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Effects of calcification on air-water CO2 fluxes in tropical seagrass meadows: A mesocosm experiment
Stockholm University, Sweden; University of Dar es Salaam, Tanzania.
University of Gothenburg, Sweden.
Södertörns högskola, Institutionen för naturvetenskap, miljö och teknik, Miljövetenskap.ORCID-id: 0000-0002-7552-2431
Stockholm University, Sweden; Tanzania Fisheries Research Institute (TAFIRI), Tanzania.
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2023 (Engelska)Ingår i: Journal of Experimental Marine Biology and Ecology, ISSN 0022-0981, E-ISSN 1879-1697, Vol. 561, artikel-id 151864Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Seagrass meadows deliver a range of ecosystem services, where one of the more important is the capacity to store carbon and serve as sinks for atmospheric carbon dioxide. The capacity of seagrass meadows for carbon storage might, however, be modified and complicated by several factors; one important factor is the possible effects of calcification within the meadows. In tropical areas, seagrass meadows can contain high proportions of calcareous organisms, which through their calcification may cause release of CO2. To study this aspect of the CO2 balance within tropical seagrass systems, we investigated the air-water CO2 flux in seagrass mesocosms with different plant community compositions, i.e. mixtures of seagrass and calcifying macroalgae, having similar overall photosynthetic oxygen evolution rates. The measured CO2 fluxes changed both in rate and direction over the day and were significantly related to plant community composition. Downward fluxes of CO2 were found only over vegetation with high proportion of seagrass and in the afternoon, whereas occurrence of calcifying algae appeared to reverse the flow. A partial least squares (PLS) regression model indicated that pH, pCO2 and dissolved inorganic carbon (DIC) were the primary environmental variables predicting the CO2 fluxes. Our findings show that algal calcification might partly counteract the carbon sequestration in seagrass meadows.

Ort, förlag, år, upplaga, sidor
Elsevier, 2023. Vol. 561, artikel-id 151864
Nyckelord [en]
Blue carbon, Calcification, Carbon sinks, Climate change mitigation, Plant community composition, Primary productivity, Seagrass ecosystem
Nationell ämneskategori
Ekologi
Identifikatorer
URN: urn:nbn:se:sh:diva-50712DOI: 10.1016/j.jembe.2022.151864ISI: 000920764200001Scopus ID: 2-s2.0-85146001769OAI: oai:DiVA.org:sh-50712DiVA, id: diva2:1729741
Projekt
Climate mitigation services of coastal seascapes
Forskningsfinansiär
Sida - Styrelsen för internationellt utvecklingssamarbeteVetenskapsrådet, 2019–04038Tillgänglig från: 2023-01-23 Skapad: 2023-01-23 Senast uppdaterad: 2023-03-06Bibliografiskt granskad

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Gullström, MartinDahl, Martin

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Totalt: 90 träffar
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