Seagrass meadows as a globally significant carbonate reservoir

Handle URI:
http://hdl.handle.net/10754/577017
Title:
Seagrass meadows as a globally significant carbonate reservoir
Authors:
Mazarrasa, I.; Marbà, N.; Lovelock, C. E.; Serrano, O.; Lavery, P. S.; Fourqurean, J. W.; Kennedy, H.; Mateo, M. A.; Krause-Jensen, D.; Steven, A. D. L.; Duarte, Carlos M. ( 0000-0002-1213-1361 )
Abstract:
There has been growing interest in quantifying the capacity of seagrass ecosystems to act as carbon sinks as a natural way of offsetting anthropogenic carbon emissions to the atmosphere. However, most of the efforts have focused on the particulate organic carbon (POC) stocks and accumulation rates and ignored the particulate inorganic carbon (PIC) fraction, despite important carbonate pools associated with calcifying organisms inhabiting the meadows, such as epiphytes and benthic invertebrates, and despite the relevance that carbonate precipitation and dissolution processes have in the global carbon cycle. This study offers the first assessment of the global PIC stocks in seagrass sediments using a synthesis of published and unpublished data on sediment carbonate concentration from 403 vegetated and 34 adjacent un-vegetated sites. PIC stocks in the top 1 m of sediment ranged between 3 and 1660 Mg PIC ha<sup>−1</sup>, with an average of 654 ± 24 Mg PIC ha<sup>−1</sup>, exceeding those of POC reported in previous studies by about a factor of 5. Sedimentary carbonate stocks varied across seagrass communities, with meadows dominated by <i>Halodule</i>, <i>Thalassia</i> or <i>Cymodocea</i> supporting the highest PIC stocks, and tended to decrease polewards at a rate of −8 ± 2 Mg PIC ha<sup>−1</sup> per degree of latitude (general linear model, GLM; <i>p</i> < 0.0003). Using PIC concentrations and estimates of sediment accretion in seagrass meadows, the mean PIC accumulation rate in seagrass sediments is found to be 126.3 ± 31.05 g PIC m<sup>−2</sup> yr<sup>−1</sup>. Based on the global extent of seagrass meadows (177 000 to 600 000 km<sup>2</sup>), these ecosystems globally store between 11 and 39 Pg of PIC in the top metre of sediment and accumulate between 22 and 75 Tg PIC yr<sup>−1</sup>, representing a significant contribution to the carbonate dynamics of coastal areas. Despite the fact that these high rates of carbonate accumulation imply CO<sub>2</sub> emissions from precipitation, seagrass meadows are still strong CO<sub>2</sub> sinks as demonstrated by the comparison of carbon (PIC and POC) stocks between vegetated and adjacent un-vegetated sediments.
KAUST Department:
Red Sea Research Center (RSRC)
Citation:
Seagrass meadows as a globally significant carbonate reservoir 2015, 12 (16):4993 Biogeosciences
Journal:
Biogeosciences
Issue Date:
24-Aug-2015
DOI:
10.5194/bg-12-4993-2015; 10.5194/bgd-12-4107-2015
Type:
Article
ISSN:
1726-4189
Additional Links:
http://www.biogeosciences.net/12/4993/2015/; http://www.biogeosciences-discuss.net/12/4107/2015/
Appears in Collections:
Articles; Red Sea Research Center (RSRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorMazarrasa, I.en
dc.contributor.authorMarbà, N.en
dc.contributor.authorLovelock, C. E.en
dc.contributor.authorSerrano, O.en
dc.contributor.authorLavery, P. S.en
dc.contributor.authorFourqurean, J. W.en
dc.contributor.authorKennedy, H.en
dc.contributor.authorMateo, M. A.en
dc.contributor.authorKrause-Jensen, D.en
dc.contributor.authorSteven, A. D. L.en
dc.contributor.authorDuarte, Carlos M.en
dc.date.accessioned2015-09-09T13:41:19Zen
dc.date.available2015-09-09T13:41:19Zen
dc.date.issued2015-08-24en
dc.identifier.citationSeagrass meadows as a globally significant carbonate reservoir 2015, 12 (16):4993 Biogeosciencesen
dc.identifier.issn1726-4189en
dc.identifier.doi10.5194/bg-12-4993-2015en
dc.identifier.doi10.5194/bgd-12-4107-2015en
dc.identifier.urihttp://hdl.handle.net/10754/577017en
