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oa African Zoology - Tidal activity rhythms in the mangrove snail Cerithidea decollata (Linn.) (Gastropoda: Prosobranchia: Cerithiidae)

Volume 16, Issue 1
  • ISSN : 1562-7020
  • E-ISSN: 2224-073X

 

Abstract

Activity rhythms in Cerifhidea decollata which migrates between the trees and the substrate in south-east African mangrove swamps were investigated in Durban Bay, South Africa. No light/dark rhythms were found. Activity followed a 14-day tidal rhythm. Maximum activity occurred over neap-tide periods and least over spring-tide periods when snails tended to remain on the trees over both high and low tides. Snails descended to the substrate more frequently in the upper intertidal area where inundation was less frequent and of shorter duration. Descent to the substrate appears to be associated with feeding. Tree-climbing is suggested to be a predator-avoidance mechanism.

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/content/afzoo/16/1/AJA00445096_1336
1981-01-01
2020-11-25

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