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Sediment anoxia limits microbial-driven seagrass carbon remineralization under warming conditions

Trevathan-Tackett, Stacey M., Seymour, Justin R., Nielsen, Daniel A., Macreadie, Peter I., Jeffries, Thomas C., Sanderman, Jonathan, Baldock, Jeff, Howes, Johanna M., Steven, Andrew D.L. and Ralph, Peter J. 2017, Sediment anoxia limits microbial-driven seagrass carbon remineralization under warming conditions, FEMS microbiology ecology, vol. 93, no. 6, pp. 1-15, doi: 10.1093/femsec/fix033.

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Title Sediment anoxia limits microbial-driven seagrass carbon remineralization under warming conditions
Author(s) Trevathan-Tackett, Stacey M.
Seymour, Justin R.
Nielsen, Daniel A.
Macreadie, Peter I.ORCID iD for Macreadie, Peter I.
Jeffries, Thomas C.
Sanderman, Jonathan
Baldock, Jeff
Howes, Johanna M.
Steven, Andrew D.L.
Ralph, Peter J.
Journal name FEMS microbiology ecology
Volume number 93
Issue number 6
Article ID fix033
Start page 1
End page 15
Total pages 15
Publisher Oxford University Press
Place of publication Oxford, Eng.
Publication date 2017-06
ISSN 0168-6496
Keyword(s) bacterial remineralization
carbon cycling
oxygen availability
seagrass microbiology
Summary Seagrass ecosystems are significant carbon sinks, and their resident microbial communities ultimately determine the quantity and quality of carbon sequestered. However, environmental perturbations have been predicted to affect microbial-driven seagrass decomposition and subsequent carbon sequestration. Utilizing techniques including 16S-rDNA sequencing, solid-state NMR and microsensor profiling, we tested the hypothesis that elevated seawater temperatures and eutrophication enhance the microbial decomposition of seagrass leaf detritus and rhizome/root tissues. Nutrient additions had a negligible effect on seagrass decomposition, indicating an absence of nutrient limitation. Elevated temperatures caused a 19% higher biomass loss for aerobically decaying leaf detritus, coinciding with changes in bacterial community structure and enhanced lignocellulose degradation. Although, community shifts and lignocellulose degradation were also observed for rhizome/root decomposition, anaerobic decay was unaffected by temperature. These observations suggest that oxygen availability constrains the stimulatory effects of temperature increases on bacterial carbon remineralization, possibly through differential temperature effects on bacterial functional groups, including putative aerobic heterotrophs (e.g. Erythrobacteraceae, Hyphomicrobiaceae) and sulfate-reducers (e.g. Desulfobacteraceae). Consequently, under elevated seawater temperatures, carbon accumulation rates may diminish due to higher remineralization rates at the sediment surface. Nonetheless, the anoxic conditions ubiquitous to seagrass sediments can provide a degree of carbon protection under warming seawater temperatures.
Language eng
DOI 10.1093/femsec/fix033
Field of Research 050101 Ecological Impacts of Climate Change
060701 Phycology (incl Marine Grasses)
06 Biological Sciences
11 Medical And Health Sciences
05 Environmental Sciences
Socio Economic Objective 970105 Expanding Knowledge in the Environmental Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, FEMS
Free to Read? No
Free to Read Start Date 2018-06-02
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Created: Fri, 26 May 2017, 11:58:36 EST

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