Abstracts (first author)
Assortative mating strength and selection of morphological characters in natural populations of two closely related damselfly speciesPDF
Assortative mating occurs when individuals in a population mate non-randomly and there is a correlation with respect to traits between individuals in mated pairs. It is important in evolutionary processes in that if selection acts on the same trait, assortative mating may lead to speciation and reproductive isolation. On the other hand, if assortative mating is free of selection, it will lead to stabilizing selection within a population. In this study, I examined assortative mating strength within and between two sympatric damselfly species (Calopteryx splendens and Calopteryx virgo) by correlating the male and female morphological characters in mated pairs. In addition, I investigated the relationship between assortative mating and sexual selection (linear, β and quadratic, γ) on the same traits for these damselfly species. In both species, positive assortative mating was more common than negative assortment (disassortative mating). Thorax width in both species had the greatest assortative mating strength. There was no relationship between assortative mating strength and linear selection or quadratic selection. This indicates that there is no strong connection between assortative mating and sexual selection on the same traits. Assortative mating strength for C. splendens and C. virgo were concordant, and positive, suggesting that there is no noticeable reproductive isolation between these two species and that stabilizing selection is probably operating. Rather, assortment in both species is based on quality, where high-quality males get high-quality females. This study contributes to the knowledge about evolution and selection in natural populations.