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| Titel |
Reviews and syntheses: Calculating the global contribution of coralline algae to total carbon burial |
| VerfasserIn |
L. H. van der Heijden, N. A. Kamenos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 12, no. 21 ; Nr. 12, no. 21 (2015-11-10), S.6429-6441 |
| Datensatznummer |
250118159
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| Publikation (Nr.) |
 copernicus.org/bg-12-6429-2015.pdf |
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| Zusammenfassung |
| The ongoing increase in anthropogenic carbon dioxide
(CO2) emissions is changing the global marine environment and is causing
warming and acidification of the oceans. Reduction of CO2 to a
sustainable level is required to avoid further marine change. Many studies
investigate the potential of marine carbon sinks (e.g. seagrass) to mitigate
anthropogenic emissions, however, information on storage by coralline algae
and the beds they create is scant. Calcifying photosynthetic organisms,
including coralline algae, can act as a CO2 sink via photosynthesis and
CaCO3 dissolution and act as a CO2 source during respiration and
CaCO3 production on short-term timescales. Long-term carbon storage
potential might come from the accumulation of coralline algae deposits over
geological timescales. Here, the carbon storage potential of coralline algae
is assessed using meta-analysis of their global organic and inorganic carbon
production and the processes involved in this metabolism. Net organic and
inorganic production were estimated at 330 g C m−2 yr−1 and
900 g CaCO3 m−2 yr−1 respectively giving global
organic/inorganic C production of
0.7/1.8 × 109 t C yr−1. Calcium carbonate production by
free-living/crustose coralline algae (CCA) corresponded to a sediment
accretion of 70/450 mm kyr−1. Using this potential carbon storage for
coralline algae, the global production of free-living algae/CCA was
0.4/1.2 × 109 t C yr−1 suggesting a total potential
carbon sink of 1.6 × 109 tonnes per year. Coralline algae
therefore have production rates similar to mangroves, salt marshes and
seagrasses representing an as yet unquantified but significant carbon store,
however, further empirical investigations are needed to determine the
dynamics and stability of that store. |
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