Baltic Sea diazotrophic cyanobacterium is negatively affected by acidification and warming.

Paul, Allanah J., Sommer, Ulrich, Paul, Carolin and Riebesell, Ulf (2018) Baltic Sea diazotrophic cyanobacterium is negatively affected by acidification and warming. Open Access Marine Ecology Progress Series, 598 . pp. 49-60. DOI 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, two drivers of marked future change in the marine environment. Here, we enclosed a natural plankton community in twelve indoor mesocosms (volume ~1400 L) and manipulated pCO2 to yield six CO2 treatments with two 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 four weeks. 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 future.

Document Type: Article
Keywords: Cyanobacteria; Environmental change; Baltic Sea; Nitrogen fixation; Nodularia spumigena
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
OceanRep > The Future Ocean - Cluster of Excellence > FO-R09
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: No
Publisher: Inter Research
Projects: BIOACID, Future Ocean
Date Deposited: 03 Jul 2018 08:43
Last Modified: 08 Feb 2021 07:33

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