The abundance and spatial distributions of Millepora complanata and Millepora squarrosa were determined from contiguous, m2 quadrats laid out along transects on three fringing reefs at Barbados, W.I. Spatial pattern of millepore colonies, determined by an analysis
of variance at increasing, hierarchical block sizes, indicated clumped or contagious distributions. It is concluded that the patchy distribution of M. complanata is due to stolonal growth of colony bases and to breakage and reattachment of colony branches. The patchy distribution of
M. squarrosa is more likely due to settlement preferences and differential survival of recruits. The life-history strategies of M. complanata which lead to contagious distributions would be advantageous in competition for space on coral reefs.
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