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Tidal micro-growth bands in intertidal gastropod shells, with an evaluation of band-dating techniques

Four methods were used in dating micro-growth bands in the intertidal gastropods Littorina littorea, Patella vulgata and Nucella lapillus. One of the methods employed, immersion in 2.25 x 10-4 M acetazolamide, was always successful in producing a stress band by inhibiting shell growth, but in Littorina littorea and Nucella lapillus the inhibition persisted for several days after treatment and reduced the number of bands subsequently laid down. A surface check mark associated with an internal stress band could be made in a percentage of all three species if they were kept at 3°C for 3–4 days. However, this treatment was damaging to Nucella lapillus. The most reliable method for dating the bands without appreciably interrupting subsequent shell deposition was to remove mechanically a thin layer from the outer lip of the shell or to keep the animals in sea water with ample food for 36 h to produce an abnormally wide shell increment. When the last two methods were used and the number of bands from the check band to the growing edge were counted in peels of sectioned and etched shells, the number agreed within 1% with the number of low waters that the animals had experienced.