Marine Biology

, Volume 160, Issue 8, pp 1813–1824

Responses of marine benthic microalgae to elevated CO2

  • V. R. Johnson
  • C. Brownlee
  • R. E. M. Rickaby
  • M. Graziano
  • M. Milazzo
  • J. M. Hall-Spencer
Original Paper

Abstract

Increasing anthropogenic CO2 emissions to the atmosphere are causing a rise in pCO2 concentrations in the ocean surface and lowering pH. To predict the effects of these changes, we need to improve our understanding of the responses of marine primary producers since these drive biogeochemical cycles and profoundly affect the structure and function of benthic habitats. The effects of increasing CO2 levels on the colonisation of artificial substrata by microalgal assemblages (periphyton) were examined across a CO2 gradient off the volcanic island of Vulcano (NE Sicily). We show that periphyton communities altered significantly as CO2 concentrations increased. CO2 enrichment caused significant increases in chlorophyll a concentrations and in diatom abundance although we did not detect any changes in cyanobacteria. SEM analysis revealed major shifts in diatom assemblage composition as CO2 levels increased. The responses of benthic microalgae to rising anthropogenic CO2 emissions are likely to have significant ecological ramifications for coastal systems.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • V. R. Johnson
    • 1
  • C. Brownlee
    • 2
  • R. E. M. Rickaby
    • 3
  • M. Graziano
    • 4
    • 5
  • M. Milazzo
    • 5
  • J. M. Hall-Spencer
    • 1
  1. 1.Marine Biology and Ecology Research Centre, Marine InstituteUniversity of PlymouthPlymouthUK
  2. 2.The Marine Biological Association of the United Kingdom (MBA), The LaboratoryPlymouthUK
  3. 3.Department of Earth SciencesUniversity of OxfordOxfordUK
  4. 4.CNR-Institute of Atmospheric Pollution Research, UNICAL-PolifunzionaleRendeItaly
  5. 5.Dipartimento di Scienze della Terra e del MareUniversity of PalermoPalermoItaly

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