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Génétique des populations de Sphaeroma serratum (F.) 14. Étude des populations de l'île de Batz = Genetics of populations of Sphaeroma serratum 14. Study of the populations of the Isle of Batz
Lejuez, R. (1979). Génétique des populations de Sphaeroma serratum (F.) 14. Étude des populations de l'île de Batz = Genetics of populations of Sphaeroma serratum 14. Study of the populations of the Isle of Batz. Cah. Biol. Mar. 20(4): 431-448
In: Cahiers de Biologie Marine. Station Biologique de Roscoff: Paris. ISSN 0007-9723, more
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    Marine

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  • Lejuez, R.

Abstract
    During the summers of 1967 to 1972, the polychromatism of the natural populations of Sphaeroma serratum was studied on the coast of the Isle of Batz. Twenty-two representative samples, gathering 30,208 individuals, were collected along the 12 km long coast. The frequency of discretum , well represented, decreases gradually from west to east. Ornatum and lunulatum, which present an important correlation in the distribution, decrease from east to west and predominate on the south-east coast, well sheltered and warmer in summer. Signatum and 'red', scarcely represented and for which there is a correlation in the distribution of frequencies, are more numerous in the well sheltered south-south-east area.

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