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High abundances of the nuisance raphidophyte Gonyostomum semen in brown water lakes are associated with high concentrations of iron
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science. Uppsala University. (Ctr Ecol & Evolut Microbial Model Syst EEMiS)ORCID iD: 0000-0002-3853-1662
Swedish University of Agricultural Sciences.
Uppsala University.
Swedish University of Agricultural Sciences.
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 13463Article in journal (Refereed) Published
Abstract [en]

Algal blooms occur frequently in lakes and oceans and the causes and consequences of those are often studied. In this study, we focus on a less well known type of algal bloom by the freshwater raphidophyte Gonyostomum semen. This species' abundance and occurrence is increasing, especially in brown water lakes, the most abundant lake type in the boreal zone. The aim of the study was to investigate which environmental factors are associated with G. semen by statistical evaluation of field data of 95 Swedish lakes over five years. Although we found G. semen to be associated with dark waters it was, contrary to our expectations, mainly high concentrations of iron, and only to a lesser extent high TOC (total organic carbon) concentrations, that were associated with blooms of G. semen. In addition, high phosphorus concentrations and low pH also appear to facilitate G. semen blooms. We suggest that browning of lakes caused by increased iron concentrations may decrease net heterotrophy by fostering heavy algal blooms, i.e. the opposite to commonly assumed effects of increased DOM (dissolved organic matter).

Place, publisher, year, edition, pages
Nature Publishing Group, 2018. Vol. 8, article id 13463
National Category
Ecology
Research subject
Ecology, Aquatic Ecology
Identifiers
URN: urn:nbn:se:lnu:diva-78098DOI: 10.1038/s41598-018-31892-7ISI: 000444022800067PubMedID: 30194445Scopus ID: 2-s2.0-85052985359OAI: oai:DiVA.org:lnu-78098DiVA, id: diva2:1252424
Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2019-08-29Bibliographically approved

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Lebret, Karen

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