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

Trevathan-Tackett, SM; Seymour, JR; Nielsen, DA; Macreadie, PI; Jeffries, TC; Sanderman, J; Baldock, J; Howes, JM; Steven, ADL; Ralph, PJ

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

Trevathan-Tackett, SM

Seymour, JR

Nielsen, DA

Macreadie, PI

Jeffries, TC

Sanderman, J Baldock, J Howes, JM Steven, ADL Ralph, PJ

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Publication Type:: Journal Article
Citation:: FEMS Microbiology Ecology, 2017, 93 (6)
Issue Date:: 2017-06-01

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Field	Value	Language
dc.contributor.author	Trevathan-Tackett, SM https://orcid.org/0000-0002-4977-0757	en_US
dc.contributor.author	Seymour, JR https://orcid.org/0000-0002-3745-6541	en_US
dc.contributor.author	Nielsen, DA https://orcid.org/0000-0001-6678-5937	en_US
dc.contributor.author	Macreadie, PI https://orcid.org/0000-0001-7362-0882	en_US
dc.contributor.author	Jeffries, TC https://orcid.org/0000-0001-6479-0353	en_US
dc.contributor.author	Sanderman, J	en_US
dc.contributor.author	Baldock, J	en_US
dc.contributor.author	Howes, JM	en_US
dc.contributor.author	Steven, ADL	en_US
dc.contributor.author	Ralph, PJ https://orcid.org/0000-0002-3103-7346	en_US
dc.date.available	2017-03-12	en_US
dc.date.issued	2017-06-01	en_US
dc.identifier.citation	FEMS Microbiology Ecology, 2017, 93 (6)	en_US
dc.identifier.issn	0168-6496	en_US
dc.identifier.uri	http://hdl.handle.net/10453/125504
dc.description.abstract	© FEMS 2017. All rights reserved. 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.	en_US
dc.relation	http://purl.org/au-research/grants/arc/LP110200454
dc.relation	http://purl.org/au-research/grants/arc/FT130100218
dc.relation.ispartof	FEMS Microbiology Ecology	en_US
dc.relation.isbasedon	10.1093/femsec/fix033	en_US
dc.subject.classification	Microbiology	en_US
dc.subject.mesh	Proteobacteria	en_US
dc.subject.mesh	Carbon	en_US
dc.subject.mesh	Oxygen	en_US
dc.subject.mesh	RNA, Ribosomal, 16S	en_US
dc.subject.mesh	Ecosystem	en_US
dc.subject.mesh	Biomass	en_US
dc.subject.mesh	Seawater	en_US
dc.subject.mesh	Eutrophication	en_US
dc.subject.mesh	Anaerobiosis	en_US
dc.subject.mesh	Geologic Sediments	en_US
dc.subject.mesh	Hot Temperature	en_US
dc.subject.mesh	Carbon Sequestration	en_US
dc.subject.mesh	Alismatales	en_US
dc.title	Sediment anoxia limits microbial-driven seagrass carbon remineralization under warming conditions	en_US
dc.type	Journal Article
utslib.citation.volume	6	en_US
utslib.citation.volume	93	en_US
utslib.for	0602 Ecology	en_US
utslib.for	1102 Cardiorespiratory Medicine and Haematology	en_US
utslib.for	0501 Ecological Applications	en_US
utslib.for	05 Environmental Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	11 Medical and Health Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	6	en_US
pubs.publication-status	Published	en_US
pubs.volume	93	en_US

Abstract:

© FEMS 2017. All rights reserved. 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.

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http://hdl.handle.net/10453/125504