Relative Abundance and the Species-Specific Reinforcement of Male Mating Preference in the Chrysochus (Coleoptera: Chrysomelidae) Hybrid Zone

Peterson, M. J.; Honchak, Barbara M.; Locke, Stefanie E.; Beeman, Timothy E.; Mendoza, Jessica; Green, Jabin; Buckingham, Kati J.; White, Michael A.; Monsen, Kirsten J.

doi:10.1554/05-120.1

Cited by 13 publications

(30 citation statements)

References 72 publications

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“…If some habitats where hybridization occurs are more favorable to survival than others, we would detect apparent differences in rates that do not reflect the actual frequency of heterospecific mating. Third, relative densities or demographic histories of the interacting species may vary geographically, thereby affecting the opportunity for heterospecific mating (Howard, 1993; Noor, 1995; Nosil, Crespi, B. J., & Sandoval, C. P. 2003; Peterson et al., 2005; Servedio & Kirkpatrick, 1997; Servedio & Noor, 2003; Yukilevich, 2012). Chorus frog contact regions vary in spatial structure from shallow sympatry, where the two species co‐occur in roughly even frequencies (Alabama R1, Georgia R3–R5) to peninsular‐type sympatric distributions where gene flow from allopatry is restricted ( P. feriarum in Florida R2 and South Carolina R6), to island‐type sympatric distributions ( P. nigrita in Virginia R7–R9; Figure 1).…”

Section: Discussionmentioning

confidence: 99%

“…Further, Hoskin, Higgie, M., McDonald, K. R., & Moritz, C. (2005) and Peterson et al. (2005) found a link between asymmetric gene flow and asymmetric RCD in frogs and beetles, respectively—the females of species exhibiting higher levels of RCD hybridized rarely, if ever, compared to females from the other species. Collectively, this work and the present study suggest that asymmetry in the cost of hybridization causes the species bearing the greater cost to diverge in reproductive behaviors and subsequently hybridize less due to refinement of the female preference.…”

Section: Discussionmentioning

confidence: 99%

“…Thus in nature, the expectation is that observed hybridization rates should be moderate to low in reinforcement contact zones, which are secondary contact zones in which selection against hybridization is driving the evolution of prezygotic isolation between taxa. There is some support for this prediction from empirical data (Sætre et al., 1997; Sætre, Král, Bureš, & Ims, 1999; Nosil, Crespi, & Sandoval, 2003; Borge, Lindroos, Nádvorník, Syvänen, & Sætre, 2005; Hoskin, Higgie, McDonald, & Moritz, 2005; Peterson et al., 2005; Saether et al., 2007; Wiley, Qvarnström, Andersson, Borge, & Sætre, 2009; Matute, 2010; but see Hopkins, Levin, & Rausher, 2012). Another theoretical prediction relates to the directionality of gene flow in contact zones.…”

Section: Introductionmentioning

confidence: 99%

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Geographic variation in hybridization across a reinforcement contact zone of chorus frogs (Pseudacris)

Lemmon

Juenger

2017

Ecology and Evolution

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Reinforcement contact zones, which are secondary contact zones where species are diverging in reproductive behaviors due to selection against hybridization, represent natural laboratories for studying speciation‐in‐action. Here, we examined replicate localities across the entire reinforcement contact zone between North American chorus frogs Pseudacris feriarum and P. nigrita to investigate geographic variation in hybridization frequencies and to assess whether reinforcement may have contributed to increased genetic divergence within species. Previous work indicated these species have undergone reproductive character displacement (RCD) in male acoustic signals and female preferences due to reinforcement. We also examined acoustic signal variation across the contact zone to assess whether signal characteristics reliably predict hybrid index and to elucidate whether the degree of RCD predicts hybridization rate. Using microsatellites, mitochondrial sequences, and acoustic signal information from >1,000 individuals across >50 localities and ten sympatric focal regions, we demonstrate: (1) hybridization occurs and (2) varies substantially across the geographic range of the contact zone, (3) hybridization is asymmetric and in the direction predicted from observed patterns of asymmetric RCD, (4) in one species, genetic distance is higher between conspecific localities where one or both have been reinforced than between nonreinforced localities, after controlling for geographic distance, (5) acoustic signal characters strongly predict hybrid index, and (6) the degree of RCD does not strongly predict admixture levels. By showing that hybridization occurs in all sympatric localities, this study provides the fifth and final line of evidence that reproductive character displacement is due to reinforcement in the chorus frog contact zone. Furthermore, this work suggests that the dual action of cascade reinforcement and partial geographic isolation is promoting genetic diversification within one of the reinforced species.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geographic variation in hybridization across a reinforcement contact zone of chorus frogs (Pseudacris)

