Hybridization and Geographic Variation in Two Meadow Katydid Contact Zones

Shapiro, Leo H.

doi:10.2307/2411272

Cited by 18 publications

(15 citation statements)

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“…Populations of P. decipiens in Texas and Florida potentially have been separated for approximately one million years. Patterns of phylogenetic structure for other plant and animal groups exhibit an east-west division along the Gulf Coast (Wiley and Mayden 1985;Shapiro 1998;Gill et al 1993;Gould and Jansen 1999;Burbrink et al 2000). Given this scenario, we expected that phylogenetic analyses would reveal a division in relatedness between haplotypes from Texas and the eastern United States populations, and the nested clade analysis would detect historical fragmentation for these populations.…”

Section: Background On Prodoxus Decipiensmentioning

confidence: 99%

Examining Genetic Structure in a Bogus Yucca Moth: A Sequential Approach to Phylogeography

Althoff

Pellmyr

2002

Evolution

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Abstract. Understanding the phylogeography of a species requires not only elucidating patterns of genetic structure among populations, but also identifying the possible evolutionary events creating that structure. The use of a single phylogeographic test or analysis, however, usually provides a picture of genetic structure without revealing the possible underlying evolutionary causes. We used current analytical techniques in a sequential approach to examine genetic structure and its underlying causes in the bogus yucca moth Prodoxus decipiens (Lepidoptera: Prodoxidae). Both historical biogeography and recent human transplantations of the moth's host plants provided a priori expectations of the pattern of genetic structure and its underlying causes. We evaluated these expectations by using a progression of phylogenetic, demographic, and population genetic analyses of mtDNA sequence data from 476 individuals distributed across 25 populations that encompassed the range of P. decipiens. The combination of these analyses revealed that much of the genetic structure has evolved more recently than suggested by historical biogeography, has been influenced by changes in demography, and can be best explained by long distance dispersal and isolation by distance. We suggest that performing a suite of analyses that focus on different temporal scales may be an effective approach to investigating the patterns and causes of genetic structure within species.Key words. Biogeography, isolation by distance, mismatch, nested clade, population structure, yucca moth.Received February 19, 2002. Accepted May 23, 2002 Avise (2000) defines phylogeography as ''. . . a field of study concerned with the principles and processes governing the geographic distributions of genealogical lineages' ' (p. 35). Phylogeography is the melding of biogeography and the evolutionary history of a lineage or groups of lineages. Early investigations used the methodology of phylogenetics to relate evolutionary history to the geographic distribution of populations within a lineage. The resulting phylogenetic tree of haplotypes was overlain on the current geographic structure of populations to make inferences about both historical and current patterns of population subdivision. This approach has and continues to work well for lineages that have been separated for long periods of time. In such lineages, the accumulation of genetic divergence translates into a phylogenetic signal that may correspond well with geographic separation.As an increasing number of studies have shown, the methodology of phylogenetics often lacks resolving power and may even obscure the evolutionary relationships of lineages that are relatively recent or have experienced demographic variation such as population bottlenecks or expansions (Crandall et al. 1994;Crandall and Templeton 1996;Smouse 1998). For these lineages the use of a bifurcating tree, whether parsimony or distance-based, may be misleading, especially when the ancestral haplotypes are extant. The use of haplotype networks will...

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Section: Background On Prodoxus Decipiensmentioning

confidence: 99%

Examining Genetic Structure in a Bogus Yucca Moth: A Sequential Approach to Phylogeography

Althoff

Pellmyr

2002

Evolution

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“…Potomac River, E. USA Survey after alien introduction 425 o100 L Mate preference Shapiro (1998Shapiro ( , 2000Shapiro ( , 2001, Cabrero et al (1999) Orconectes Patterns of molecular markers Patterns of molecular markers have been hypothesized to provide a signature of hybrid zone movement: a moving zone will leave in its wake a tail of clines of unlinked neutral markers, 'the hybrid zone will thus appear to be asymmetrical with apparent unidirectional introgression across the zone' (Moran, 1981, p 71). Recent modelling has shown that even limited hybridization between two taxa can result in substantial introgression, when one is competitively displacing the other (Currat and Excoffier, 2005).…”

