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The thiamine content of phytoplankton cells is affected by abiotic stress and growth rate
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
2013 (English)In: Microbial Ecology, ISSN 0095-3628, E-ISSN 1432-184X, Vol. 65, no 3, 566-77 p.Article in journal (Refereed) Published
Abstract [en]

Thiamine (vitamin B1) is produced by many plants, algae and bacteria, but by higher trophic levels, it must be acquired through the diet. We experimentally investigated how the thiamine content of six phytoplankton species belonging to five different phyla is affected by abiotic stress caused by changes in temperature, salinity and photon flux density. Correlations between growth rate and thiamine content per cell were negative for the five eukaryotic species, but not for the cyanobacterium Nodularia spumigena. We demonstrate a high variability in thiamine content among phytoplankton species, with the highest content in N. spumigena. Salinity was the factor with the strongest effect, followed by temperature and photon flux density, although the responses varied between the investigated phytoplankton species. Our results suggest that regime shifts in phytoplankton community composition through large-scale environmental changes has the potential to alter the thiamine availability for higher trophic levels. A decreased access to this essential vitamin may have serious consequences for aquatic food webs.

Place, publisher, year, edition, pages
2013. Vol. 65, no 3, 566-77 p.
National Category
Other Biological Topics Ecology Microbiology
Research subject
Marine Ecology
Identifiers
URN: urn:nbn:se:su:diva-89149DOI: 10.1007/s00248-012-0156-1ISI: 000317421000005PubMedID: 23263236OAI: oai:DiVA.org:su-89149DiVA: diva2:616040
Funder
Formas, 21.9/2003-1033Formas, 21.0/2004-0313EU, European Research Council, FiV Dnr 231-0692-04
Available from: 2013-04-15 Created: 2013-04-15 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Thiamine dynamics in the pelagic food web of the Baltic Sea
Open this publication in new window or tab >>Thiamine dynamics in the pelagic food web of the Baltic Sea
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Thiamine (vitamin B1) is involved in several basal metabolic processes. It is an essential compound for many organisms and in aquatic systems it is mainly produced by phytoplankton and prokaryotes and transferred to higher trophic levels through grazing and predation. The occurrence of thiamine deficiency in top predators has been reported from several aquatic systems. In the Baltic populations of the Atlantic salmon (Salmo salar) this has been observed since 1974 and recently thiamine deficiency has also been reported for Baltic sea birds.

This thesis aims at investigating what processes that governs the flow of thiamine from the primary producers to top predators via zooplankton grazers and planktivoric fish. Paper I showed that abiotic stress factors such as salinity, temperature and light conditions can alter the thiamine content of phytoplankton. Paper II showed that abiotic factors indirectly can affect the stress resistance of zooplankton grazers by changing the nutritional quality of their food. In Paper III we found that the in situ thiamine content of zooplankton grazers was directly affected by that of the phytoplankton diet. In Paper IV we found a similar connection between the thiamine contents of Baltic salmon and herring, one of the major salmon prey species. In Paper V we looked at the thiamine content of the pelagic food web of the Baltic Sea as a whole and found a pattern of trophic dilution; the higher the trophic level of an organism (i.e. the further away from the source of thiamine in the food web), the lower was its thiamine content.

In all, the results of this thesis suggests a bottom up effect on the thiamine status of the higher trophic levels of  the Baltic Sea and that external factors, both natural and man-made, have the capability to affect the thiamine status of the plankton communities and thereby the whole Baltic ecosystem. Thiamine and other micronutrients are not something generally considered in the environmental management of aquatic systems but the results of this thesis suggest that ecological disturbances indirectly can have negative effects on top predators via a disrupted supply of essential substances.

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2013. 35 p.
Keyword
Thiamine, Vitamin B1, Baltic Sea, M74
National Category
Ecology
Research subject
Marine Ecology
Identifiers
urn:nbn:se:su:diva-89192 (URN)978-91-7447-707-8 (ISBN)
Public defence
2013-05-31, De Geersalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 14:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council Formas, 21.9/2003-1033Swedish Research Council Formas, 21.0/2004-0313EU, FP7, Seventh Framework Programme, FiV Dnr 231-0692-04
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Manuscript. Paper 3: Manuscript. Paper 4: Manuscript. Paper 5: Manuscript.

Available from: 2013-05-07 Created: 2013-04-16 Last updated: 2017-09-12Bibliographically approved

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