Reproductive Interference in Interspecific Interactions

Reproductive interference arises when sexual or courtship behaviours directed at one species disrupt the reproductive success of another, imposing fitness costs on one or both parties. It typically involves closely related taxa in sympatry or at secondary contact and can manifest through signal jamming, heterospecific courtship, erroneous copulation attempts or gametic interactions that reduce fertility or produce sterile hybrids. The intensity and outcome of interference often depend on relative abundance and encounter rates, leading to asymmetric effects that may drive local exclusion, stable coexistence or demographic shifts. Ecological context—such as habitat structure, temporal overlap and species-specific life histories—modulates the expression of interference, while evolutionary processes can reinforce pre-mating barriers or maintain polymorphisms in reproductive traits. Practical implications extend to pest management, invasive-species control and conservation of endangered taxa, where harnessing or mitigating reproductive interference offers novel strategies. Recent advances combine empirical studies across fishes, insects, flatworms and nematodes with theoretical models, illuminating how density-dependent and frequency-dependent mechanisms shape community dynamics and evolutionary trajectories in natural and managed ecosystems.

Research from Nature Portfolio

Studies have applied experimental and modelling approaches to clarify the dynamics of reproductive interference. In flatworms, morphological and behavioural divergence in two Macrostomum species revealed that despite clear stylet differences, heterospecific pairing occurs readily, generating fertile F₁ hybrids and asymmetrical costs driven by differences in mating rate. In live-bearing fish, laboratory and field investigations showed that introduced guppies disrupt reproduction in native mosquitofish through persistent courting, leading to population decline and suggesting a non-radiative biological control method. Complementing these findings, a generalised population-dynamics model introduced absolute density dependence of reproductive interference, demonstrating that encounter rate can overturn simple frequency-dependent predictions. Empirical tests using seed beetles confirmed that interference intensifies with total density, yielding novel conditions for coexistence and highlighting the importance of incorporating density effects into forecasts of species interactions.

Research from all publishers

A recent review of insect systems synthesised mechanisms of “satyrisation”—a form of reproductive interference—illustrating how heterospecific matings among pest species can be leveraged for biological control. This work surveys cases in Diptera and Lepidoptera, emphasising asymmetric fitness costs and proposing a framework for integrating satyrisation with conventional management tactics. A conceptual analysis in community ecology proposed a stability framework for species pairs, predicting that interference is most pronounced in secondary contact and that evolutionary history shapes the prevalence of costly interactions. Empirical support from a study of two sister bush-cricket species mapped a mosaic distribution at range margins and demonstrated low but significant heterospecific spermatophore transfer; the nutritional benefit of heterospecific nuptial gifts may paradoxically sustain interference and drive local exclusion of the rarer taxon, underscoring context-dependent outcomes.

Reproductive Interference in Interspecific Interactions publication trend

The graph below shows the total number of articles in reproductive interference in interspecific interactions across all publications each year (not limited to Nature Index journals).

Technical terms

Reproductive interference: Interspecific sexual interactions that reduce one or both species’ fitness.

Heterospecific mating: Copulation or courtship directed towards a member of another species.

Satyrisation: A form of reproductive interference in which one species’ males impair the reproduction of another, often applied in pest management.

Absolute density dependence: A scenario in which the strength of interference is determined by the total number of individuals rather than their relative frequencies.

Assortative mating: A tendency for individuals to preferentially mate with conspecifics, reducing heterospecific pairings.

References

1. Reproductive interference and Satyrisation: mechanisms, outcomes and potential use for insect control. Journal of Pest Science (2022).
2. Successful mating and hybridisation in two closely related flatworm species despite significant differences in reproductive morphology and behaviour. Scientific Reports (2020).
3. Reproductive interference in live-bearing fish: the male guppy is a potential biological agent for eradicating invasive mosquitofish. Scientific Reports (2019).
4. A generalized population dynamics model for reproductive interference with absolute density dependence. Scientific Reports (2017).
5. When does reproductive interference occur? Predictions and data. Population Ecology (2020).
6. The mosaic distribution pattern of two sister bush‐cricket species and the possible role of reproductive interference. Ecology and Evolution (2020).