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ASSORTATIVE POLLINATION FOR STATURE IN LYTHRUM SALICARIA

Several traits in animals, especially color and size, are known to induce some form of preference for mating between similar organisms (assortment) or between dissimilar organisms (disassortment). Assortative mating has been demonstrated in laboratory populations of Drosophila (Merrell, 1949; Rendel, 1944, 1951; Parsons, 1965) and natural populations of the BlueSnow Goose (Cooch and Beardmore, 1959; Cook and Cooch, 1968), Arctic Skua (O'Donald, 1959; Berry and Davis, 1970), and man (Spuhler, 1968). A tendency for disassortative mating has been observed in the moths Panaxia dominula (Kettlewell, 1942; Sheppard, 1952), Biston betularia (Kettlewell, 1956), and Amanthes glareosa (Kettlewell and Berry, 1961), and the white throated sparrow Zonotrichia albicollis (Lowther, 1961). Assortative pollination or mating in bior polymorphic populations of plants has not been reported. This void ostensibly is due to the lack of interest and observations in assortment by pollination biologists, rather than the absence of the practice. Assortative pollination for qualitative floral characters is a distinct possibility in zoophilous plants. It is well known that pollinators, especially bees, butterflies and hummingbirds, can discriminate between alternative floral signals such as color, scent and corolla configuration (cf., Faegri and van der Pijl, 1966). In addition, these pollinators often remain constant to a single food image in spite of the presence of alternative and suitable images which may be closely related species. If pollinators were to apply the same foraging tactics within a polymorphic population as they do in an as-