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Svensson, Fredrik
Publications (4 of 4) Show all publications
Broman, E., Li, L., Fridlund, J., Svensson, F., Legrand, C. & Dopson, M. (2019). Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure. Microbial Ecology (2), 288-303
Open this publication in new window or tab >>Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure
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2019 (English)In: Microbial Ecology, ISSN 0095-3628, E-ISSN 1432-184X, no 2, p. 288-303Article in journal (Refereed) Published
Abstract [en]

Two annual Baltic Sea phytoplankton blooms occur in spring and summer. The bloom intensity is determined by nutrient concentrations in the water, while the period depends on weather conditions. During the course of the bloom, dead cells sink to the sediment where their degradation consumes oxygen to create hypoxic zones (< 2 mg/L dissolved oxygen). These zones prevent the establishment of benthic communities and may result in fish mortality. The aim of the study was to determine how the spring and autumn sediment chemistry and microbial community composition changed due to degradation of diatom or cyanobacterial biomass, respectively. Results from incubation of sediment cores showed some typical anaerobic microbial processes after biomass addition such as a decrease in NO2 + NO3 in the sediment surface (0–1 cm) and iron in the underlying layer (1–2 cm). In addition, an increase in NO2 + NO3 was observed in the overlying benthic water in all amended and control incubations. The combination of NO2 + NO3 diffusion plus nitrification could not account for this increase. Based on 16S rRNA gene sequences, the addition of cyanobacterial biomass during autumn caused a large increase in ferrous iron-oxidizing archaea while diatom biomass amendment during spring caused minor changes in the microbial community. Considering that OTUs sharing lineages with acidophilic microorganisms had a high relative abundance during autumn, it was suggested that specific niches developed in sediment microenvironments. These findings highlight the importance of nitrogen cycling and early microbial community changes in the sediment due to sinking phytoplankton before potential hypoxia occurs.

Place, publisher, year, edition, pages
Springer, 2019
National Category
Ecology Microbiology
Research subject
Ecology, Microbiology
Identifiers
urn:nbn:se:lnu:diva-76944 (URN)10.1007/s00248-018-1229-6 (DOI)000460479100002 ()2-s2.0-85049948034 (Scopus ID)
Available from: 2018-07-18 Created: 2018-07-18 Last updated: 2019-08-29Bibliographically approved
Olofsson, M., Lindehoff, E., Frick, B., Svensson, F. & Legrand, C. (2015). Baltic Sea microalgae transform cement flue gas into valuable biomass. Algal Research, 11, 227-233
Open this publication in new window or tab >>Baltic Sea microalgae transform cement flue gas into valuable biomass
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2015 (English)In: Algal Research, ISSN 2211-9264, Vol. 11, p. 227-233Article in journal (Refereed) Published
Abstract [en]

