Interspecific interactions and premating reproductive isolation
Interspecific interactions and premating reproductive isolation
Two species can interact in several ways: there may occur interspecific competition or aggression, the two species may hybridize or they may interact indirectly through different predator-prey interactions. One consequence of these interactions is the evolution of premating reproductive isolation between the two species. For example, there may be divergent selection on male secondary sexual characters, which results in enhancement of premating reproductive isolation of two closely related species. This chapter focuses on two questions: firstly, how do interspecific hybridization, aggression and predation, affect premating reproductive isolation? Secondly, is reproductive isolation a direct target of selection or does it evolve as a correlated response to selection on other traits? This chapter uses Calopteryx damselflies as model organisms in this discussion, which have been under intensive study concerning these topics.
Keywords: Calopteryx, hybridization, interspecific aggression, interspecific competition, natural selection, predation, secondary sexual characters
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