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Carbonate chemistry...
Carbonate chemistry in the microenvironment within cyanobacterial aggregates under present-day and future pCO(2) levels
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- Eichner, Meri (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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Wolf-Gladrow, D. (författare)
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- Ploug, Helle (författare)
- Gothenburg University,Göteborgs universitet,Institutionen för marina vetenskaper,Department of marine sciences
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(creator_code:org_t)
- 2021-11-27
- 2022
- Engelska.
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Ingår i: Limnology and Oceanography. - : Wiley. - 0024-3590 .- 1939-5590. ; 67:1, s. 203-218
- Relaterad länk:
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https://onlinelibrar...
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https://gup.ub.gu.se...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Photosynthesis and respiration cause distinct chemical microenvironments within cyanobacterial aggregates. Here, we used microsensors and a diffusion-reaction model to characterize gradients in carbonate chemistry and investigate how these are affected by ocean acidification in Baltic vs. Pacific aggregates (Nodularia and Dolichospermum vs. Trichodesmium). Microsensor measurements of O-2 and pH were performed under in situ and expected future pCO(2) levels on Nodularia and Dolichospermum aggregates collected in the Baltic Sea. Under in situ conditions, O-2 and pH levels within the aggregates covered ranges of 80-175% air saturation and 7.7-9.4 in dark and light, respectively. Carbon uptake in the light was predicted to reduce HCO3- by 100-150 mu mol L-1 and CO2 by 3-6 mu mol L-1 in the aggregate center compared to outside, inducing strong CO2 depletion (down to 0.5 mu mol L-1 CO2 remaining in the center) even when assuming that HCO3- covered 80-90% of carbon uptake. Under ocean acidification conditions, enhanced CO2 availability allowed for significantly lower activity of carbon concentrating mechanisms, including a reduction of the contribution of HCO3- to carbon uptake by up to a factor of 10. The magnification of proton gradients under elevated pCO(2) that was predicted based on a lower buffer capacity was observed in measurements despite a concurrent decrease in photosynthetic activity. In summary, we provide a quantitative image of the inorganic carbon environment in cyanobacterial aggregates under present-day and expected future conditions, considering both the individual and combined effects of the chemical and biological processes that shape these environments.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
Nyckelord
- ocean acidification
- baltic sea
- trichodesmium
- diversity
- components
- ph
- acquisition
- mechanisms
- prospects
- colonies
- Marine & Freshwater Biology
- Oceanography
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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