Figure 2
From: Rare symbionts may contribute to the resilience of coral–algal assemblages
(a) Co-occurrence of Symbiodinium OTUs in hard corals and other symbiotic anthozoans from the Arabian Seas form four significant clusters (P<0.01). Each symbol represents an OTU with respective sizes denoting relative abundance and colors (purple, pink, orange, black) denoting cluster membership; red connections between OTUs represent overlaps between the purple and pink clusters. Lines indicate co-occurrence of two OTUs in a sample, and increasing line thickness indicates a higher number of samples in which the OTUs co-occur. (b) The rank-abundance distribution of Symbiodinium OTUs in each co-occurrence cluster displays a structured assembly that is comprised of rare and abundant members. (c) Two co-occurrence clusters (blue and green) of Symbiodinium OTUs were detected when samples were grouped by host taxon, with an overlap of 11 OTUs (turquoise) shared between both clusters. (d) The two host taxon-based co-occurrence clusters were of comparable size and followed the power-law scaling behavior of rank abundance. Colors denote separate clusters, colors in (b) and (d) correspond to clusters in (a) and (c), respectively, gray=OTUs not part of a cluster (P >0.01).
