The settlement of Concholepas concholepas (Brugiere, 1789) (Gastropoda; Mu~icidae) was monitored in the intertidal zone in front of the Marine Reserve of Mehuin in Maiquillahue Bay. south-central Chile, from 1989 to 1997 Data appeared correlated to the SO1 [Southern Oscillation Index) and the occurrence of local upwelhng as detected from satellite images. Greatest settlement density was llnked to the coupling of upwelling between February and April, colnc~ding with the occurrence of the first stages of larval development (which hatch from benthic capsules as a late veliger stage). These conditions CO-occur when the mean value of the SO1 over the 3 mo prior to the beginning of the settlement period approximates zero.
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