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Ocean acidification (OA) is expected to negatively affect coral reefs, however little is known about how OA will change the coral-algal symbiosis on which reefs ultimately depend. This study investigated whether there would be differences in coral  Symbiodinium  types in response to OA, potentially improving coral performance. We used denaturing gradient gel electrophoresis (DGGE) of the internal transcribed spacer 2 (ITS2) region of ribosomal DNA to investigate the dominant types of  Symbiodinium  associating with six species of scleractinian coral that were exposed to elevated partial pressures of carbon dioxide (pCO 2 )  in situ  from settlement and throughout their lives. The study was conducted at three naturally occurring volcanic CO 2  seeps (pCO 2  ∼500 to 900 ppm, pH Total  7.8 – 7.9) and adjacent control areas (pCO 2  ∼390 ppm, pH Total  ∼8.0 – 8.05) in Papua New Guinea. The  Symbiodinium  associated with corals living in an extreme seep site (pCO 2  >1000 ppm) were also examined. Ten clade C types and three clade D types dominated the 443 coral samples.  Symbiodinium  types strongly contrasted between coral species, however, no differences were observed due to CO 2  exposure. Within five species, 85 – 95% of samples exhibited the same  Symbiodinium  type across all sites, with remaining rare types having no patterns attributable to CO 2  exposure. The sixth species of coral displayed site specific differences in  Symbiodinium  types, unrelated to CO 2  exposure. Symbiodinium types from the coral inhabiting the extreme CO 2  seep site were found commonly throughout the moderate seeps and control areas. Our finding that symbiotic associations did not change in response to CO 2  exposure suggest that, within the six coral hosts, none of the investigated 13 clade C and D  Symbiodinium  types had a selective advantage at high pCO 2 . Acclimatisation through changing symbiotic association therefore does not seem to be an option for Indo-Pacific corals to deal with future OA.

Symbiodinium Community Composition in Scleractinian Corals Is Not Affected by Life-Long Exposure to Elevated Carbon Dioxide