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Carbon-nitrogen association influences response of the microplankton food web to enrichment
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (EcoChange)
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). (EcoChange)ORCID iD: 0000-0002-1298-3839
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (EcoChange)ORCID iD: 0000-0001-7819-9038
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0003-0107-9374
2022 (English)In: Aquatic Microbial Ecology, ISSN 0948-3055, E-ISSN 1616-1564, Vol. 88, p. 187-199Article in journal (Refereed) Published
Abstract [en]

In aquatic ecosystems, there are 2 major forms of N available at the base of the planktonic food web: dissolved organic N (DON) and dissolved inorganic N (DIN). In DON, N is associated with organic C, which may promote both heterotrophs and autotrophs. In environments where DIN nitrate is the prevailing N form and dissociated dissolved organic C (DOC) is available, heterotrophs may also be promoted, but they may compete with the autotrophs for DIN. The influence of associated or dissociated CN nutrient sources on the interaction between organisms and the food web function is poorly known and has not been studied before. To approach this question, we performed a microcosm experiment with a coastal microbial food web, where N and C nutrient sources were provided either associated in 1 molecular compound (DON), or dissociated in 2 separate molecular compounds (DIN and DOC). The results showed that association or dissociation of C and N input had marked effects on all trophic levels, most probably through its effect on bacteria-phytoplankton interaction, which switched between increased coupling and increased competition. The biomass of all components of the food web benefitted from the association of C and N in a single DON molecule. Our study indicated that the degree of association between C and N is an important factor affecting the productivity and efficiency of the microbial food web. Therefore, the C and N association should be considered when studying aquatic systems.

Place, publisher, year, edition, pages
2022. Vol. 88, p. 187-199
Keywords [en]
Organic nitrogen, Inorganic nitrogen, Organic carbon, Microbial food web, Ecological stoichiometry, Bacteria−phytoplankton interaction
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-201812DOI: 10.3354/ame01993ISI: 000915765700001OAI: oai:DiVA.org:umu-201812DiVA, id: diva2:1720765
Funder
Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGESwedish Research Council FormasKnut and Alice Wallenberg FoundationAvailable from: 2022-12-20 Created: 2022-12-20 Last updated: 2023-09-05Bibliographically approved

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Guo, JunwenBrugel, SoniaAndersson, AgnetaCherif, Mehdi

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