Parthenogenesis in Komodo dragons

  title={Parthenogenesis in Komodo dragons},
  author={Phillip C. Watts and Kevin R. Buley and Stephanie Sanderson and Wayne S.J. Boardman and Claudio Ciofi and Richard Gibson},
Parthenogenesis, the production of offspring without fertilization by a male, is rare in vertebrate species, which usually reproduce after fusion of male and female gametes. Here we use genetic fingerprinting to identify parthenogenetic offspring produced by two female Komodo dragons (Varanus komodoensis) that had been kept at separate institutions and isolated from males; one of these females subsequently produced additional offspring sexually. This reproductive plasticity indicates that… Expand
Allelic inheritance in naturally occurring parthenogenetic offspring of the gonochoric sea star Patiria miniata
The finding of many cases in which some mature eggs spawned by females formed cleavage-stage embryos and feeding bipinnaria larvae without fertilization by sperm may suggest a shared propensity for asexuality among asterinid species from several clades in which isolated adults can produce offspring without outcrossing. Expand
Evidence for viable, non-clonal but fatherless Boa constrictors
Through microsatellite DNA fingerprinting, this work provides the first evidence of facultative parthenogenesis in a Boa constrictor, identifying multiple, viable, non-experimentally induced females for the first time in any vertebrate lineage. Expand
Shark virgin birth produces multiple, viable offspring.
This work presents a genetically verified case of automictic parthenogenesis by a white-spotted bamboo shark (Chiloscyllium plagiosum), in which at least 2 parthenogens were produced and survived for 5 years or more. Expand
Cryptic asexual reproduction in Caenorhabditis nematodes
It is discovered that the females of a predominantly sexual nematode species can reproduce asexually at a low frequency, and it is hypothesize that the low-frequency asexual reproduction in this species represents a transitional state between sexual and a sexual reproduction, and may serve as a model to understand the barriers to the evolution of asexuality. Expand
Facultative Parthenogenesis in Vertebrates: Reproductive Error or Chance?
The current knowledge about facultative parthenogenesis in the different vertebrate groups is summarized, mechanisms of diploid oocyte formation are introduced and the genetic consequences and potential evolutionary impact of facultative Parthenogenetic development in vertebrates are discussed. Expand
Parthenogenesis in a whitetip reef shark Triaenodon obesus involves a reduction in ploidy.
Data suggest that the pup of a female whitetip reef shark Triaenodon obesus was genetically haploid, developing directly from an unfertilized egg; as far as is known, this is the first observation of a spontaneously produced haploid vertebrate. Expand
Parthenogenesis in a captive Asian water dragon (Physignathus cocincinus) identified with novel microsatellites
It is determined that an isolated, captive female Asian water dragon produced at least nine offspring via parthenogenesis, the first documented case of parthenesis in the Squamate family Agamidae. Expand
Varanid Interest Group Observations on Parthenogenesis in Monitor Lizards
In this article I report observations on multiple parthenogenetic events in the Argus monitor (Varanus panoptes) in captivity. Two individually-housed females produced a total of 14 clutches of eggsExpand
Automictic Reproduction in Interspecific Hybrids of Poeciliid Fish
The mechanism described here can explain facultative parthenogenesis, as well as varying ploidy levels reported in different animal groups, and at least some of the reported cases of triploidy in humans can now be traced back to automixis. Expand
Virgin birth in a hammerhead shark
This work provides the first genetic evidence for chondrichthyan parthenogenesis, involving a hammerhead shark (Sphyrna tiburo), and broadens the known occurrence of a specific type of asexual development (automictic parthenesis) among vertebrates. Expand


Molecular genetic evidence for parthenogenesis in the Burmese python, Python molurus bivittatus
It is concluded that the meiotic pathways that produce the diploid egg cells are different, and the offspring are genetically identical to their mother, whereas in previous studies on sporadic parthenogenesis in snakes a loss of genetic information was reported. Expand
Molecular Clones within Organismal Clones
Some vertebrate “species”* exist predominantly or exclusively as females, exhibiting asexual or semisexual reproduction, and these all-female biotypes reproduce without genetic recombination via interspecific hybridization. Expand
A parthenogenetic Varanus
It is shown that the parthenogen and its mother exhibit almost identical DNA patterns, and an additional recombination could result homogamety (would explain the sex of theparthenogen) while expressing almost all maternal bands. Expand
Inbreeding and extinction in a butterfly metapopulation
The effect of inbreeding on local extinction in a large metapopulation of the Glanville fritillary butterfly is studied and it is found that extinction risk increased significantly with decreasing heterozygosity, an indication of inmarriage. Expand
Distribution and conservation of the Komodo monitor (Varanus komodoensis)
Habitat fragmentation and poaching of prey species currently represent the main threats to the Komodo monitor, and protection of monsoon forest in west and north Flores is crucial for the long-term conservation of the species. Expand
Most species are not driven to extinction before genetic factors impact them.
Differences in heterozygosity indicate lowered evolutionary potential, compromised reproductive fitness, and elevated extinction risk in the wild in threatened species. Expand
Evolutionary biology: Island of the clones
The discovery of an all-female population of damselflies in the Azores archipelago provides a novelty for entomologists. It also highlights the unique selection pressures faced by species thatExpand
This volume represents a course of lectures delivered for several years to large classes of students who were admitted “without prerequisite” and deals with such topics as problems of population, immigration, and eugenics. Expand
Evolutionary Biology
▶ A forum for broad syntheses, in-depth treatment and controversial ideas in evolutionary biology ▶ Brings critical reviews, original research and commentaries to greater understanding of the originsExpand
Herpetol. J
  • Herpetol. J
  • 2004