Hybridization, Unisexuality, and Polyploidy in the Teleost Poeciliopsis (Poeciliidae) and Other Vertebrates

@article{Schultz1969HybridizationUA,
  title={Hybridization, Unisexuality, and Polyploidy in the Teleost Poeciliopsis (Poeciliidae) and Other Vertebrates},
  author={Robert J. Schultz},
  journal={The American Naturalist},
  year={1969},
  volume={103},
  pages={605 - 619},
  url={https://api.semanticscholar.org/CorpusID:84812427}
}
The discovery of this five-fish hybrid complex from the Rio Fuerte of northwestern Mexico suggests that hybridization, unisexuality, polyploidy, hybridogenesis, gynogenesis, and parthenogenesis are related, which makes it possible to explain how large changes in DNA levels took place during the evolution of vertebrates.
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431 Citations
Highly Influential Citations
20
Background Citations
144
Methods Citations
3
Results Citations
4

431 Citations

EVOLUTION OF A TRIHYBRID UNISEXUAL FISH (POECILIOPSIS, POECILIIDAE)

A diploid all-female fish of the genus Poeciliopsis (Poeciliidae) inhabits the Rio Fuerte of northwestern Mexico. From both morphological and biochemical studies, it is clear that this form,…

EGG‐PRODUCTION, POLYPLOIDIZATION AND EVOLUTION IN A DIPLOID ALL‐FEMALE FISH OF THE GENUS POECILIOPSIS

    M. Cimino
  • Biology
    Evolution; international journal of organic…
  • 1972
A unisexual-bisexual complex of viviparous fishes of the genus Poeciliopsis provides some interesting unisexual situations, among which are (1) present sympatry of the original progenitors of the complex; (2) two degrees of ploidy; and (3) two distinct mechanisms of unisexual reproduction, one of which is unique in vertebrates.

ECOLOGICAL AND EVOLUTIONARY RELATIONSHIPS AMONG DIPLOID AND TRIPLOID UNISEXUAL FISHES ASSOCIATED WITH THE BISEXUAL SPECIES, POECILIOPSIS LUCIDA (CYPRINODONTIFORMES: POECILIIDAE)

    Roger E. Thibault
  • Biology, Environmental Science
    Evolution; international journal of organic…
  • 1978
All-femaleness is perpetuated in Poecithe distribution and abundance levels of liopsis monacha-lucida by an unusual the two unisexuals within the Rio del meiotic mechanism known as hybridogenFuerte, and number of studies support the genome the distribution of the triploid unisexual dosage theory of unisexual constitution within the Fuerte river system.

Special Adaptive Problems Associated with Unisexual Fishes

The ability to produce two females for every one that bisexuals produce suggests that the unisexuals have the potential to win this competition; but in so doing, they would lose their sexual support and eliminate themselves.

EVOLUTION OF HISTOCOMPATIBILITY DIVERSITY IN AN ASEXUAL VERTEBRATE, POECILIOPSIS 2 MONACHA‐LUCIDA (PISCES: POECILIIDAE)

Poeciliopsis 2 monacha-lucida belongs to a complex of parthenogenetic all-female species that have evolved in mountain arroyos of the Sonoran Desert in Mexico, and their nomenclature reflects genome origin and dosage.

DISTRIBUTION, ADAPTATION AND PROBABLE ORIGIN OF AN ALL‐FEMALE FORM OF POECILIOPSIS (PISCES: POECILIIDAE) IN NORTHWESTERN MEXICO

Morphological and experimental evidence indicate that the common ancestor to all of the unisexual forms was a diploid unisexual that originated through hybridization, at which time it was endowed with its obligatory unisexuality and a disruptive meiotic mechanism.

Apomictic Reproduction in the Amazon Molly, Poecilia formosa, and Its Triploid Hybrids

The Amazon molly, Poecilia formosa, is the first vertebrate in which unisexuality was recognized and is thought to have arisen in nature as a hybrid of these species.

