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HOW COMMON IS HOMOPLOID HYBRID SPECIATION?
TLDR
It is concluded that although hybridization appears to be common, evidence for an important role of hybridization in homoploid speciation is more circumscribed.
Female preference for swords in Xiphophorus helleri reflects a bias for large apparent size.
TLDR
Female preference for a sworded male was abolished by enlarging the image of a swordless male to compensate for the reduction in length caused by removing the ornament, consistent with mate choice being mediated by a general preference for large males rather than by specific characters.
Natural selection interacts with recombination to shape the evolution of hybrid genomes
TLDR
Three replicate hybrid populations that formed naturally between two swordtail fish species are studied, estimating their fine-scale genetic map and inferring ancestry along the genomes of 690 individuals and indicate that selection on swordtail hybrids stems predominantly from deleterious combinations of epistatically interacting alleles.
Alteration of the chemical environment disrupts communication in a freshwater fish
TLDR
It is shown that chemically mediated species recognition in a swordtail fish, Xiphophorus birchmanni, can be hindered by anthropogenic disturbance to the signalling environment, which can have a drastic effect on natural populations through their specific impact on communication systems.
Replicated hybrid zones of Xiphophorus swordtails along an elevational gradient
TLDR
It is shown that widespread hybridization has occurred between two neo‐tropical stream fishes with partial reproductive isolation, and Phylogenetic analyses of mitochondrial sequence data showed that the swordtail fish Xiphophorus birchmanni is monophyletic and that X. malinche is part of an independent monophyletsic clade with other species.
Repeated losses of PRDM9-directed recombination despite the conservation of PRDM9 across vertebrates
TLDR
It is shown that swordtail fish carrying only a partial but conserved ortholog share recombination properties with PRDM9 knock-outs, suggesting that all domains are necessary for directing recombination.
PHYLOGENOMICS REVEALS EXTENSIVE RETICULATE EVOLUTION IN XIPHOPHORUS FISHES
TLDR
The results allow us to reexamine a long‐standing controversy about the evolution of the sexually selected sword in Xiphophorus, and demonstrate that hybridization has been strikingly widespread in the evolutionary history of this genus.
A private ultraviolet channel in visual communication
TLDR
It is shown that ultraviolet (UV) signalling in northern swordtails (Xiphophorus) affords a channel for communication that is not accessible to their major predator, Astyanax mexicanus, the Mexican tetra, and cross–species comparisons support the hypothesis that natural selection drives the use of UV communication.
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