Dissolution of Sexual Signal Complexes in a Hybrid Zone between the Swordtails Xiphophorus birchmanni and Xiphophorus malinche (Poeciliidae)

Rosenthal, Gil G.; Reyna, Xochitl Fabiola De la Rosa; Kazianis, Steven; Stephens, Matthew J.; Morizot, Donald C.; Ryan, Michael J.; León, Francisco J. Garcı́a de

doi:10.1643/0045-8511(2003)003[0299:dossci]2.0.co;2

Cited by 58 publications

(91 citation statements)

References 25 publications

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“…The best documented example is a hybrid zone of two northern swordtail species, X. birchmanni and X. malinche, in the Rio Calnali. (74) Up to 50% of all animals at certain sites in this Red lines connect species where at least one partner has Xmrk and where hyperpigmentation and melanoma has been observed in laboratory crosses (52,63,64,70,74,79) and unpublished data). Grey lines connect sympatric species where the formation of hybrid pigmentation disorders has not been seen so far in crossing experiments but cannot be excluded if other genotypes or populations would be used.…”

Section: Xmrk As a Speciation Gene: No Support From Laboratory Experimentioning

confidence: 77%

“…However, this hyperpigmentation was far from being diagnosable as a malignant pigmentary lesion. (74) X. birchmanni forms also a hybrid zone with a second species, X. cortezi, int the Río Xiliatl (Carla Gutié rrez and Molly Morris, personal communication). At another locality hybrids between a northern platyfish species, X. variatus, and a northern swordtail, X. nezahualcoyotl, have been identified (10) .…”

Section: Xmrk As a Speciation Gene: No Support From Laboratory Experimentioning

confidence: 99%

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Evolution of Xmrk: an oncogene, but also a speciation gene?

Schartl

2008

BioEssays

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Genes that exert their function when they are introduced into a foreign genetic background pose many questions to our current understanding of the forces and mechanisms that promote either the maintenance or divergence of gene functions over evolutionary time. The melanoma inducing Xmrk oncogene of the Southern platyfish (Xiphophorus maculatus) is a stable constituent of the genome of this species. It displays its tumorigenic function, however, almost exclusively only after inter-populational or, even more severely, interspecific hybridization events. The Xiphophorus hybrid melanoma system has gained attention in biomedical research as a genetic model for studying tumor formation. From an evolutionary perspective, a prominent question is: how could this gene persist over millions of years? An attractive hypothesis is that Xmrk, acting as a detrimental gene in a hybrid genome, could be a speciation gene that shields the gene pool of its species from mixing with other closely related sympatric species. In this article, I briefly review our current knowledge of the molecular genetics and biochemical functions of the Xmrk gene and discuss aspects of its evolutionary history and presence with respect to this idea. While Xmrk as a potentially injurious oncogene has clearly survived for millions of years, its role as a speciation gene has to be questioned.

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Section: Xmrk As a Speciation Gene: No Support From Laboratory Experimentioning

confidence: 77%

Section: Xmrk As a Speciation Gene: No Support From Laboratory Experimentioning

confidence: 99%

Evolution of Xmrk: an oncogene, but also a speciation gene?

Schartl

2008

BioEssays

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“…[1][2][3] More recently, we have found several natural hybrid zones between X. malinche and X. birchmanni, 46 and we and other workers have observed morphological and molecular evidence of hybridization between several other species pairs. These hybrid zones offer an opportunity to study how species-specific trait and preference complexes are disrupted in nature.…”

Section: Hybridization and Sexual Behaviormentioning

confidence: 94%

Sexual Behavior, Genes, and Evolution inXiphophorus

Rosenthal

León

2006

Zebrafish

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A century of research into both behavior and genetics in Xiphophorus has yielded important insights into the genetic architecture underlying sexual behavior, particularly as concerns male courtship and mating strategies. Two Y-linked loci underlie much of the variation in male mating strategies, possibly reflecting selection for modularization. Courtship behavior elements, in contrast, are under polygenic control. Little is known about the genetics of female mating preferences, yet behavioral evidence suggests that female preference complexes typically do not map on to suites of male traits. Natural hybrid zones in Xiphophorus present an ideal system for studying the evolutionary genetics of male traits and female preferences using contemporary molecular techniques.

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“…An exception was a study that showed disruption of female preference for conspecific male odour cues potentially leading to hybridization in the wild (Fisher et al 2006). Evidence suggested a recent hybridization event between two closely related swordtail species in the Río Calnali (Mexico), Xiphophorus birchmanni and X. malinche, with the majority of hybrids descended from X. birchmanni females (Rosenthal et al 2003). Fisher et al (2006) experimentally confirmed that female X. birchmanni preferred conspecific over heterospecific males in clean water but lost this preference when tested using water from the river (i.e.…”

Section: Chemicalmentioning

confidence: 99%

Communication in troubled waters: responses of fish communication systems to changing environments

et al. 2010

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Fish populations are increasingly being subjected to anthropogenic changes to their sensory environments. The impact of these changes on inter-and intra-specific communication, and its evolutionary consequences, has only recently started to receive research attention. A disruption of the sensory environment is likely to impact communication, especially with respect to reproductive interactions that help to maintain species boundaries. Aquatic ecosystems around the world are being threatened by a variety of Inke van der Sluijs and Suzanne M. Gray contributed equally to the paper.

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Dissolution of Sexual Signal Complexes in a Hybrid Zone between the Swordtails Xiphophorus birchmanni and Xiphophorus malinche (Poeciliidae)

Cited by 58 publications

References 25 publications

Evolution of Xmrk: an oncogene, but also a speciation gene?

Evolution of Xmrk: an oncogene, but also a speciation gene?

Sexual Behavior, Genes, and Evolution inXiphophorus

Communication in troubled waters: responses of fish communication systems to changing environments

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