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Large and small scale distributions of the giant scallop Placopecten magellanicus were determined in 2 scallop beds near Port Daniel in the Baie des Chaleurs, eastern Canada. Large scale (km) distribution was strongly associated with substrates of gravel or gravel mixed with sand. Within each bed, small scale (cm) distribution was contagious corresponding to a negative binomial distribution. Morisita's index confirmed the contagious spatial distribution and showed that clump size was approximately 1.13 m2 in one bed and 4.50 m2 in the other. The majority of scallops in both beds rvere ~vithin clumps. Small scale aggregation was not related to substrdte type. Mature and immature scallops were significantly associated In the less densely populated bed but not in the more densely populated bed. This suggests that immature scallops moved nearer to adult scallops when densities were low Both sexes were present in 79 %of clumps of adult scallops. In both beds the sex ratio ~ 7 a s 1 : l and scallops did not appear to seek out members of the opposite sex. In the 2 beds 91 and 75 "i of nearest neighbor scallop pairs were 100 cm or closer to each other. The short distance between scallops within clumps, the high proportion of clumps with both sexes present, and an average of 3 scallops per clump suggest high fertilization success within clumps. We suggest that the small scale aggregation of scallops is a n adaptation to increase fertilization success, and if this is true, disturbance of these aggregations may decrease reproductive success.

Spatial distribution of the giant scallop Placopecten magellanicus in unharvested beds in the Baie des Chaleurs, Quebec