Frequency of female morphs is related to an index of male density in the damselfly, Nehalennia irene (Hagen)

Researchers have questioned whether variation in population density influences the maintenance of two or more morphs within and between insect populations. Two distinct morphs of female Nehalennia irene (Hagen) (Odonata: Coenagrionidae) occurred at each of eight sites in eastern Ontario, Canada; one morph (i.e. andromorph) was coloured and patterned like the conspecific male. We found significant differences in relative frequencies of …