Section: Relictual Populationsmentioning

confidence: 99%

Empirical study of hybrid zone movement

2007

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Hybrid zones are 'natural laboratories' for studying the origin, maintenance and demise of species. Theory predicts that hybrid zones can move in space and time, with significant consequences for both evolutionary and conservation biology, though such movement is often perceived as rare. Here, a review of empirical studies of moving hybrid zones in animals and plants shows 23 examples with observational evidence for movement, and a further 16 where patterns of introgression in molecular markers could be interpreted as signatures of movement. The strengths and weaknesses of methods used for detecting hybrid zone movement are discussed, including long-term replicated sampling, historical surveys, museum/ herbarium collections, patterns of relictual populations and introgression of genetic markers into an advancing taxon. Factors governing hybrid zone movement are assessed in the light of the empirical studies, including environmental selection, competition, asymmetric hybridization, dominance drive, hybrid fitness, human activity and climate change. Hybrid zone movement means that untested assumptions of stability in evolutionary studies on hybrid zone can lead to mistaken conclusions. Movement also means that conservation effort aimed at protecting against introgression could unwittingly favour an invading taxon. Moving hybrid zones are of wide interest as examples of evolution in action and possible indicators of environmental change. More long-term experimental studies are needed that incorporate reciprocal transplants, hybridization experiments and surveys of molecular markers and population densities on a range of scales.

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“…If the two common raven clades are randomly interbreeding and genes are intermixing completely across large areas of the western US, then this may be a striking example of geographical isolation and molecular di¡eren-tiation, followed by subsequent remixing of the two gene pools (also see Fleischer & Rothstein 1988;Quinn 1992;Shapiro 1998). The geographical distribution and phylogenetic patterns of ravens make them an excellent group for studying the process of speciation, or possibly the processes that allow separate populations to merge and not di¡erentiate as species.…”

Section: Cryptic Genetic Variation and Paraphyly In Ravens K E Omlamentioning

confidence: 99%

Cryptic genetic variation and paraphyly in ravens

Omland

Tarr

Boarman

et al. 2000

Proc. R. Soc. Lond. B

129

138

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Widespread species that are morphologically uniform may be likely to harbour cryptic genetic variation. Common ravens (Corvus corax) have an extensive range covering nearly the entire Northern Hemisphere, but show little discrete phenotypic variation. We obtained tissue samples from throughout much of this range and collected mitochondrial sequence and nuclear microsatellite data. Our study revealed a deep genetic break between ravens from the western United States and ravens from throughout the rest of the world. These two groups, the`California clade' and the`Holarctic clade' are well supported and over 4% divergent in mitochondrial coding sequence. Microsatellites also reveal signi¢cant di¡erentiation between these two groups. Ravens from Minnesota, Maine and Alaska are more similar to ravens from Asia and Europe than they are to ravens from California. The two clades come in contact over a huge area of the western United States, with mixtures of the two mitochondrial groups present in Washington, Idaho and California. In addition, the restricted range Chihuahuan raven (Corvus cryptoleucus) of the south-west United States and Mexico is genetically nested within the paraphyletic common raven. Our ¢ndings suggest that the common raven may have formerly consisted of two allopatric groups that may be in the process of remerging.

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Hybridization and Geographic Variation in Two Meadow Katydid Contact Zones

Cited by 18 publications

References 0 publications

Examining Genetic Structure in a Bogus Yucca Moth: A Sequential Approach to Phylogeography

Examining Genetic Structure in a Bogus Yucca Moth: A Sequential Approach to Phylogeography

Empirical study of hybrid zone movement

Cryptic genetic variation and paraphyly in ravens

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