Effects of Salinity and Inundation on Microbial Community Structure and Function in a Mangrove Peat Soil

Shifts in microbial community function and structure can be indicators of environmental stress and ecosystem change in wetland soils. This study evaluated the effects of increased salinity, increased inundation, and their combination, on soil microbial function (enzyme activity) and structure (phosp...

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Veröffentlicht in:Wetlands (Wilmington, N.C.) N.C.), 2016-04, Vol.36 (2), p.361-371
Hauptverfasser: Chambers, Lisa G., Guevara, Rafael, Boyer, Joseph N., Troxler, Tiffany G., Davis, Stephen E.
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container_end_page 371
container_issue 2
container_start_page 361
container_title Wetlands (Wilmington, N.C.)
container_volume 36
creator Chambers, Lisa G.
Guevara, Rafael
Boyer, Joseph N.
Troxler, Tiffany G.
Davis, Stephen E.
description Shifts in microbial community function and structure can be indicators of environmental stress and ecosystem change in wetland soils. This study evaluated the effects of increased salinity, increased inundation, and their combination, on soil microbial function (enzyme activity) and structure (phospholipid fatty acid (PLFA) signatures and terminal restriction fragment length polymorphisms (T-RFLP) profiles) in a brackish mangrove peat soil using tidal mesocosms (Everglades, Florida, USA). Increased tidal inundation resulted in reduced soil enzyme activity, especially alkaline phosphatase, an increase in the abundance and diversity of prokaryotes, and a decline in number of eukaryotes. The community composition of less abundant bacteria (T-RFLPs comprising 0.3–1 % of total fluorescence) also shifted as a result of increased inundation under ambient salinity. Several key biogeochemical indicators (oxidation-reduction potential, CO 2 flux, porewater NH 4 + , and dissolved organic carbon) correlated with measured microbial parameters and differed with inundation level. This study indicates microbial function and composition in brackish soil is more strongly impacted by increased inundation than increased salinity. The observed divergence of microbial indicators within a short time span (10-weeks) demonstrates their usefulness as an early warning signal for shifts in coastal wetland ecosystems due to sea level rise stressors.
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This study indicates microbial function and composition in brackish soil is more strongly impacted by increased inundation than increased salinity. 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This study indicates microbial function and composition in brackish soil is more strongly impacted by increased inundation than increased salinity. 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This study indicates microbial function and composition in brackish soil is more strongly impacted by increased inundation than increased salinity. The observed divergence of microbial indicators within a short time span (10-weeks) demonstrates their usefulness as an early warning signal for shifts in coastal wetland ecosystems due to sea level rise stressors.</abstract><cop>Dordrecht</cop><pub>Springer Netherlands</pub><doi>10.1007/s13157-016-0745-8</doi><tpages>11</tpages></addata></record>
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subjects Alkaline phosphatase
Alkaline soils
Aquatic ecosystems
Bacteria
Biogeochemistry
Biomedical and Life Sciences
Carbon dioxide
Coastal ecosystems
Coastal Sciences
Community composition
Community structure
Composition
Dissolved organic carbon
Ecology
Environmental changes
Environmental indicators
Environmental Management
Environmental stress
Enzymatic activity
Enzyme activity
Enzymes
Eukaryotes
Fatty acids
Freshwater & Marine Ecology
Hydrogeology
Indicators
Landscape Ecology
Life Sciences
Metabolism
Microbiomes
Microorganisms
Original Research
Oxidation
Oxidation-reduction potential
Peat
Peat soils
Phospholipids
Pore water
Prokaryotes
Redox potential
Salinity
Salinity effects
Sea level
Sea level rise
Soils
Structure-function relationships
Tidal flooding
Wetlands
title Effects of Salinity and Inundation on Microbial Community Structure and Function in a Mangrove Peat Soil
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