dc.description.abstractThere has been growing interest in quantifying the capacity of seagrass ecosystems to act as carbon sinks as a natural way of offsetting anthropogenic carbon emissions to the atmosphere. However, most of the efforts have focused on the particulate organic carbon (POC) stocks and accumulation rates and ignored the particulate inorganic carbon (PIC) fraction, despite important carbonate pools associated with calcifying organisms inhabiting the meadows, such as epiphytes and benthic invertebrates, and despite the relevance that carbonate precipitation and dissolution processes have in the global carbon cycle. This study offers the first assessment of the global PIC stocks in seagrass sediments using a synthesis of published and unpublished data on sediment carbonate concentration from 403 vegetated and 34 adjacent un-vegetated sites. PIC stocks in the top 1 m of sediment ranged between 3 and 1660 Mg PIC ha<sup>−1</sup>, with an average of 654 ± 24 Mg PIC ha<sup>−1</sup>, exceeding those of POC reported in previous studies by about a factor of 5. Sedimentary carbonate stocks varied across seagrass communities, with meadows dominated by <i>Halodule</i>, <i>Thalassia</i> or <i>Cymodocea</i> supporting the highest PIC stocks, and tended to decrease polewards at a rate of −8 ± 2 Mg PIC ha<sup>−1</sup> per degree of latitude (general linear model, GLM; <i>p</i> < 0.0003). Using PIC concentrations and estimates of sediment accretion in seagrass meadows, the mean PIC accumulation rate in seagrass sediments is found to be 126.3 ± 31.05 g PIC m<sup>−2</sup> yr<sup>−1</sup>. Based on the global extent of seagrass meadows (177 000 to 600 000 km<sup>2</sup>), these ecosystems globally store between 11 and 39 Pg of PIC in the top metre of sediment and accumulate between 22 and 75 Tg PIC yr<sup>−1</sup>, representing a significant contribution to the carbonate dynamics of coastal areas. Despite the fact that these high rates of carbonate accumulation imply CO<sub>2</sub> emissions from precipitation, seagrass meadows are still strong CO<sub>2</sub> sinks as demonstrated by the comparison of carbon (PIC and POC) stocks between vegetated and adjacent un-vegetated sediments.en
dc.language.isoenen
dc.relation.urlhttp://www.biogeosciences.net/12/4993/2015/en
dc.relation.urlhttp://www.biogeosciences-discuss.net/12/4107/2015/en
dc.rightsThis work is distributed under the Creative Commons Attribution 3.0 License.en
dc.titleSeagrass meadows as a globally significant carbonate reservoiren
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.identifier.journalBiogeosciencesen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Global Change Research, IMEDEA (CSIC-UIB) Institut Mediterrani d'Estudis Avançats, C/Miguel Marqués 21, 07190 Esporles (Mallorca), Spainen
dc.contributor.institutionSchool of Biological Sciences, The University of Queensland, St Lucia, QLD, 4072, Australiaen
dc.contributor.institutionThe UWA Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australiaen
dc.contributor.institutionSchool of Natural Sciences, Centre for Marine Ecosystems Research, Edith Cowan University, Joondalup WA 6027, Australiaen
dc.contributor.institutionDepartment of Biological Sciences and Southeast Environmental Research Center, Florida International University (FIU), 11200 SW 8th Street, Miami, Florida 33199, USAen
dc.contributor.institutionSchool of Ocean Sciences, College of Natural Sciences, Bangor University, Askew Street, Menai Bridge, LL59 5AB, UKen
dc.contributor.institutionCentro de Estudios Avanzados de Blanes, Consejo Superior de Investigaciones Científicas, Acceso Cala St. Francesc 14, 17300 Blanes, Spainen
dc.contributor.institutionDepartment of Bioscience, Aarhus University, Vejlsøvej 25, 8600 Silkeborg, Denmarken
dc.contributor.institutionArctic Research Centre, Aarhus University, C.F. Møllers Allé 8, 8000 Aarhus, Denmarken
dc.contributor.institutionCSIRO, EcoSciences Precinct, Dutton Park 41 Boggo Road Dutton Park QLD 4102, Australiaen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorDuarte, Carlos M.en
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