Temperature enhances the functional diversity of dissolved organic matter utilization by coastal marine bacteria

Autor: Tamara Megan Huete-Stauffer, Xosé Anxelu G. Morán, Laura Alonso-Sáez, Nestor Arandia-Gorostidi
Přispěvatelé: European Commission, Ministerio de Economía y Competitividad (España), Ministerio de Educación (España), Eusko Jaurlaritza, Agencia Estatal de Investigación (España)
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: e-IEO. Repositorio Institucional Digital de Acceso Abierto del Instituto Español de Oceanografía
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ISSN: 1758-2229
Popis: 7 pages, 3 figures, 1 table, supporting information https://doi.org/10.1111/1758-2229.13123.-- Data Availability Statement: Data are available upon request.
Although bulk bacterial metabolism in response to temperature has been determined for different oceanic regions, the impact of temperature on the functional diversity of dissolved organic matter (DOM) utilization has been largely unexplored. Here, we hypothesized that besides modifying the rates of carbon utilization, temperature can also alter the diversity of substrates utilized. The patterns of utilization of 31 model DOM compounds (as represented in Biolog EcoPlate™) by bacterioplankton were assessed using inocula from surface waters of the southern Bay of Biscay continental shelf over 1 year. Bacteria utilized more polymers and carbohydrates in late spring and summer than in winter, likely reflecting changes in substrate availability linked to the release and accumulation of DOM in phytoplankton post-bloom conditions. Seawater temperature correlated positively with the number of substrates utilized (i.e. functional richness) and this relationship was maintained in monthly experimental incubations spanning 3°C below and above in situ values. The enhancement of functional richness with experimental warming displayed a unimodal response to ambient temperature, peaking at 16°C. This temperature acted as a threshold separating nutrient-sufficient from nutrient-deficient conditions at the study site, suggesting that trophic conditions will be critical in the response of microbial DOM utilization to future warming
This work was supported by the Marie Curie European Reintegration Grant ‘FUNDIVERSITY’ (FP7, Grant Agreement 268331), the time-series program RADIALES from the Spanish Institute of Oceanography (IEO, CSIC), and the research grant Coastal Ocean MIcrobial communities and TEmperature (COMITE, CTM2010-15840). Laura Alonso-Sáez was supported by the research contracts ‘Juan de la Cierva’ and ‘Ramon y Cajal’ from the Spanish Ministries of Science and Education and Economy and Competitiveness (MINECO), respectively. Nestor Arandia-Gorostidi and Tamara Megan Huete-Stauffer were recipient of PhD fellowships from the Basque Government and MINECO, respectively
With the institutional support of the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000928-S)
Databáze: OpenAIRE
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