| the geographic selection mosaic for squirrels, crossbills and aleppo pine. | the interactions between many species are structured in a geographic mosaic of populations among which selection is divergent. here we tested the hypothesis that such a geographic selection mosaic arises for common crossbills (loxia curvirostra) feeding on seeds in the cones of aleppo pine (pinus halepensis) because of geographic variation in the occurrence of european red squirrels (sciurus vulgaris). on the iberian peninsula, sciurus exerted directional selection favouring larger cones with la ... | 2005 | 15715841 |