Response of seagrass 'blue carbon' stocks to increased water temperatures

Macreadie, Peter I. and Hardy, Simon S. S. 2018, Response of seagrass 'blue carbon' stocks to increased water temperatures, Diversity, vol. 10, no. 4, Special Issue: Effects of Human Disturbances and Climate Forcing on Marine Vegetation), pp. 1-9, doi: 10.3390/d10040115.

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Title Response of seagrass 'blue carbon' stocks to increased water temperatures
Author(s) Macreadie, Peter I.ORCID iD for Macreadie, Peter I. orcid.org/0000-0001-7362-0882
Hardy, Simon S. S.
Journal name Diversity
Volume number 10
Issue number 4
Season Special Issue: Effects of Human Disturbances and Climate Forcing on Marine Vegetation)
Article ID 115
Start page 1
End page 9
Total pages 9
Publisher MDPI
Place of publication Basel, Switzerland
Publication date 2018
ISSN 1424-8220
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Ecology
Multidisciplinary Sciences
Environmental Sciences & Ecology
Science & Technology - Other Topics
Blue Carbon
warming
temperature
seagrass ecosystem
disturbance
soil organic carbon
ORGANIC-CARBON
DECOMPOSITION
ECOSYSTEMS
FEEDBACKS
Summary Seagrass meadows are globally important sinks of ‘Blue Carbon’, but warming watertemperatures due to climate change may undermine their capacity to sequester and retainorganic carbon (Corg). We tested the effects of warming on seagrass Corg stocks in situ bytransplanting seagrass soil cores along a thermal plume generated by a coal-fired power plantin a seagrass-dominated estuary (Lake Macquarie, Australia). Transplanted cores were subjectedto temperatures 2 and 4 ◦C above ambient temperatures and Corg content was measured after7, 30, 90 and 180 days. We were unable to detect any significant effect of warming on Corgconcentration, stocks, chemical composition (as measured by labile, recalcitrant, refractory ratios),or microbial abundance at any time point. In fact, Corg levels were temporally variable. These findingscontrast those of previous studies (mostly laboratory-based) that have reported increases in microbialremineralisation (breakdown) of Corg in response to warming. To explain the lack of any detectablewarming effect, we suggest that higher temperatures, longer durations of warming exposure,or additional stressors (e.g., oxygen exposure) may be needed to overcome microbial activationbarriers and stimulate Corg remineralisation.
Language eng
DOI 10.3390/d10040115
Field of Research 0301 Analytical Chemistry
0906 Electrical And Electronic Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2018, The Authors
Persistent URL http://hdl.handle.net/10536/DRO/DU:30117168

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