Male pregnancy

@article{Jones2003MaleP,
  title={Male pregnancy},
  author={Adam G. Jones and John C. Avise},
  journal={Current Biology},
  year={2003},
  volume={13}
}
Don’t try this at home! Male pregnancy is an alien concept to us mammals. Yet this phenomenon is the universal reproductive mode of pipefishes, seahorses and sea dragons (family Syngnathidae, with more than 200 species). During mating, a female uses an ovipositor to transfer dozens or hundreds of her unfertilized eggs to the underside of a male, where he fertilizes them. Dad then carries his developing offspring for several weeks until they are born as tiny, independent young. The enclosed… Expand
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TLDR
Genetic studies of the genetic mating systems of pipefishes and seahorses have provided insights into important aspects of the natural history and evolution of these fishes, and suggest that the sexual selection gradient (or Bateman gradient) may be a substantially better method for characterizing the mating system than previously available techniques. Expand
Pipefishes and seahorses: Are they all sex role reversed?
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These studies emphasize that sex role reversal is not synonymous with male parental care and there is an apparent association between the mating pattern and the sex roles: polygamous species show reversed sex roles whereas monogamous species exhibit 'conventional' sex roles. Expand
Sympatric speciation as a consequence of male pregnancy in seahorses
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The results indicate that sympatric speciation is a plausible mechanism for the diversification of seahorses, and that assortative mating (in this case as a result of male parental care) may warrant broader attention in the speciation process for some other taxonomic groups as well. Expand
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