| reciprocal selection causes a coevolutionary arms race between crossbills and lodgepole pine. | few studies have shown both reciprocal selection and reciprocal adaptations for a coevolving system in the wild. the goal of our study was to determine whether the patterns of selection on rocky mountain lodgepole pine (pinus contorta spp. latifolia) and red crossbills (loxia curvirostra complex) were concordant with earlier published evidence of reciprocal adaptations in lodgepole pine and crossbills on isolated mountain ranges in the absence of red squirrels (tamiasciurus hudsonicus). we found ... | 2003 | 12858263 |