Reproductive isolation among allopatric
            <i>Drosophila montana</i>
            populations

Jennings, Jackson H.; Snook, Rhonda R.; Hoikkala, Anneli

doi:10.1111/evo.12535

Cited by 44 publications

(120 citation statements)

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“…Other assays, including reproductive isolation experiments, were conducted when the flies were 18–22 days old, as normally done in D. montana (e.g., Jennings et al. ). Information on strain pairs used in studies on reproductive barriers is given in Table .…”

Section: Methodsmentioning

confidence: 99%

Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances

et al. 2019

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The impact of different reproductive barriers on species or population isolation may vary in different stages of speciation depending on evolutionary forces acting within species and through species’ interactions. Genetic incompatibilities between interacting species are expected to reinforce prezygotic barriers in sympatric populations and lead to cascade reinforcement between conspecific populations living within and outside the areas of sympatry. We tested these predictions and studied whether and how the strength and target of reinforcement between Drosophila montana and Drosophila flavomontana vary between sympatric populations with different histories and species abundances. All barriers between D. montana females and D. flavomontana males were nearly complete, while in the reciprocal cross strong postzygotic isolation was accompanied by prezygotic barriers whose strength varied according to population composition. Sexual isolation between D. flavomontana females and D. montana males was increased in long‐established sympatric populations, where D. flavomontana is abundant, while postmating prezygotic (PMPZ) barriers were stronger in populations where this species is a new invader and still rare and where female discrimination against heterospecific males was lower. Strengthening of sexual and PMPZ barriers in this cross also induced cascade reinforcement of respective barriers between D. flavomontana populations, which is a classic signature of reinforcement process.

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Section: Methodsmentioning

confidence: 99%

Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances

et al. 2019

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“…Some studies have examined the increase in barrier effects with geographic (e.g., Tilley et al 1990) or ecological (Nosil et al 2009) distance, or in preplanned comparisons that reflect population history (Tregenza et al 2000). Crosses between populations sometimes reveal unexpected and strong barrier effects (e.g., Jennings et al 2014). More surveys like these are needed, preferably measuring overall barriers and dissecting the component barrier effects.…”

Section: Evidencing Patterns Of Coincidencementioning

confidence: 99%

Coupling, Reinforcement, and Speciation

Butlin

Smadja

2018

The American Naturalist

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During the process of speciation, populations may diverge for traits and at their underlying loci that contribute barriers to gene flow. These barrier traits and barrier loci underlie individual barrier effects, by which we mean the contribution that a barrier locus or trait-or some combination of barrier loci or traits-makes to overall isolation. The evolution of strong reproductive isolation typically requires the origin of multiple barrier effects. Critically, it also requires the coincidence of barrier effects; for example, two barrier effects, one due to assortative mating and the other due to hybrid inviability, create a stronger overall barrier to gene flow if they coincide than if they distinguish independent pairs of populations. Here, we define "coupling" as any process that generates coincidence of barrier effects, resulting in a stronger overall barrier to gene flow. We argue that speciation research, both empirical and theoretical, needs to consider both the origin of barrier effects and the ways in which they are coupled. Coincidence of barrier effects can occur either as a by-product of selection on individual barrier effects or of population processes, or as an adaptive response to indirect selection. Adaptive coupling may be accompanied by further evolution that enhances individual barrier effects. Reinforcement, classically viewed as the evolution of prezygotic barriers to gene flow in response to costs of hybridization, is an example of this type of process. However, we argue for an extended view of reinforcement that includes coupling processes involving enhancement of any type of additional barrier effect as a result of an existing barrier. This view of coupling and reinforcement may help to guide development of both theoretical and empirical research on the process of speciation.

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“…PMPZ isolation is prevalent among members of this group, which includes D. americana , D. novamexicana , D. lummei , and D. virilis , and other barriers are less common (Sagga and Civetta 2011; Sweigart 2010b). PMPZ is also observed between allopatric populations of D. montana (Jennings et al 2014), an outgroup species that is a member of the larger virilis clade, highlighting the rapidity with which PMPZ can evolve. Indeed, in the most closely related pair of species ( D. americana and D. novamexicana , diverged ∼0.5 MYA), PMPZ isolation is the only reproductive barrier observed in the laboratory (Ahmed-Braimah and McAllister 2012).…”

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confidence: 92%

Multiple Genes Cause Postmating Prezygotic Reproductive Isolation in theDrosophila virilisGroup

Ahmed-Braimah

2016

G3 Genes|Genomes|Genetics

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Understanding the genetic basis of speciation is a central problem in evolutionary biology. Studies of reproductive isolation have provided several insights into the genetic causes of speciation, especially in taxa that lend themselves to detailed genetic scrutiny. Reproductive barriers have usually been divided into those that occur before zygote formation (prezygotic) and after (postzygotic), with the latter receiving a great deal of attention over several decades. Reproductive barriers that occur after mating but before zygote formation [postmating prezygotic (PMPZ)] are especially understudied at the genetic level. Here, I present a phenotypic and genetic analysis of a PMPZ reproductive barrier between two species of the Drosophila virilis group: D. americana and D. virilis. This species pair shows strong PMPZ isolation, especially when D. americana males mate with D. virilis females: ∼99% of eggs laid after these heterospecific copulations are not fertilized. Previous work has shown that the paternal loci contributing to this incompatibility reside on two chromosomes, one of which (chromosome 5) likely carries multiple factors. The other (chromosome 2) is fixed for a paracentric inversion that encompasses nearly half the chromosome. Here, I present two results. First, I show that PMPZ in this species cross is largely due to defective sperm storage in heterospecific copulations. Second, using advanced intercross and backcross mapping approaches, I identify genomic regions that carry genes capable of rescuing heterospecific fertilization. I conclude that paternal incompatibility between D. americana males and D. virilis females is underlain by four or more genes on chromosomes 2 and 5.

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Reproductive isolation among allopatric Drosophila montana populations

Cited by 44 publications

References 100 publications

Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances

Strength of sexual and postmating prezygotic barriers varies between sympatric populations with different histories and species abundances

Coupling, Reinforcement, and Speciation

Multiple Genes Cause Postmating Prezygotic Reproductive Isolation in theDrosophila virilisGroup

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