Responses of marine benthic microalgae to elevated CO<inf>2</inf>
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Increasing anthropogenic CO2emissions to the atmosphere are causing a rise in pCO2concentrations 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 CO2levels on the colonisation of artificial substrata by microalgal assemblages (periphyton) were examined across a CO2gradient off the volcanic island of Vulcano (NE Sicily). We show that periphyton communities altered significantly as CO2concentrations increased. CO2enrichment 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 CO2levels increased. The responses of benthic microalgae to rising anthropogenic CO2emissions are likely to have significant ecological ramifications for coastal systems. © 2011 Springer-Verlag.
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