Paul, Allanah; Sommer, Ulrich (2018): Indoor mesocosm experiment 2013 on effects of increased CO2 concentration on nutrient limited coastal summer plankton: Phytoplankton biomass. PANGAEA, https://doi.org/10.1594/PANGAEA.889314, Supplement to: Paul, Allanah; 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, https://doi.org/10.3354/meps12632
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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.
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.
|#||Name||Short Name||Unit||Principal Investigator||Method||Comment|
|2||Day of experiment||DOE||day||Paul, Allanah|
|3||Mesocosm label||Meso label||Paul, Allanah|
|4||Sample code/label||Sample label||Paul, Allanah||climate chamber number|
|5||Phase||Phase||Paul, Allanah||b = bloom, p = post-bloom|
|6||Treatment: temperature||Treat temp||°C||Paul, Allanah|
|7||Nodularia spp., biomass||Nodularia spp. biom||µg/l||Sommer, Ulrich|
|8||Dolichospermum spp., biomass||Dolichospermum spp. biom||µg/l||Sommer, Ulrich|
|9||Nostoc sp., biomass as carbon||Nostoc sp. C||µg/l||Sommer, Ulrich|
|10||Phytoplankton, biomass||Phytopl||µg/l||Sommer, Ulrich||Total phytoplankton biomass|
|11||Ratio||Ratio||%||Paul, Allanah||% Nostocales biomass|
|12||δ15N||δ15N||‰ air||Paul, Allanah||suspended particulate material|
|13||Phosphate, organic, dissolved||DOP||µmol/l||Paul, Allanah|
|14||Phosphate||[PO4]3-||µmol/l||Paul, Allanah||Excess dissolved inorganic phosphate|
3130 data points