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Effect Of Simulated Tidal Patterns On Growth And Growth Line Formation In The Little Neck Clam, Protothaca Staminea, Orlando Irsula
Effect Of Simulated Tidal Patterns On Growth And Growth Line Formation In The Little Neck Clam, Protothaca Staminea, Orlando Irsula
Loma Linda University Electronic Theses, Dissertations & Projects
Growth lines in bivalve mollusks have been thought to reflect solar days, circadian rhythms and/or tides. Tides seem to be the dominating influence in some intertidal species. This study provides laboratory evidence suggesting that tides are a major influence in the number of growth lines in the clam Protothaca staminea.
Clams were grown under 4 different "tidal" regimes, (0, 1, 2 and 3 tides per day) for forty-one days. Acetate peels of shell cross sections were used for growth line counting. Photomicrographs and measurements showed a striking difference in the growth and number of growth lines between the 4 tidal …