We show high feasibility of using cement industrial flue gas as CO2 source for microalgal cultivation. The toxicity of cement flue gas (12-15% CO2) on algal biomass production and composition (lipids, proteins, carbohydrates) was tested using monocultures (Tetraselmis sp., green algae, Skeletonema marinoi, diatom) and natural brackish communities. The performance of a natural microalgal community dominated by spring diatoms was compared to a highly productive diatom monoculture S. marinoi fed with flue gas or air-CO2 mixture. Flue gas was not toxic to any of the microalgae tested. Instead we show high quality of microalgal biomass (lipids 20-30% DW, proteins 20-28% DW, carbohydrates 15-30% DW) and high production when cultivated with flue gas addition compared to CO2-air. Brackish Baltic Sea microalgal communities performed equally or better in terms of biomass quality and production than documented monocultures of diatom and green algae, often used in algal research and development. Hence, we conclude that microalgae should be included in biological solutions to transform waste into renewable resources in coastal waters. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
Microalgae, Baltic Sea, Flue gas, Biomass composition, Natural communities, Brackish
National Category
Microbiology Bioenergy Bioremediation
Research subject
Ecology, Aquatic Ecology
Identifiers
urn:nbn:se:lnu:diva-45559 (URN)10.1016/j.algal.2015.07.001 (DOI)000363046900029 ()2-s2.0-84943643090 (Scopus ID)
Projects
Algoland
Funder
Knowledge Foundation
Available from: 2015-07-25 Created: 2015-07-25 Last updated: 2018-02-26Bibliographically approved
Andersson, K. (2014). Forskningsprojekt: Alger ska rena utsläpp: "Algerna är en resurs som vi knappt använder". Baromtern (9 augusti)
Open this publication in new window or tab >>Forskningsprojekt: Alger ska rena utsläpp: "Algerna är en resurs som vi knappt använder"
2014 (Swedish)In: Baromtern, no 9 augustiArticle in journal, News item (Other (popular science, discussion, etc.)) Published
Keywords
algae, microalgae, climate change solutions, carbon dioxide emissions, industry, academia, collaboration, cement production, biology, alger, mikroalger, algoland, akvatisk ekologi, hållbarhet, koldioxid utsläpp, industri, samarbete
National Category
Ecology Environmental Sciences Natural Sciences
Research subject
Natural Science, Ecology; Ecology, Aquatic Ecology; Natural Science, Environmental Science
Identifiers
urn:nbn:se:lnu:diva-74359 (URN)
Projects
AlgolandEcoChange
Note

News article from Barometern OT, Kalmar, 9th August 2014 

Available from: 2018-05-15 Created: 2018-05-15 Last updated: 2018-11-20Bibliographically approved
Broman, E., Li, L., Fridlund, J., Svensson, F., Legrand, C. & Dopson, M.Eutrophication induced early stage hypoxic ‘dead zone’ sediment releases nitrate and stimulates growth of archaea.
Open this publication in new window or tab >>Eutrophication induced early stage hypoxic ‘dead zone’ sediment releases nitrate and stimulates growth of archaea
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

In the Baltic Sea, two annual algal blooms occur in spring and summer. The bloom intensity is determined by nutrient concentrations in the water column, while the period depends on weather conditions. During the course of the bloom, dead cells sink to the sediment where their degradation consumes oxygen to create hypoxic zones (< 2 mg/L dissolved oxygen, referred to as ‘dead zones’). These zones prevent the establishment of benthic communities and result in fish mortality. The aim of the study was to determine how the sediment chemistry and microbial community composition changed due to phytoplankton biomass degradation by adding cyanobacterial or diatom biomass to sediment cores from an all-year round oxic coastal Baltic Sea bay. After biomass addition, some typical anaerobic microbial processes were observed such as a decrease in NO2-+NO3- in the sediment surface (0-1 cm) and iron in the underlying layer (1-2 cm). In addition, an increase in NO2-+NO3- was observed in the water phase in all incubations (including controls without addition of phytoplankton biomass). The combination of NO2-+NO3- diffusion from the sediment plus nitrification of the available NH4+ could not account for this increase. Potential nitrogen sources that could at least partially explain this discrepancy included microbial nitrogen fixation and cycling of nitrogen compounds from deeper layers of the sediment. Based on 16S rRNA gene sequences, the addition of diatom biomass caused minor changes in the relative abundance of microbial community members while cyanobacterial biomass caused a large increase in ferrous iron-oxidizing archaea. Considering that OTUs sharing lineages with acidophilic microorganisms were present, it was suggested that specific niches developed in sediment microenvironments. These findings highlight the importance of nitrogen cycling in oxic sediments and early microbial community changes in the sediment surface due to sinking phytoplankton before major hypoxia events occur. The release of nitrate into the water could potentially enhance algal blooms and facilitate the development of ‘dead zones’.

National Category
Ecology
Research subject
Ecology, Microbiology
Identifiers
urn:nbn:se:lnu:diva-69708 (URN)
Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2018-02-26Bibliographically approved
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