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Etude comparée de la croissance des Monodontes (Gastéropodes Prosobranches) en Manche et le long des côtes atlantiques et méditerranéennes françaises
Regis, M.-B. (1972). Etude comparée de la croissance des Monodontes (Gastéropodes Prosobranches) en Manche et le long des côtes atlantiques et méditerranéennes françaises, in: Battaglia, B. (Ed.) Fifth European Marine Biology Symposium. pp. 259-267
In: Battaglia, B. (Ed.) (1972). Fifth European Marine Biology Symposium. European Marine Biology Symposia, 5. Piccin Editore: Padova. 348 pp., more
In: European Marine Biology Symposia., more
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Document type: Conference paper
Keyword
    Marine/Coastal
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  • Regis, M.-B.
Abstract
    The comparative growth of the shell of Monodonta (Gastropoda Prosobranchia) is discussed for M. lineata from the Channel and the Atlantic coasts of France (Gaillard 1965) and for M. turbinata and M. turbiformis from the French Mediterranean coast (Regis 1969). The mean annual spiral growth has been established (12 size classes for the Mediterranean species and 8 size classes for M. lineata). The study of the shell growth shows: (1) a seasonal periodicity with a strong summer growth increase (with maximum in September, stronger in lower latitude) and slows down growth in winter (slower in higher latitude). (2) a correlation between growth and sexual cycle: all the species show an obvious increase of growth in spring followed some weeks later by a slowing down probably correlated with sexual development. The growth lasts 10 year in the Channel and 4 years on the Atlantic coast for M. lineata, 2 one half years for M. turbinata and 18 months for M. turbinata in the Mediterranean. There is a great difference in the growth rate of the 3 species. M. lineata lives longer and reaches a greater size than the 2 other species.
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