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(a) Symbiont states in Astrangia poculata: With polyps contracted, fully aposymbiotic colonies appear white in color; fully symbiotic colonies appear brown in color. (b) [a] Aposymbiotic, [m] mottled, and [s] symbiotic colonies of A. poculata occur concurrently in the field. (c) Adjacent polyps in a mottled colony demonstrate [a] aposymbiotic and [s] symbiotic densities. Photographs by E.M. Burmester
