A tangled web: comparing inter- and intraspecific mating dynamics in Anasa squash bugs

Reproductive interference, reproductive interactions between heterospecific individuals including mating, is commonly reported across taxa but its drivers are still unclear. Studying heterospecific matings in the context of their conspecific mating system— by relating an individual’s conspecific mating behavior to its heterospecific interactions— offers a powerful approach to address this uncertainty. Here we compare inter- and intraspecific mating dynamics in the squash bug Anasa tristis and its close relative Anasa andresii under semi-natural conditions. Using replicated enclosures, we surveyed the mating behavior of individually marked A. tristis and A. andresii bugs (5 males and 5 females of each species per trial) at hourly intervals using a robotic camera system over a 14-day period. We uncovered high levels of reproductive interference (19% of individuals engaged in heterospecific matings) but the majority of mating activity took place between conspecifics. A. tristis females whi...