Evolution of placentotrophy: using viviparous sharks as a model to understand vertebrate placental evolution

@article{Buddle2019EvolutionOP,
  title={Evolution of placentotrophy: using viviparous sharks as a model to understand vertebrate placental evolution},
  author={Alice L Buddle and James U. Van Dyke and Michael B. Thompson and Colin A. Simpfendorfer and Camilla M. Whittington},
  journal={Marine and Freshwater Research},
  year={2019}
}
Reproducing sharks must provide their offspring with an adequate supply of nutrients to complete embryonic development. In oviparous (egg-laying) sharks, offspring develop outside the mother, and all the nutrients required for embryonic growth are contained in the egg yolk. Conversely, in viviparous (live-bearing) sharks, embryonic development is completed inside the mother, providing offspring with the opportunity to receive supplementary embryonic nourishment, known as matrotrophy. Viviparous… 
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13 Citations

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Citation Type

The evolution and physiology of male pregnancy in syngnathid fishes
TLDR
The taxonomic distribution of syngnathid parity mode is assayed, the selective pressures that may have led to the emergence of male pregnancy are examined, the biology of synathids reproduction is described, and pressing areas for future research are highlighted.
Morphological basis for maternal nutrient provision to embryos in the viviparous fish Ataeniobius toweri (Teleostei: Goodeidae)
In viviparous Mexican fishes of the family Goodeidae, embryos develop in the maternal ovarian lumen. They typically absorb maternal nutrients during gestation by means of “trophotaeniae,” that is,…
Paternal nutrient provisioning during male pregnancy in the seahorse Hippocampus abdominalis
TLDR
The results of this study support the hypothesis that nutrient transport occurs in the most advanced form of male pregnancy in vertebrates and suggest that lipid yolk reserves being depleted by embryonic metabolism are replaced by the brooding father.
Structure of the paraplacenta and the yolk sac placenta of the viviparous Australian sharpnose shark, Rhizoprionodon taylori.
Structural changes to the brood pouch of male pregnant seahorses (Hippocampus abdominalis) facilitate exchange between father and embryos.
Structure and permeability of the egg capsule of the placental Australian sharpnose shark, Rhizoprionodon taylori
TLDR
This work investigates the structure and permeability of the egg capsules that surround developing embryos of the placental Australian sharpnose shark (Rhizoprionodon taylori) during late pregnancy and finds the thinnest egg capsule of any placental shark measured so far, which may increase the diffusion rate of respiratory gases, fetal wastes, water and nutrients between maternal and fetal tissues.
Reproductive Science in Sharks and Rays.
TLDR
Current reproductive technologies including computer assisted sperm assessments to study warming effects on sperm motility and intra-uterine satellite tags to determine birthing grounds will serve to generate data to mitigate anthropogenic changes that threaten the future of this vulnerable groups of fish.
Different Genes are Recruited During Convergent Evolution of Pregnancy and the Placenta
TLDR
It is concluded that redundancies in gene function have enabled the repeated evolution of viviparity through recruitment of different genes from genomic “toolboxes”, which are uniquely constrained by the ancestries of each lineage.
New Insights on Folliculogenesis and Follicular Placentation in Marine Viviparous Fish Black Rockfish (Sebastes Schlegelii)
TLDR
A new type of folliculogenesis and follicular placentation in Sebastes schlegelii is demonstrated suggesting the high convergence in vertebrate placenta evolution.
New insights on folliculogenesis and follicular placentation in marine viviparous fish black rockfish (Sebastes schlegelii).
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