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Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure

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...

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Autores principales: Broman, Elias, Li, Lingni, Fridlund, Jimmy, Svensson, Fredrik, Legrand, Catherine, Dopson, Mark
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer US 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6394492/
https://www.ncbi.nlm.nih.gov/pubmed/30019110
http://dx.doi.org/10.1007/s00248-018-1229-6
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author Broman, Elias
Li, Lingni
Fridlund, Jimmy
Svensson, Fredrik
Legrand, Catherine
Dopson, Mark
author_facet Broman, Elias
Li, Lingni
Fridlund, Jimmy
Svensson, Fredrik
Legrand, Catherine
Dopson, Mark
author_sort Broman, Elias
collection PubMed
description 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 NO(2)(−) + NO(3)(−) in the sediment surface (0–1 cm) and iron in the underlying layer (1–2 cm). In addition, an increase in NO(2)(−) + NO(3)(−) was observed in the overlying benthic water in all amended and control incubations. The combination of NO(2)(−) + NO(3)(−) 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. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s00248-018-1229-6) contains supplementary material, which is available to authorized users.
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spelling pubmed-63944922019-03-15 Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure Broman, Elias Li, Lingni Fridlund, Jimmy Svensson, Fredrik Legrand, Catherine Dopson, Mark Microb Ecol Microbiology of Aquatic Systems 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 NO(2)(−) + NO(3)(−) in the sediment surface (0–1 cm) and iron in the underlying layer (1–2 cm). In addition, an increase in NO(2)(−) + NO(3)(−) was observed in the overlying benthic water in all amended and control incubations. The combination of NO(2)(−) + NO(3)(−) 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. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s00248-018-1229-6) contains supplementary material, which is available to authorized users. Springer US 2018-07-17 2019 /pmc/articles/PMC6394492/ /pubmed/30019110 http://dx.doi.org/10.1007/s00248-018-1229-6 Text en © The Author(s) 2018 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Microbiology of Aquatic Systems
Broman, Elias
Li, Lingni
Fridlund, Jimmy
Svensson, Fredrik
Legrand, Catherine
Dopson, Mark
Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure
title Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure
title_full Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure
title_fullStr Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure
title_full_unstemmed Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure
title_short Spring and Late Summer Phytoplankton Biomass Impact on the Coastal Sediment Microbial Community Structure
title_sort spring and late summer phytoplankton biomass impact on the coastal sediment microbial community structure
topic Microbiology of Aquatic Systems
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6394492/
https://www.ncbi.nlm.nih.gov/pubmed/30019110
http://dx.doi.org/10.1007/s00248-018-1229-6
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