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Evidence of gregarious settlement in the larvae of the marine snail collisella strigatella

Veliger 24(2): 181-184

Evidence of gregarious settlement in the larvae of the marine snail collisella strigatella

Within boulder fields in southern California [USA] the density of small, recently settled limpets, C. strigatella, on boulders isolated in sand is positively correlated with that of older individuals. Since the sand prevents migration, this pattern must result from events taking place at the time of settlement or shortly thereafter. The results of a field experiment suggest that the pattern may be partly the result of gregarious settlement. Large limpets were confined in fenced plots in 3 spp. combinations: 10 C. strigatella alone; 5 C. strigatella with 5 Notoacmea fenestrata; and 10 N. fenestrata alone. After a settlement episode the number of recently settled C. strigatella in each plot was calculated. Newly settled C. strigatella occurred in greater numbers in those fenced plots which contained adults of the same species than in plots which contained only adults of the related species, N. fenestrata.

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Accession: 005411443

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