Aspetti genetici ed ecologici dell'ibridazione naturale fra differenti specie diLeucosolenia(Calcispongie) a Roscoff

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Abstract
Each of the three species of Leucosolenia (L. complicata, L. variabilis and L. botryoides) of the Channel coasts and specially of Roscoff, live in different ecological niches, except in some places in which their distribution areas are superimposed. The A. describes in the places where different species are in contact a great hybridization process and the formation of several series of different phenotypes which are intermediate between their ancestors or similar to one of them. Outside these places, other populations, which often live in typical environments, are not similar to the typical polulations of their species and show, even in a less degree, some characters of another species. The A. shows the meaning of this polymorphism in the stabilizing and changing process and put on an interpretation on the origin of the different populations. The similarity of these findings with the aspects of introgressive hybridization studied by Anderson and others is shown.

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