Figure 2
From: Detecting Photosymbiosis in Fossil Scleractinian Corals
Mean δ15N of the organic matrix of coral samples. White and grey boxes differentiate samples, whereas dashed lines separate trials. Black squares mark specimen analyzed using the dialysis/combustion method19; triangles mark samples analyzed using the persulfate/denitrifier method24. Error bars are one standard deviation from the mean. Z = zooxanthellate coral (modern), AZ = azooxanthellate coral (modern), Z-like = zooxanthellate-like coral (fossil), AZ-like = azooxanthellate-like coral (fossil). Holo. = Holocene, Mio. = Miocene, Olig. = Oligocene.
