Elevated CO2induces a bloom of microphytobenthos within a shell gravel mesocosm

Tait, K; Beesley, A; Findlay, HS; McNeill, CL; Widdicombe, S; Sobecky, P. 2015 Elevated CO2induces a bloom of microphytobenthos within a shell gravel mesocosm. FEMS Microbiology Ecology, 91 (8). fiv092. 10.1093/femsec/fiv092

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Official URL: https://doi.org/10.1093/femsec/fiv092

Abstract/Summary

The geological storage of carbon dioxide (CO2) is expected to be an important component of future global carbon emission mitigation, but there is a need to understand the impacts of a CO2 leak on the marine environment and to develop monitoring protocols for leakage detection. In the present study, sediment cores were exposed to CO2-acidified seawater at one of five pH levels (8.0, 7.5, 7.0, 6.5 and 6.0) for 10 weeks. A bloom of Spirulina sp. and diatoms appeared on sediment surface exposed to pH 7.0 and 7.5 seawater. Quantitative PCR measurements of the abundance of 16S rRNA also indicated an increase within the pH 7.0 and 7.5 treatments after 10 weeks incubation. More detailed analysis of the microbial communities from the pH 7.0, 7.5 and 8.0 treatments confirmed an increase in the relative abundance of Spirulina sp. and Navicula sp. sequences, with changes in the relative abundance of major archaeal and bacterial groups also detected within the pH 7.0 treatment. A decreased flux of silicate from the sediment at this pH was also detected. Monitoring blooms of microphytobenthos may prove useful as an indicator of CO2 leakage within coastal areas

Item Type: Publication - Article
Subjects: Marine Sciences
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Karen Tait
Date made live: 11 Oct 2017 11:53
Last Modified: 11 Oct 2017 11:53
URI: http://plymsea.ac.uk/id/eprint/7539

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