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Ontogeny of Daily Changes in Extrathyroidal Thyroid Hormone Concentrations in Two Anuran Species (Rana Perezi and Xenopus Laevis)

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image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

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

Affiliations: 1: Departamento de Biología Animal (Fisiología Animal), Facultad de Ciencias Biológicas, Univer-sidad Complutense, 28040 Madrid, Spain


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