMPETE2020—Programa Operacional Competitividade e Internacionalização (POCI). Also, this study had the support of FCT, I.P. by national funds through the strategic projects ‘Financiamento Programático’ UIDB/04050/2020 awarded to CBMA and LA/P/0069/2020 awarded to the Associate Laboratory ARNET. We are grateful to Anne Sophie Silva for her contribution to chlorophyll a determinations and to all the University of Minho's students who assisted in fieldwork. CGC was supported by a Junior Leader Fellowship contract (LCF/BQ/PR22/11920005) funded by ‘la Caixa’ Foundation (ID 100010434). DvS is a Serra Húnter Fellow. LGG was further supported by a fellowship from ‘la Caixa’ Foundation (ID 100010434) and from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska Curie grant agreement no. 847648 (fellowship: LCF/BQ/PI21/11830034) | es |
dc.description.abstract | Streams are significant contributors of greenhouse gases (GHG) to the atmosphere, and the increasing number of stressors degrading freshwaters may exacerbate this process, posing a threat to climatic stability. However, it is unclear whether the influence of multiple stressors on GHG concentrations in streams results from increases of in-situ metabolism (i.e., local processes) or from changes in upstream and terrestrial GHG production (i.e., distal processes). Here, we hypothesize that the mechanisms controlling multiple stressor effects vary between carbon dioxide (CO2) and methane (CH4), with the latter being more influenced by changes in local stream metabolism, and the former mainly responding to distal processes. To test this hypothesis, we measured stream metabolism and the concentrations of CO2 (pCO2) and CH4 (pCH4) in 50 stream sites that encompass gradients of nutrient enrichment, oxygen depletion, thermal stress, riparian degradation and discharge. Our results indicate that these stressors had additive effects on stream metabolism and GHG concentrations, with stressor interactions explaining limited variance. Nutrient enrichment was associated with higher stream heterotrophy and pCO2, whereas pCH4 increased with oxygen depletion and water temperature. Discharge was positively linked to primary production, respiration and heterotrophy but correlated negatively with pCO2. Our models indicate that CO2-equivalent concentrations can more than double in streams that experience high nutrient enrichment and oxygen depletion, compared to those with oligotrophic and oxic conditions. Structural equation models revealed that the effects of nutrient enrichment and discharge on pCO2 were related to distal processes rather than local metabolism. In contrast, pCH4 responses to nutrient enrichment, discharge and temperature were related to both local metabolism and distal processes. Collectively, our study illustrates potential climatic feedbacks resulting from freshwater degradation and provides insight into the processes mediating stressor impacts on the production of GHG in streams | es |
dc.identifier.citation | Gutiérrez-Cánovas, C., von Schiller, D., Pace, G., Gómez-Gener, L., & Pascoal, C. (2024). Multiple stressors alter greenhouse gas concentrations in streams through local and distal processes. Global Change Biology, 30, e17301. https://doi.org/10.1111/gcb.17301 | es |
dc.identifier.doi | 10.1111/gcb.17301 | es |
dc.identifier.issn | 1365-2486 (online) | |
dc.identifier.issn | 1354-1013 (print) | |
dc.identifier.uri | https://hdl.handle.net/10115/35424 | |
dc.language.iso | eng | es |
dc.publisher | Wiley | es |
dc.rights | Atribución-NoComercial 4.0 Internacional | * |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ | * |
dc.title | Multiple stressors alter greenhouse gas concentrations in streams through local and distal processes | es |
dc.type | info:eu-repo/semantics/article | es |
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