Parapatric Hybridization between Chromosome Races of the Sceloporus grammicus Complex (Phrynosomatidae): Structure of the Tulancingo Transect

Sites, Jack W.; Davis, Scott K.; Hutchison, Delbert W.; Maurer, Bill; Lara, Guillermo

doi:10.2307/1447137

Cited by 14 publications

(23 citation statements)

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“…The genetic structures of additional hybrid zones to those described in Hall and Selander [1973] and Hall [1973] ( fig. 11 ) are reported by Arévalo et al [1993], Sites et al [1993Sites et al [ , 1995Sites et al [ , 1996, Reed and Sites [1995], Reed et al [1995a, b], Dosselman et al [1998], Marshall and Sites [2001], and Degnan and Aré-valo [2004]. The following tentative conclusions can be drawn from these data.…”

Section: Subsequent Studies Of the Grammicus Complexmentioning

confidence: 60%

“…Arévalo et al [1993] located narrow hybrid zones between HS and F6 and F6 and LS above Ajusco on the west side of the Valley of Mexico, but were unable to locate individuals in mid-contact areas or collect large enough samples for detailed analysis. Arévalo et al [1993], Sites et al [1993Sites et al [ , 1995Sites et al [ , 1996, and Marshall and Sites [2001] found the hybrid zone between F5 and FM2 near Tulancingo to be about 1 km wide, with strong deficits in heterozygotes and linkage disequilibria. Based on mark and recapture and genetic studies qualified by many caveats, they estimated average dispersal distances for juveniles and females to be less than 100 m with dispersals for males possibly to be somewhat more.…”

Section: Subsequent Studies Of the Grammicus Complexmentioning

confidence: 98%

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Chromosome Variation, Genomics, Speciation and Evolution in Sceloporus Lizards

Hall¹

2009

Cytogenet Genome Res

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The clade of the North American lizard genus Sceloporus and its relatives comprising the subfamily Phrynosomatinae (Iguanidae) includes perhaps 150 evolutionary lineages. The work reviewed here begins with the discovery of the concentration of Robertsonian chromosomal variability in Sceloporus more than 40 years ago and cytogenetic and genomic evidence of remarkable chromosomal variation within the S. grammicus complex associated with narrow zones of hybridization between different chromosomal races. These discoveries led to hypotheses about hybrid zones involving negative heterosis, possible modes of chromosomal speciation, and the potential roles of such speciation in phylogenesis. The radiation of Sceloporus has now been studied by many different workers extending and mapping the geographic distribution of cytogenetic and genomic variation to understand the biology of the chromosomal variation and to establish the phyletic relationships of the various lineages. The result is a robust phylogeny and a large and still growing database of genic, cytogenetic and other biological parameters. These materials provide a rich series of natural experiments to support both synthetic-comparative and analytical studies of the roles of chromosomal variation, hybrid zones and modes of speciation in phylogenesis and evolutionary success.

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Section: Subsequent Studies Of the Grammicus Complexmentioning

confidence: 60%

Section: Subsequent Studies Of the Grammicus Complexmentioning

confidence: 98%

Chromosome Variation, Genomics, Speciation and Evolution in Sceloporus Lizards

Hall¹

2009

Cytogenet Genome Res

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“…However, early studies of chromosomal pairing behavior during meiosis (in males) Sites, 1985, 1987] have provided indirect evidence of arm homology within and across different chromosome races of the S. grammicus complex (which range from 2n = 32 to 2n = 46) [summarized in Arévalo et al, 1991;Marshall et al, 2006]. These data have permitted the coding of chromosomal genotypes with some confidence for population cytogenetic studies [Porter and Sites, 1986;Aréva-lo et al, 1991], estimates of hybrid zone structure [Hall, 1973;Hall and Selander, 1973;Sites et al, 1993Sites et al, , 1995Arévalo et al, 1993;Marshall and Sites, 2001;Leaché and Cole, 2007], estimates of fitness correlates in hybrid zones Reed et al, 1995a, b;Sites et al, 1995], and phylogenetic studies [Wiens and Reeder, 1997;Flores-Villela et al, 2000] in the absence of high-resolution banding or fluorescent in situ hybridization studies.…”

Section: History Of Chromosome Researchmentioning

confidence: 99%

“…Linkage-dependent gene flow has been demonstrated across a European house mouse (Mus musculus) chromosomal hybrid zone, in which races are distinguished by Robertsonian rearrangements (centromeric fusion/fission mutations) [Panithanarak et al, 2004], and the same phenomenon might operate in the S. grammicus complex. The chromosome races are defined by Robert-sonian rearrangements, and one prediction of the 'recombination suppression' hypothesis is that genes linked to the centromeric region will reflect the same structure as the chromosomal differences that define the zone (i.e., very limited gene flow over very short differences) [Hall and Selander, 1973;Arévalo et al, 1993;Sites et al, 1993Sites et al, , 1995Marshall and Sites, 2001], while genes in the recombining regions should move freely across the zones. There is no genetic map for this or any other species of Sceloporus , so unlike Mus the genomic resources are not presently available to implement this kind of study, but the predictions are very clear about what should happen in these semi-permeable barriers to gene flow.…”

