Dynamics and fate of blue carbon in a mangrove–seagrass seascape: influence of landscape configuration and land-use change
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Published:2021-03-01
Issue:5
Volume:36
Page:1489-1509
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ISSN:0921-2973
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Container-title:Landscape Ecology
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language:en
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Short-container-title:Landscape Ecol
Author:
Asplund Maria E.ORCID, Dahl Martin, Ismail Rashid O., Arias-Ortiz Ariane, Deyanova Diana, Franco João N., Hammar Linus, Hoamby Arielle I., Linderholm Hans W., Lyimo Liberatus D., Perry Diana, Rasmusson Lina M., Ridgway Samantha N., Salgado Gispert Gloria, D’Agata Stéphanie, Glass Leah, Mahafina Jamal Angelot, Ramahery Volanirina, Masque Pere, Björk Mats, Gullström Martin
Abstract
Abstract
Context
Seagrass meadows act as efficient natural carbon sinks by sequestering atmospheric CO2 and through trapping of allochthonous organic material, thereby preserving organic carbon (Corg) in their sediments. Less understood is the influence of landscape configuration and transformation (land-use change) on carbon sequestration dynamics in coastal seascapes across the land–sea interface.
Objectives
We explored the influence of landscape configuration and degradation of adjacent mangroves on the dynamics and fate of Corg in seagrass habitats.
Methods
Through predictive modelling, we assessed sedimentary Corg content, stocks and source composition in multiple seascapes (km-wide buffer zones) dominated by different seagrass communities in northwest Madagascar. The study area encompassed seagrass meadows adjacent to intact and deforested mangroves.
Results
The sedimentary Corg content was influenced by a combination of landscape metrics and inherent habitat plant- and sediment-properties. We found a strong land-to-sea gradient, likely driven by hydrodynamic forces, generating distinct patterns in sedimentary Corg levels in seagrass seascapes. There was higher Corg content and a mangrove signal in seagrass surface sediments closer to the deforested mangrove area, possibly due to an escalated export of Corg from deforested mangrove soils. Seascapes comprising large continuous seagrass meadows had higher sedimentary Corg levels in comparison to more diverse and patchy seascapes.
Conclusion
Our results emphasize the benefit to consider the influence of seascape configuration and connectivity to accurately assess Corg content in coastal habitats. Understanding spatial patterns of variability and what is driving the observed patterns is useful for identifying carbon sink hotspots and develop management prioritizations.
Funder
Global Environment Facility Swedish International Development Cooperation Agency - Sida, marine bilateral programme Australian Research Council LIEF Project Generalitat de Catalunya ICTA Unit of Excellence University of Gothenburg
Publisher
Springer Science and Business Media LLC
Subject
Nature and Landscape Conservation,Ecology,Geography, Planning and Development
Reference83 articles.
1. Alongi DM, Boto KG, Tirendi F (1989) Effect of exported mangrove litter on bacterial productivity and dissolved organic carbon fluxes in adjacent tropical nearshore sediments. Mar Ecol Prog Ser 56:133–144 2. Arias-Ortiz A, Masqué P, Garcia-Orellana J, Serrano O, Mazarrasa I, Marbà N, Lovelock CE, Lavery PS, Duarte CM (2018) Reviews and syntheses: 210Pb-derived sediment and carbon accumulation rates in vegetated coastal ecosystems: setting the record straight. Biogeoscience 15:6791–6818 3. Arias-Ortiz A, Masqué P, Glass L, Benson L, Kennedy H, Duarte CM, García Orellana J, Benítez Nelson CR, Humphries MS, Ratefinjanahary I, Ravelonjatovo J, Lovelock CE (2020) Losses of soil organic carbon with deforestation in mangroves of Madagascar. Ecosystems. https://doi.org/10.1007/s10021-020-00500-z 4. Avnimelech Y, Ritvo G, Meijer LE, Kochba M (2001) Water content, organic carbon and dry bulk density in flooded sediments. Aquac Eng 25:25–33 5. Belshe EF, Hoeijmakers D, Herran N, Mtolera M, Teichberg M (2018) Seagrass community-level controls over organic carbon storage are constrained by geophysical attributes within meadows of Zanzibar, Tanzania. Biogeoscience 15:4609–4626
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