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Paul, Allanah J; Sommer, Ulrich (2018): Indoor mesocosm experiment 2013 on effects of increased CO2 concentration on nutrient limited coastal summer plankton: Phytoplankton biomass. PANGAEA,, Supplement to: Paul, Allanah J; Sommer, Ulrich; Paul, Carolin; Riebesell, Ulf (2018): Baltic Sea diazotrophic cyanobacterium is negatively affected by acidification and warming. Marine Ecology Progress Series, 598, 49-60,

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Nitrogen fixation is a key source of nitrogen in the Baltic Sea which counteracts nitrogen loss processes in the deep anoxic basins. Laboratory and field studies have indicated that single-strain nitrogen-fixing (diazotrophic) cyanobacteria from the Baltic Sea are sensitive to ocean acidification and warming, 2 drivers of marked future change in the marine environment. Here, we enclosed a natural plankton community in 12 indoor mesocosms (volume ~1400 l) and manipulated partial pressure of carbon dioxide ( pCO2) in seawater to yield 6 CO2 treatments with 2 different temperature treatments (16.6°C and 22.4°C, pCO2 range = 360-2030 µatm). We followed the filamentous, heterocystous diazotrophic cyanobacteria community (Nostocales, primarily Nodularia spumigena) over 4 wk. Our results indicate that heterocystous diazotrophic cyanobacteria may become less competitive in natural plankton communities under ocean acidification. Elevated CO2 had a negative impact on Nodularia sp. biomass, which was exacerbated by warming. Our results imply that Nodularia sp. may contribute less to new nitrogen inputs in the Baltic Sea in the future.
Related to:
Paul, Carolin; Sommer, Ulrich; Garzke, Jessica; Moustaka-Gouni, Maria; Paul, Allanah J; Matthiessen, Birte (2015): Effects of increased CO2 concentration on nutrient limited coastal summer plankton depend on temperature. PANGAEA,
Date/Time Start: 2013-08-14T00:00:00 * Date/Time End: 2013-09-13T00:00:00
We defined the post-bloom phase as the phase when phytoplankton biomass was in decline and below 100 μg C l−1 on average across all treatments.
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DATE/TIMEDate/TimePaul, Allanah JGeocode
2Day of experimentDOEdayPaul, Allanah J
3Mesocosm labelMeso labelPaul, Allanah J
4Sample code/labelSample labelPaul, Allanah Jclimate chamber number
5PhasePhasePaul, Allanah Jb = bloom, p = post-bloom
6Treatment: temperatureTreat temp°CPaul, Allanah J
7Nodularia spp., biomassNodularia spp. biomµg/lSommer, Ulrich
8Dolichospermum spp., biomassDolichospermum spp. biomµg/lSommer, Ulrich
9Nostoc sp., biomass as carbonNostoc sp. Cµg/lSommer, Ulrich
10Phytoplankton, biomassPhytoplµg/lSommer, UlrichTotal phytoplankton biomass
11RatioRatio%Paul, Allanah J% Nostocales biomass
12δ15Nδ15N‰ airPaul, Allanah Jsuspended particulate material
13Phosphate, organic, dissolvedDOPµmol/lPaul, Allanah J
14Phosphate[PO4]3-µmol/lPaul, Allanah JExcess dissolved inorganic phosphate
3130 data points

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