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Assessing Differences in Sperm Competitive Ability in Drosophila
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A tangled web: Comparing inter- and intraspecific mating dynamics in Anasa squash bugs.

E V Ginny Greenway1, Jennifer A Hamel2, Christine W Miller1

  • 1Entomology and Nematology Department, University of Florida, Gainesville, Florida, USA.

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Summary

Reproductive interference occurred frequently between two squash bug species, with 19% of individuals mating interspecifically. However, this reproductive interference did not significantly impact hatching success for Anasa tristis females.

Keywords:
mate choicemating systemspolyandryreproductive interference

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Area of Science:

  • Ecology
  • Evolutionary Biology
  • Behavioral Ecology

Background:

  • Reproductive interference, involving interactions between different species, is common but its causes remain unclear.
  • Investigating interspecific mating within the context of conspecific mating systems helps understand these drivers.

Purpose of the Study:

  • To compare inter- and intraspecific mating dynamics in squash bugs Anasa tristis and Anasa andresii.
  • To determine the drivers of reproductive interference in these closely related species.

Main Methods:

  • Utilized replicated enclosures with individually marked Anasa tristis and Anasa andresii (5 males, 5 females each).
  • Employed a robotic camera system for hourly mating behavior surveys over 14 days under semi-natural conditions.

Main Results:

  • Observed high levels of reproductive interference, with 19% of individuals engaging in interspecific matings.
  • The majority of mating activity remained intraspecific.
  • Anasa tristis females involved in interspecific matings showed hatching success comparable to those mating conspecifically.

Conclusions:

  • Reproductive interference can arise as a byproduct of limited intraspecific mate choice.
  • Limited fitness penalties for interspecific mating may contribute to its prevalence in this system.