dc.date.accessioned | 2021-03-26T19:22:23Z | |
dc.date.available | 2021-03-26T19:22:23Z | |
dc.date.created | 2020-10-23T14:06:40Z | |
dc.date.issued | 2020 | |
dc.identifier.citation | Allesson, Lina Andersen, Tom Dörsch, Peter Eiler, Alexander Wei, Jing Hessen, Dag Olav . Phosphorus availability promotes bacterial DOC-mineralization, but not cumulative CO2-production. Frontiers in Microbiology. 2020, 11 | |
dc.identifier.uri | http://hdl.handle.net/10852/84944 | |
dc.description.abstract | The current trend of increasing input of terrestrially derived dissolved organic carbon (DOC) to boreal freshwater systems is causing increased levels of carbon dioxide (CO 2 ) supersaturation and degassing. Phosphorus (P) is often the most limiting nutrient for bacterial growth and would thus be expected to increase overall mineralization rates and CO 2 production. However, high carbon (C) to P ratios of terrestrially derived DOC could also cause elevated cell-specific respiration of the excess C in heterotrophic bacteria. Using data from a survey of 75 Scandinavian lakes along an ecosystem gradient of DOC, we estimated in situ CO 2 production rates. These rates showed a unimodal response with DOC-specific CO 2 production negatively related to DOC:total phosphorus (TP) ratio, and a turning point at 5 mg C L −1 , indicating higher DOC turnover rates in productive than in unproductive lakes. To further assess the dependency of bacterial respiration (BR) on DOC and P, we monitored CO 2 production in incubations of water with a gradient of DOC crossed with two levels of inorganic P. Finally, we crossed DOC and P with a temperature gradient to test the temperature dependency of respiration rates [as oxygen (O 2 ) consumption]. While total CO 2 production seemed to be unaffected by P additions, respiration rates, and growth yields, as estimated by ribosomal gene copy numbers, suggest increased bacterial growth and decreased cell-specific respiration under non-limited P conditions. Respiration rates showed a sigmoid response to increasing DOC availability reaching a plateau at about 20 mg C L −1 of initial DOC concentrations. In addition to these P and DOC level effects, respiration rates responded in a non-monotonic fashion to temperature with an increase in respiration rates by a factor of 2.6 (±0.2) from 15 to 25°C and a decrease above 30°C. The combined results from the survey and experiments highlight DOC as the major determinant of CO 2 production in boreal lakes, with P and temperature as significant modulators of respiration kinetics. | |
dc.language | EN | |
dc.rights | Attribution 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.title | Phosphorus availability promotes bacterial DOC-mineralization, but not cumulative CO2-production | |
dc.title.alternative | AKAkanAkanPhosphorus availability promotes bacterial DOC-mineralization, but not cumulative CO<sub>2</sub>-production | |
dc.type | Journal article | |
dc.creator.author | Allesson, Lina | |
dc.creator.author | Andersen, Tom | |
dc.creator.author | Dörsch, Peter | |
dc.creator.author | Eiler, Alexander | |
dc.creator.author | Wei, Jing | |
dc.creator.author | Hessen, Dag Olav | |
cristin.unitcode | 185,15,29,70 | |
cristin.unitname | Seksjon for akvatisk biologi og toksikologi | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |
dc.identifier.cristin | 1841825 | |
dc.identifier.bibliographiccitation | info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Frontiers in Microbiology&rft.volume=11&rft.spage=&rft.date=2020 | |
dc.identifier.jtitle | Frontiers in Microbiology | |
dc.identifier.volume | 11 | |
dc.identifier.pagecount | 12 | |
dc.identifier.doi | https://doi.org/10.3389/fmicb.2020.569879 | |
dc.identifier.urn | URN:NBN:no-87637 | |
dc.type.document | Tidsskriftartikkel | |
dc.type.peerreviewed | Peer reviewed | |
dc.source.issn | 1664-302X | |
dc.identifier.fulltext | Fulltext https://www.duo.uio.no/bitstream/handle/10852/84944/1/Phosphorus%2BAvailability-fmicb-11-569879.pdf | |
dc.type.version | PublishedVersion | |
cristin.articleid | 569879 | |
dc.relation.project | NFR/196336 | |