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We studied natural selection in a hybrid zone of the intertidal marine snail Littorina saxatilis located in Galicia (NW Spain) by measuring the number and average size of the embryos carried by females. We related these characters with the females' position on the phenotypic and environmental gradients between the two pure morphs of the hybrid zone. In contrast with previous interpretations of studies...
Two different morphs of the intertidal snail Littorina saxatilis are found in the wave-exposed coasts of Galicia, NW Spain. One lives on the upper shore and the other on the lower shore. They meet and produce phenotypically intermediate hybrids in a narrow transition band on the mid-shore. To understand the maintenance in sympatry of such an extreme intraspecific polymorphism, we studied the change...
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