A Comparison of Populations of the Polymorphic Land Snail CEPAEA NEMORALIS (L.) Living in a Lowland District in France with Those in a Similar District in England.


AIN and SHEPPARD (1950, 1954) considered that natural selection, in particular visual selection exerted by predators, was an important agent influencing shell color and banding-morph frequencies in populations of Cepaea nemoralis in England. LAMOTTE ( 195 1 ) on the other hand, working with French populations, concluded that selection was of little… (More)


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