Lemmon

Juenger

2017

Ecology and Evolution

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“…obs.). Positive assortative mating between the two species, seen in both the field and the lab, is a result of sexual isolation (Peterson et al 2005b). The strength of sexual isolation is greatest in no-choice tests involving C. cobaltinus males, suggesting that males of this species may be more selective than are C. auratus males (Peterson et al 2005b).…”

Section: Introductionmentioning

confidence: 99%

“…Positive assortative mating between the two species, seen in both the field and the lab, is a result of sexual isolation (Peterson et al 2005b). The strength of sexual isolation is greatest in no-choice tests involving C. cobaltinus males, suggesting that males of this species may be more selective than are C. auratus males (Peterson et al 2005b). It has been argued that since Chrysochus hybrids have extremely low fitness (Peterson et al 2005a), selection should reinforce the evolution of sexual isolation in the hybrid zone (Howard 1993;Servedio and Noor 2003).…”

Section: Introductionmentioning

confidence: 99%

Profiles of cuticular hydrocarbons mediate male mate choice and sexual isolation between hybridising Chrysochus (Coleoptera: Chrysomelidae)

et al. 2007

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Chemical signals frequently underlie sexual isolation between insect species. Our understanding of the evolutionary forces influencing these signaling systems is known for very few systems, challenging both our efforts to understand insect speciation, and our ability to predict longterm changes in the chemical communication systems of insects. Thus, we are in need of more systems in which both the chemical signals causing sexual isolation and the evolutionary forces driving sexual isolation are understood. Sexual isolation in the hybrid zone between Chrysochus cobaltinus and C. auratus has apparently increased in response to natural selection against hybridisation (i.e. reinforcement). Previous experiments suggested that this isolation was due, at least in part, to male preferences for conspecific females. Here, we confirm this role of male choice, and document that male mate choice in this system is influenced by cuticular hydrocarbon (CHC) profiles. Specifically, male C. cobaltinus responses to control cadavers and conspecific female cadavers painted with different cuticular hexane extracts, together with analyses of the composition of those extracts, revealed that male mate choice is governed by CHC profiles. Multivariate analyses of GC profiles demonstrated that those profiles are indeed both sex-and species-specific. Although GC-MS enabled identification and quantification of the specific cuticular hydrocarbons, we have not yet determined which individual compounds govern mate choice. Having established that CHCs influence sexual isolation in this system, we can now assess the evolutionary lability of these cues, which will inform both our understanding of speciation, and of the conditions under which the chemical signaling systems that influence mate choice in insects can evolve.

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Reinforcement and learning

2007

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Evidence has been accumulating to support the process of reinforcement as a potential mechanism in speciation. In many species, mate choice decisions are influenced by cultural factors, including learned mating preferences (sexual imprinting) or learned mate attraction signals (e.g., bird song). It has been postulated that learning can have a strong impact on the likelihood of speciation and perhaps on the process of reinforcement, but no models have explicitly considered learning in a reinforcement context. We review the evidence that suggests that learning may be involved in speciation and reinforcement, and present a model of reinforcement via learned preferences. We show that not only can reinforcement occur when preferences are learned by imprinting, but that such preferences can maintain species differences easily in comparison with both autosomal and sex-linked genetically inherited preferences. We highlight the need for more explicit study of the connection between the behavioral process of learning and the evolutionary process of reinforcement in natural systems.

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Relative Abundance and the Species-Specific Reinforcement of Male Mating Preference in the Chrysochus (Coleoptera: Chrysomelidae) Hybrid Zone

Cited by 13 publications

References 72 publications

Geographic variation in hybridization across a reinforcement contact zone of chorus frogs (Pseudacris)

Geographic variation in hybridization across a reinforcement contact zone of chorus frogs (Pseudacris)

Profiles of cuticular hydrocarbons mediate male mate choice and sexual isolation between hybridising Chrysochus (Coleoptera: Chrysomelidae)

Reinforcement and learning

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