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Comparison of marine macrophytes for their contributions to blue carbon sequestration

Trevathan-Tackett, Stacey, Kelleway, Jeffrey, Macreadie, Peter I., Beardall, John, Ralph, Peter and Bellgrove, Alecia 2015, Comparison of marine macrophytes for their contributions to blue carbon sequestration, Ecology, vol. 96, no. 11, pp. 3043-3057, doi: 10.1890/15-0149.1.

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Title Comparison of marine macrophytes for their contributions to blue carbon sequestration
Author(s) Trevathan-Tackett, Stacey
Kelleway, Jeffrey
Macreadie, Peter I.ORCID iD for Macreadie, Peter I.
Beardall, John
Ralph, Peter
Bellgrove, AleciaORCID iD for Bellgrove, Alecia
Journal name Ecology
Volume number 96
Issue number 11
Start page 3043
End page 3057
Total pages 15
Publisher Wiley
Place of publication London, Eng.
Publication date 2015-11
ISSN 0012-9658
Keyword(s) Science & Technology
Life Sciences & Biomedicine
Environmental Sciences & Ecology
blue carbon
carbon sequestration
plant cell wall
Summary Many marine ecosystems have the capacity for long-term storage of organic carbon (C) in what are termed "blue carbon" systems. While blue carbon systems (saltmarsh, mangrove, and seagrass) are efficient at long-term sequestration of organic carbon (C), much of their sequestered C may originate from other (allochthonous) habitats. Macroalgae, due to their high rates of production, fragmentation, and ability to be transported, would also appear to be able to make a significant contribution as C donors to blue C habitats. In order to assess the stability of macroalgal tissues and their likely contribution to long-term pools of C, we applied thermogravimetric analysis (TGA) to 14 taxa of marine macroalgae and coastal vascular plants. We assessed the structural complexity of multiple lineages of plant and tissue types with differing cell wall structures and found that decomposition dynamics varied significantly according to differences in cell wall structure and composition among taxonomic groups and tissue function (photosynthetic vs. attachment). Vascular plant tissues generally exhibited greater stability with a greater proportion of mass loss at temperatures > 300 degrees C (peak mass loss -320 degrees C) than macroalgae (peak mass loss between 175-300 degrees C), consistent with the lignocellulose matrix of vascular plants. Greater variation in thermogravimetric signatures within and among macroalgal taxa, relative to vascular plants, was also consistent with the diversity of cell wall structure and composition among groups. Significant degradation above 600 degrees C for some macroalgae, as well as some belowground seagrass tissues, is likely due to the presence of taxon-specific compounds. The results of this study highlight the importance of the lignocellulose matrix to the stability of vascular plant sources and the potentially significant role of refractory, taxon-specific compounds (carbonates, long-chain lipids, alginates, xylans, and sulfated polysaccharides) from macroalgae and seagrasses for their long-term sedimentary C storage. This study shows that marine macroalgae do contain refractory compounds and thus may be more valuable to long-term carbon sequestration than we previously have considered.
Language eng
DOI 10.1890/15-0149.1
Field of Research 060701 Phycology (incl Marine Grasses)
0501 Ecological Applications
0602 Ecology
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Grant ID DE130101084
Copyright notice ©2015, Wiley
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