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6 results for “Xiphophorus clemenciae”
Fig. 4 in Two New Species of Xiphophorus (Poeciliidae) from the Isthmus of Tehuantepec, Oaxaca, Mexico, with a Discussion of the Distribution of the X. clemenciae Clade
Fig. 4. Photomicrographs of the distal part of gonopodia of clemenciaeclade fishes. A. Gonopodium of a X. clemenciae. B. Gonopodium derived from a X. mixei. C. Gonopodium excised from a X. monticolus. Scale bar for X. mixei is 0.5 mm and applies to all three images. Arrowheads depict the most distal spine of ray 3, which differs among taxa (see text).
Fig. 1 in Two New Species of Xiphophorus (Poeciliidae) from the Isthmus of Tehuantepec, Oaxaca, Mexico, with a Discussion of the Distribution of the X. clemenciae Clade
Fig. 1. Xiphophorus fishes of the Coatzacoalcos River System. A, B. X. mixei female and male. C, D. X. monticolus female and male. E, F. X. clemenciae female and male. G, H. X. helleri female and male. I, J. X. maculatus female and male.
Fig. 3. A in Two New Species of Xiphophorus (Poeciliidae) from the Isthmus of Tehuantepec, Oaxaca, Mexico, with a Discussion of the Distribution of the X. clemenciae Clade
Fig. 3. A. Photomicrograph of the distal part of a gonopodium of a X. helleri (Rio Robalo). Scale bar is 0.5 mm. B. Closeup of gonopodium shown in panel A, showing anatomical nomenclature used in gonopodial descriptions (after Gordon and Rosen, 1951). Scale bar is 0.16 mm.
Fig. 2 in Two New Species of Xiphophorus (Poeciliidae) from the Isthmus of Tehuantepec, Oaxaca, Mexico, with a Discussion of the Distribution of the X. clemenciae Clade
Fig. 2. Data points recorded for morphometric measurements. Drawing of a male X. clemenciae with morphological landmarks indicated (see text).
Data from: An evaluation of the hybrid speciation hypothesis for Xiphophorus clemenciae based on whole genome sequences
Once thought rare in animal taxa, hybridization has been increasingly recognized as an important and common force in animal evolution. In the past decade, a number of studies have suggested that hybridization has driven speciation in some animal groups. We investigate the signature of hybridization in the genome of a putative hybrid species, Xiphophorus clemenciae, through whole genome sequencing of this species and its hypothesized progenitors. Based on analysis of this data, we find that X. clemenciae is unlikely to have been derived from admixture between its proposed parental species. However, we find significant evidence for recent gene flow between Xiphophorus species. Though we detect genetic exchange in two pairs of species analyzed, the proportion of genomic regions that can be attributed to hybrid origin is small, suggesting that strong behavioral pre-mating isolation prevents frequent hybridization in Xiphophorus. The direction of gene flow between species supports a role for sexual selection in mediating hybridization.
Data from: An evaluation of the hybrid speciation hypothesis for Xiphophorus clemenciae based on whole genome sequences
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