(RBL) ...population samples...taken from 76 localities, mostly in the SW England". "...the only character on which wave-exposure has any apparent effect is the abundance of yellow coloration in the shells. All other characters...were found to be correlated either directly or indirectly w. the nature of the diet..." "Increase of Mytilus in the diet tends to produce a fatter shell w. a more open spiral, and hence a wider aperture. Both of these influence the weight of the shell, but as the act in opposite directions they tend to cancel out...". "Increase of Mytilus in the diet also decreased the proportion of mature ("thick" type) shells...". "...the 2 colour types brown-black and mauve-pink, whose pigments are derived directly from the Mytilus, are closely correlated...w. the proportion of Mytilus in the diet...". "Two characteristics seem to be frequent in shells from a sub-littoral habitat, the variety imbricata, and a tendency to gigantism".
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