Adaptive potential for the invasion of novel host plants in the bean weevil: patterns of the reproductive behavior in populations that used different host plants
Milanovic, D., Institut za bioloska istrazivanja Sinisa Stankovic, Beograd (Serbia) | Gliksman, I., Institut za bioloska istrazivanja Sinisa Stankovic, Beograd (Serbia) | Aleksic, I., Institut za bioloska istrazivanja Sinisa Stankovic, Beograd (Serbia)
The goal of this work was to examine interpopulation patterns in the reproductive behaviour of populations of bean weevil (Acanthoscelides obtectus Say; Coleoptera: Bruchidae) that had different levels of specialization on their native host plant - the bean (Phaseolus vulgaris L.), as well as on a novel host plant - the chickpea (Cicer arietinum Thorn). The obtained pattern of interpopulation mating behaviour seemed exactly as if the males on chickpea had evolved a specific odor and/or a courtship ritual that females of populations on bean found repulsive. Unlike females, the males of bean populations seemed to be willing to mate with females from the population on chickpea equally as with their own females. Such an asymmetric pattern of reproductive isolation between populations of a species has been often considered an initial phase of a process of speciation. Thus, our results could be a good starting point for further, thorough examination of both the role of the level of host specialization in females and the role of biochemical characteristics of male pheromone (and/or thier cuticular hydrocarbons) in the evolution of pre-reproductive isolation between insect populations. As the results of this study, together those of previous studies on A. obtecus, suggest great evolutionary potential for invansions of and fast specialization on novel host plants, they could provide valuable information for the development of long-term strategies under the programmes of integrated pest management.
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