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Evolution of a patch of Zoothamnium niveum colony. The swarmers colonize a disturbed area (A). The settled colonies grow and start releasing new swarmers during a maturation phase (B). Finally, the colonies enter a senescent phase (C). Mature colonies are losing microzooids at the bottom part of the stalk, which starts to be overgrown by a variety of bacteria (Ott et al., 1998).
