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Ontogeny of daily changes in extrathyroidal thyroid hormone concentrations in two anuran species (Rana perezi and xenopus laevis)
Gancedo, B.; Alonso-Gómes, A.L.; De Pedro, N.; Valenciano, A.I.; Delgado, M.J.; Alonso-Bedate, M. (1995). Ontogeny of daily changes in extrathyroidal thyroid hormone concentrations in two anuran species (Rana perezi and xenopus laevis). Neth. J. Zool. 45(1-2): 210-212
In: Netherlands Journal of Zoology. E.J. Brill: Leiden. ISSN 0028-2960, more
Peer reviewed article  

Available in Authors 

Keywords
    Marine; Terrestrial

Authors  Top 
  • Gancedo, B.
  • Alonso-Gómes, A.L.
  • De Pedro, N.
  • Valenciano, A.I.
  • Delgado, M.J.
  • Alonso-Bedate, M.

Abstract
    The day/night changes into thyroxine (T4) and tiiodothyronine (T3) whole-body concentration in Rana perezi and Xenopus laevis throughout ontogeny have been studied. Daily cyclesin thyroid hormones (TH) with higher nocturnal values appear during premetamorphosis in both species. Cyclicity diseppears for T3, while it is reserved for T4, in prometamorphic larvae. In X laevis higher nocturnal T3 and T4 values were observed at the end of climax.

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