THE ECOLOGICAL RELATIONSHIP OF THE SALAMANDER AMBYSTOMA LATERALE TO ITS ALL‐FEMALE, GYNOGENETIC ASSOCIATE

    H. Wilbur
  • Biology, Environmental Science
    Evolution; international journal of organic…
  • 1971
The primary purpose of this study was to investigate the competitive interactions of diploid and triploid larvae as a factor in the maintenance of the Ambystoma jeffersonianum complex through ecological time.

Diploid Amazon mollies (Poecilia formosa) show a higher fitness than triploids in clonal competition experiments

It is suggested that triploids should have a selective advantage over diploids due to heterosis and/or gene redundancy based on the additional genetic material from the sexual host, but clonal competition experiments revealed a clear reproductive advantage of diploid competing with triploid results contradicts not only the hypothesis but also the stable co-existence ofdiploids and triploidal in natural habitats.

Genetics of cannibalism in a viviparous fish and its relationship to population density

The genetics of cannibalism and the significance of its density-dependent mechanism in teleosts of the genus Poeciliopsis, a five-membered unisexual–bisexual complex, is examined.
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29 References

Triploid Hybrids between the All-female Teleost Poecilia formosa and Poecilia sphenops

The Amazon molly, Poecilia formosa (Girard), is an all-female species native to southern Texas and north-eastern Mexico and in rare instances some offspring of P. formosa females exhibit paternal characters and thus are hybrids6,8,9.

REPRODUCTIVE MECHANISM OF UNISEXUAL AND BISEXUAL STRAINS OF THE VIVIPAROUS FISH POECILIOPSIS

From preserved material collected within the range of strain "F," Miller was able to identify females with two types of dentition, one of these is considered to be the normal type in that the minute inner teeth are like those of the male.

Weeds, Polyploids, Parthenogenesis, and the Geographical and Ecological Distribution of All-Female Species of Cnemidophorus

The habitats occupied by the various all-female species are diverse but have a common denominator, and the presence of such habitats at the time of origin of parthenogenetic individuals from hybridization between bisexual species looms as a critical factor for the survival of these species.

Taxonomic Problems in Parthenogenetic Vertebrates

The classical definition of a species used by most vertebrate systematists employs interbreeding as a primary criterion, but in several instances the inability of the uniparental form to breed with morplhologically similar and, hence, presumably related species has been used as a species criterion, even though crossbreeding between individuals of theunisexual species is impossible.

Gynogenesis and Triploidy in the Viviparous Fish Poeciliopsis

Three all-female strains of the viviparous fish Poeciliopsis occur in the R�o Fuerte of Sinaloa, Mexico and these monosexual forms are designated as Cx, Cy, and Cz.

Why Polyploidy is Rarer in Animals Than in Plants

The reason for the rare occurrence of polyploidy in animals, as compared with plants, is, in essence, very simple-animals usually have two sexes which are differentiated by means of a process involving the diploid mechanism of segregation and combination.

Gynogenesis in Salamanders Related to Ambystoma jeffersonianum

It is suggested that meiosis in triploid females is preceded by an endomitosis and the resulting sister chromosomes synapse to form pseudo-bivalents to result in genetic recombination.

All-Female Strains of the Teleost Fishes of the Genus Poeciliopsis

Two other species of poeciliids have recently been found to produce only female offspring, however, the young of these females, unlike those of M. formosa, inherit characteristics from any one of the several species of males used in experimental matings.

A CHROMOSOME STUDY ON BISEXUAL AND PARTHENOGENETIC RACES OF SCEPTICUS INSULARIS ROELOFS (CURCULIONIDAE, COLEOPTERA)

The chromosomes of a Japanese weevil species, Scepticus insularis Roelofs, collected from 10 localities, were investigated in germ cells and it was found that the bisexual and pentaploid races are apparently sexually isolated from each other.

DNA and the Evolution of the Vertebrates

The various tetrapod classes show varying degrees of reduction in DNA nuclear content, with the highest levels being retained by the more primitive amphibians and the lowest levels being found in the highly evolved birds.

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