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Seawater browning alters community composition and reduces nutritional quality of plankton in a subarctic marine ecosystem
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Department of Animal Science, Faculty of Animal Science and Export Agriculture, Uva Wellassa University, Passara Road, 90000 Badulla, Sri Lanka. (EcoChange; UMFpub)ORCID iD: 0000-0002-7211-6374
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; UMFpub)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; UMFpub)ORCID iD: 0000-0001-7819-9038
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, 75007 Uppsala, Sweden.ORCID iD: 0000-0002-3246-7508
2022 (English)In: Canadian Journal of Fisheries and Aquatic Sciences, ISSN 0706-652X, E-ISSN 1205-7533, Vol. 79, no 8, p. 1291-1301Article in journal (Refereed) Published
Abstract [en]

Inflows of coloured terrestrial organic matter cause seawater browning and reduced phytoplankton production in subarctic coastal ecosystems, potentially deteriorating the nutritional quality of marine food webs. We analyzed the fatty-acid (FA) compositions of seston and the zooplankton taxa Eurytemora affinis and cladocerans at three locations of the northern Baltic Sea. At the coastal and northerly locations, salinity and phosphorus concentrations were low, while concentrations of humic substances (i.e., terrestrial organic matter) were high. The southerly location showed the opposite trend. The ratio between alga-specific ?3 polyunsaturated FA and terrigenous monounsaturated FA (MUFA) in Eurytemora decreased from south to north, as did the ratio between the alga-specific docosahexaenoic acid (DHA) and terrigenous MUFA in cladocerans. With increasing humic substances, the biomass of DHA-rich phytoplankton decreased and the zooplankton MUFA content increased. Our results indicate that coloured terrestrial organic matter alters the phytoplankton composition, consequently affecting the zooplankton nutritional quality.

Abstract [fr]

Les influx de matière organique terrestre causent le brunissement de l’eau de mer et réduisent la production duphytoplancton dans les écosystèmes côtiers subarctiques, ce qui peut se traduire par une détérioration de la qualité nutri-tionnelle des réseaux trophiques marins. Nous avons analysé la composition d’acides gras du seston, du taxon de zooplanctonEurytemora affinis et de cladocères dans trois sites de la mer Baltique septentrionale. Dans les sites côtier et nordique, la salinité etles concentrations de phosphore étaient faibles, alors que les concentrations de substances humiques (c.-à-d. matière organiqueterrestre) étaient élevées. Le site plus au sud présentait des tendances inverses. Le rapport des acides gras polyinsaturés x3 spécifiquesaux algues et des acides gras monoinsaturés (AGMI) terrigènes chez Eurytemora diminuait du sud au nord, tout comme le rapport del’acide docosahexanoïque (ADH) spécifique aux algues et des AGMI chez les cladocères. Plus l’abondance de substances humiques étaitélevée, plus la biomasse de phytoplancton riche en ADH était faible et plus le contenu en AGMI du zooplancton était important. Nosrésultats indiquent que de la matière organique terrestre colorée modifie la composition du phytoplancton et a par conséquent uneincidence sur la qualité nutritionnelle du zooplancton. [Traduit par la Rédaction]

Place, publisher, year, edition, pages
Canadian Science Publishing , 2022. Vol. 79, no 8, p. 1291-1301
National Category
Ecology
Identifiers
URN: urn:nbn:se:umu:diva-196956DOI: 10.1139/cjfas-2021-0118ISI: 000795593000001Scopus ID: 2-s2.0-85129566536OAI: oai:DiVA.org:umu-196956DiVA, id: diva2:1673475
Funder
Swedish Research Council Formas, FR-2019/0007Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGEAvailable from: 2022-06-21 Created: 2022-06-21 Last updated: 2023-04-24Bibliographically approved

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