Molecular Signatures of Selection on Reproductive Character Displacement of Flower Color In phlox Drummondii

Hopkins, Robin; Levin, Donald A.; Rausher, Mark D.

doi:10.1111/j.1558-5646.2011.01452.x

Cited by 53 publications

(77 citation statements)

References 106 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further, statistical inferences of evolutionary processes are prone to artefacts caused by other processes, such as changing population size 60,61 . Without experimental evidence of the functional or phenotypic impacts of mutations to corroborate such signatures, sequence-based statistical inferences remain thin and potentially misleading 32,62-64 .…”

Section: Why Evolutionary Biochemistry?mentioning

confidence: 99%

Evolutionary biochemistry: revealing the historical and physical causes of protein properties

2013

View full text Add to dashboard Cite

The repertoire of proteins and nucleic acids in the living world is determined by evolution; their properties are determined by the laws of physics and chemistry. Explanations of these two kinds of causality — the purviews of evolutionary biology and biochemistry, respectively — are typically pursued in isolation, but many fundamental questions fall squarely at the interface of fields. Here we articulate the paradigm of evolutionary biochemistry, which aims to dissect the physical mechanisms and evolutionary processes by which biological molecules diversified and to reveal how their physical architecture facilitates and constrains their evolution. We show how an integration of evolution with biochemistry moves us towards a more complete understanding of why biological molecules have the properties that they do.

show abstract

Section: Why Evolutionary Biochemistry?mentioning

confidence: 99%

Evolutionary biochemistry: revealing the historical and physical causes of protein properties

2013

View full text Add to dashboard Cite

show abstract

“…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%

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

Lemmon

Juenger

2017

Ecology and Evolution

View full text Add to dashboard Cite

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.

show abstract

“…More recently, restricted gene flow and drift were ruled out as being responsible for the character displacement, in a study showing that the gene responsible for one color component had been selected to differ in sympatry (Hopkins et al. 2012). In addition, results from field experiments ruled out the alternative possibility of the character displacement being caused by local adaptation to the physical environment, and again showed that color had a strong effect on pollinator movement and hybridization (Hopkins and Rausher 2012).…”

Section: Introductionmentioning

confidence: 99%

Differences in style length confer prezygotic isolation between two dioecious species ofSilenein sympatry

Nista

Brothers

Delph

2015

Ecology and Evolution

View full text Add to dashboard Cite

One fundamental signature of reinforcement is elevated prezygotic reproductive isolation between related species in sympatry relative to allopatry. However, this alone is inadequate evidence for reinforcement, as traits conferring reproductive isolation can occur as a by-product of other forces. We conducted crosses between Silene latifolia and S. diclinis, two closely related dioecious flowering plant species. Crosses with S. latifolia mothers from sympatry exhibited lower seed set than mothers from five allopatric populations when S. diclinis was the father. However, two other allopatric populations also exhibited low seed set. A significant interaction between style length and sire species revealed that seed set declined as style length increased when interspecific, but not intraspecific, fathers where used. Moreover, by varying the distance pollen tubes had to traverse, we found interspecific pollen placement close to the ovary resulted in seed set in both long- and short-styled S. latifolia mothers. Our results reveal that the long styles of S. latifolia in sympatry with S. diclinis contribute to the prevention of hybrid formation. We argue that forces other than reinforcing selection are likely to be responsible for the differences in style length seen in sympatry.

show abstract

Molecular Signatures of Selection on Reproductive Character Displacement of Flower Color In phlox Drummondii

Cited by 53 publications

References 106 publications

Evolutionary biochemistry: revealing the historical and physical causes of protein properties

Evolutionary biochemistry: revealing the historical and physical causes of protein properties

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

Differences in style length confer prezygotic isolation between two dioecious species ofSilenein sympatry

Contact Info

Product

Resources

About