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The resilience of reproductive interference
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The resilience of reproductive interference
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The resilience of reproductive interference
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Journal Article
The resilience of reproductive interference
2021
Overview
Mating with the wrong species is surprisingly common in nature. Interspecific mating can lead to reproductive interference, where wasted time, energy, nutrients, or gametes reduces the fitness of one or both of the interacting species. However, the ecological and evolutionary forces that maintain this seemingly maladaptive behavior remain poorly understood, in part because the natural complexity of heterospecific encounters is often not considered experimentally. The goal of this study was to directly test if the negative effects of heterospecific mating can be mitigated by conspecific mating. We used two closely related species of squash bug, Anasa tristis and Anasa andresii, which are known to readily mate with each other despite clear negative fitness consequences. We gave all females opportunities to mate with conspecific males before and after encountering heterospecific males. We found that A. tristis females can alleviate temporary bouts of heterospecific interference when given opportunities to mate with conspecifics. However, we found the opposite for A. andresii females. Mating with conspecifics did not shelter female A. andresii from the consequences of heterospecific mating. Our study reveals the complex dynamics of reproductive interference and highlights scenarios where mating with the wrong species can have either minimal or long-lasting effects on fitness. We emphasize the benefit of assessing reproductive interference using experiments that not only vary heterospecific encounter rates, but that also quantify lifetime measures of fitness. Our study adds to the growing body of research highlighting the importance of reproductive interference and sheds light on why this seemingly paradoxical behavior continues to persist.