Section: Do Chromosomal Rearrangements Drive Speciation In Sceloporus?mentioning

confidence: 99%

Chromosome Evolution and Diversification in North American Spiny Lizards (Genus Sceloporus)

Leaché

Sites

2009

Cytogenet Genome Res

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The genus Sceloporus is a diverse clade of lizards that exhibits substantial variation in chromosome numbers and sex chromosome heteromorphisms, 2 features of the genome that are static among most other pleurodont iguanian lizards. Evolutionary changes to the fundamental number of chromosomes are hypothesized to be a primary factor responsible for driving the diversification of Sceloporus. We explore the patterns of chromosome evolution in Sceloporus using a combination of ancestral state estimations and species diversification tests. Phylogenetic relationships and divergence times within Sceloporus (53 species representing all 19 species groups) are estimated using 4 nuclear genes (>3.3 kb) and relaxed-clock analyses that incorporate a fossil calibration on the root of the tree. We test the hypothesis that chromosome evolution is correlated with shifts in species diversification using cross-validation predictive densities, a new Bayesian approach for modeling the number of species that are predicted to have evolved in the absence of a certain historical event (e.g., a change in chromosome numbers). Results of the cross-validation predictive densities approach indicate that chromosomal evolution is correlated with significantly higher species diversity than predicted under the background rate of diversification in Sceloporus. We conclude by discussing the future of comparative cytogenetic investigations in Sceloporus.

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“…In most habitats where they live these lizards are abundant and easy to collect, facilitating the widespread geographic sampling necessary to map distributions of chromosome races (Sites 1983;Porter and Sites 1986;Arévalo et al 1991). Detailed distributional studies have provided basic information on some zones of parapatric hybridization between different combinations of these races (Hall and Selander 1973;Arévalo et al 1993;Sites et al 1993), and one of these (Tulancingo transect) has been studied extensively (summarized in Marshall and Sites 2001).…”

Section: The Sceloporus Grammicus Complexmentioning

confidence: 99%

DELIMITING SPECIES: COMPARING METHODS FOR MENDELIAN CHARACTERS USING LIZARDS OF THE SCELOPORUS GRAMMICUS (SQUAMATA: PHRYNOSOMATIDAE) COMPLEX

et al. 2006

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Abstract. Species form the fundamental units of analysis in many areas of biology and, therefore, rigorous delimitation of this unit is important to a broad array of researchers. Recently, many new empirical methods have been proposed to delimit species in nature, and a large literature exists on the theoretical merit and superiority of each method. However, few empirical studies actually compare the results of these methods applied in the same study system. We used a large allozyme and chromosome dataset to apply a number of genetic-distance, character-based, and tree-based methods to a well-studied, data-rich system: the Sceloporus grammicus lizard complex of central Mexico. We hypothesized species boundaries under a general lineage or evolutionary species conceptual framework in an a priori fashion using mapped restriction-site data (mitochondrial DNA and nuclear rDNA), allozymes, and morphology. We then compared the ability of different methods to recover the ''hypothesized evolutionary species'' (HES). Highton's genetic-distance method and a tree-based method consistently recovered all four HES, although sometimes with weak support. With two exceptions, other methods recovered the same HES, but additional groups were weakly delimited and nested within the HES. Given the apparent recent divergence of some of the chromosome races and distinct populations in this complex, these are encouraging results. We emphasize the value of specifying testable criteria as clearly as possible and testing these with methods that make use of different properties of a single dataset.

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Parapatric Hybridization between Chromosome Races of the Sceloporus grammicus Complex (Phrynosomatidae): Structure of the Tulancingo Transect

Cited by 14 publications

References 0 publications

Chromosome Variation, Genomics, Speciation and Evolution in <i>Sceloporus</i> Lizards

Chromosome Variation, Genomics, Speciation and Evolution in <i>Sceloporus</i> Lizards

Chromosome Evolution and Diversification in North American Spiny Lizards (Genus <i>Sceloporus</i>)

DELIMITING SPECIES: COMPARING METHODS FOR MENDELIAN CHARACTERS USING LIZARDS OF THE SCELOPORUS GRAMMICUS (SQUAMATA: PHRYNOSOMATIDAE) COMPLEX

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