Get access

Consequences of increased temperature and acidification on bacterioplankton community composition during a mesocosm spring bloom in the Baltic Sea

Authors

  • Markus V. Lindh,

    1. Centre for Ecology and Evolution in Microbial model Systems – EEMiS, Linnaeus University, Kalmar, Sweden
    Search for more papers by this author
  • Lasse Riemann,

    1. Marine Biological Section, Department of Biology, University of Copenhagen, Helsingør, Denmark
    Search for more papers by this author
  • Federico Baltar,

    1. Centre for Ecology and Evolution in Microbial model Systems – EEMiS, Linnaeus University, Kalmar, Sweden
    Search for more papers by this author
  • Claudia Romero-Oliva,

    1. Centre for Ecology and Evolution in Microbial model Systems – EEMiS, Linnaeus University, Kalmar, Sweden
    Current affiliation:
    1. Ecological Impact Research and Ecotoxicology, Institute of Ecology, Berlin Institute of Technology, Berlin, Germany
    Search for more papers by this author
  • Paulo S. Salomon,

    1. Centre for Ecology and Evolution in Microbial model Systems – EEMiS, Linnaeus University, Kalmar, Sweden
    Current affiliation:
    1. Marine Biology Department, Biology Institute, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
    Search for more papers by this author
  • Edna Granéli,

    1. Centre for Ecology and Evolution in Microbial model Systems – EEMiS, Linnaeus University, Kalmar, Sweden
    Search for more papers by this author
  • Jarone Pinhassi

    Corresponding author
    • Centre for Ecology and Evolution in Microbial model Systems – EEMiS, Linnaeus University, Kalmar, Sweden
    Search for more papers by this author

For correspondence. E-mail jarone.pinhassi@lnu.se; Tel. (+46) 480446212; Fax (+46) 480447305.

Summary

Despite the paramount importance of bacteria for biogeochemical cycling of carbon and nutrients, little is known about the potential effects of climate change on these key organisms. The consequences of the projected climate change on bacterioplankton community dynamics were investigated in a Baltic Sea spring phytoplankton bloom mesocosm experiment by increasing temperature with 3°C and decreasing pH by approximately 0.4 units via CO2 addition in a factorial design. Temperature was the major driver of differences in community composition during the experiment, as shown by denaturing gradient gel electrophoresis (DGGE) of amplified 16S rRNA gene fragments. Several bacterial phylotypes belonging to Betaproteobacteria were predominant at 3°C but were replaced by members of the Bacteriodetes in the 6°C mesocosms. Acidification alone had a limited impact on phylogenetic composition, but when combined with increased temperature, resulted in the proliferation of specific microbial phylotypes. Our results suggest that although temperature is an important driver in structuring bacterioplankton composition, evaluation of the combined effects of temperature and acidification is necessary to fully understand consequences of climate change for marine bacterioplankton, their implications for future spring bloom dynamics, and their role in ecosystem functioning.

Get access to the full text of this article

Ancillary