Natural Hybridization Between the Teiid Lizards Cnemidophorus sonorae (Parthenogenetic) and Cnemidophorus tigris (Bisexual)

Lowe, Charles J.; Wright, John W.; Cole, Charles J.; Bezy, Robert L.

doi:10.2307/2412449

Cited by 47 publications

(18 citation statements)

References 5 publications

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“…Contra the idea that the main source of chromosomic evolution in Aspidoscelis has been Robertsonian centric fusion, the karyotype of A. rodecki seems to be the result of Todd´s fission. This kind of fission, which seems to be the main mechanism of chromosomal evolution within unisexual Aspidoscelis (Fritts 1969, Lowe et al 1970a, b, Cole 1979, Manríquez-Morán et al 2000, also has been observed in several other gonochoristic species. It is responsible of chromosomal diversity in some groups of reptiles (Liolaemus, colubrid snakes), mammals (Canidae, Artiodactyla, Old World monkeys) and several invertebrates (Kolnicki 2000).…”

Section: Discussionsupporting

confidence: 54%

Origem e diversidade clonal do lagarto partenogenético Aspidoscelis rodecki (Squamata: Teiidae): evidências cromossômicas.

Manríquez–Morán¹,

Cruz²

2012

Phyllomedusa

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Origin and clonal diversity of the parthenogenetic lizard Aspidoscelis rodecki (Squamata: Teiidae): chromosomal evidence. We analyzed the karyotypes of individuals of two different populations of Aspidoscelis rodecki to investigate the origin and chromosomal diversity of this unisexual lizard. The karyotype of A. rodecki has a diploid number of 50 chromosomes, and exhibits a marked structural heteromorphism. The unique arrangement seems to have originated by Todd´s fission after the origin of parthenogenesis (hybridization between A. angusticeps and A. deppii). This pattern was observed in two populations of the species, which is endemic to the Yucatan Peninsula.Keywords: chromosome fission, karyotype, parthenogenesis. ResumenOrigen y diversidad clonal de la lagartija partenogenética Aspidoscelis rodecki (Squamata: Teiidae): evidencia cromosómica. Con el fin de conocer el origen y la diversidad cromosómica de Aspidoscelis rodecki, analizamos el cariotipo de individuos de dos poblaciones de esta lagartija unisexual. El cariotipo de A. rodecki presenta un número diploide de 50 cromosomas y muestra un marcado heteromorfismo estructural. El arreglo cromosómico parece haberse originado a través de fisiones de Todd, posteriores al origen de la partenogénesis (hibridación entre A. angusticeps y A. deppii). Este patrón fue observado en dos poblaciones de la especie, que es endémica de la Península de Yucatán.

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Section: Discussionsupporting

confidence: 54%

Origem e diversidade clonal do lagarto partenogenético Aspidoscelis rodecki (Squamata: Teiidae): evidências cromossômicas.

Manríquez–Morán¹,

Cruz²

2012

Phyllomedusa

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“…When hybridization occurs between a diploid parthenogenetic female and a sexual male, the hybrid offspring are triploid (e.g., ref. 23); whereas hybridization events involving triploid parthenogenetic females produce tetraploid hybrids (24)(25)(26)(27). Notably, in no case has successful reproduction of a hybrid been documented; and with one exception (24) the animals were clearly infertile where examined (e.g., ref.…”

mentioning

confidence: 99%

Laboratory synthesis of an independently reproducing vertebrate species

Lutes

Baumann

Neaves

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Speciation in animals commonly involves an extrinsic barrier to genetic exchange followed by the accumulation of sufficient genetic variation to impede subsequent productive interbreeding. All-female species of whiptail lizards, which originated by interspecific hybridization between sexual progenitors, are an exception to this rule. Here, the arising species instantaneously acquires a novel genotype combining distinctive alleles from two different species, and reproduction by parthenogenesis constitutes an effective intrinsic barrier to genetic exchange. Fertilization of diploid parthenogenetic females by males of sexual species has produced several triploid species, but these instantaneous speciation events have neither been observed in nature nor have they been reconstituted in the laboratory. Here we report the generation of four self-sustaining clonal lineages of a tetraploid species resulting from fertilization of triploid oocytes from a parthenogenetic Aspidoscelis exsanguis with haploid sperm from Aspidoscelis inornata. Molecular and cytological analysis confirmed the genetic identity of the hybrids and revealed that the females retain the capability of parthenogenetic reproduction characteristic of their triploid mothers. The tetraploid females have established self-perpetuating clonal lineages which are now in the third generation. Our results confirm the hypothesis that secondary hybridization events can lead to asexual lineages of increased ploidy when favorable combinations of parental genomes are assembled. We anticipate that these animals will be a critical tool in understanding the mechanisms underlying the origin and subsequent evolution of asexual amniotes.hybrid speciation | polyploidy | Cnemidophorus | unisexual

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“…Furthermore, naturally occurring hybrids of several sexual and parthenogenetic Cnemidophorus species have been reported (12,(14)(15)(16) …”

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confidence: 99%

“Sexual” behavior in parthenogenetic lizards ( Cnemidophorus )

Crews

Fitzgerald

1980

Proc. Natl. Acad. Sci. U.S.A.

102

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'All-female, parthenogenetic species afford a unique test of hypotheses regarding the nature and evolution of sexuality. Basic data on the behavior of parthenogens are lacking, however. We have discovered, from observations of captive Cnemidophorus uniparens, C. velox, and C. tesselatus, behavior patterns remarkably similar to the courtship and copulatory behavior of closely related sexual species. Briefly, in separately housed pairs, one lizard was repeatedly seen to mount and ride its cagemate and appose the cloacal regions. Dissection or palpation revealed that, in each instance, the courted animal was reproductively active, having ovaries containing large, preovulatory follicles, while the courting animal was either reproductively inactive or postovulatory, having ovaries containing only small, undeveloped follicles. These observations are significant for the questions they raise. For example, is this behavior a nonfunctional vestige of the species' ancestry, or is this behavior necessary for successful reproduction in the species (e.g., by priming reproductive neuroendocrine mechanisms as has been demonstrated in sexual species)?All-female, parthenogenetic species present a unique opportunity to test hypotheses regarding the nature and evolution of sexuality. Whereas the majority of vertebrates are gonochoristic (i.e., separation of the sexes in different individuals), at least 27 species of reptiles are known to consist mostly or entirely of females and to reproduce only clones of female offspring (1). The most thoroughly studied lizard parthenogens belong to the genera Cnemidophorus and Lacerta, and much is now known concerning the cytogenetics and ecology of several species (2, 3). Little information, however, is available regarding the behavior of these animals (4, 5). Such information would provide valuable insight into the role of behavior in the neuroendocrine control of reproductive processes in parthenogenetic species. Presented here are observations of captive parthenogenetic lizards exhibiting behavior patterns remarkably similar to the courtship and copulatory behavior of sexual congenerics.

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Natural Hybridization Between the Teiid Lizards Cnemidophorus sonorae (Parthenogenetic) and Cnemidophorus tigris (Bisexual)

Cited by 47 publications

References 5 publications

Origem e diversidade clonal do lagarto partenogenético Aspidoscelis rodecki (Squamata: Teiidae): evidências cromossômicas.

Origem e diversidade clonal do lagarto partenogenético Aspidoscelis rodecki (Squamata: Teiidae): evidências cromossômicas.

Laboratory synthesis of an independently reproducing vertebrate species

“Sexual” behavior in parthenogenetic lizards ( Cnemidophorus )

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