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Seasonal Changes in the Contents of Inorganic Ions in the Blood of Rana Esculenta

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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).

1. The blood of the frog (Rana esculenta) was examined over a period of twenty-one months with respect to the concentrations of chloride, sodium, and potassium ions and total protein. 2. The changes in the concentrations of these components were coördinated with two kinds of established data: on the one hand the annual three-monthly period of reproduction in the aquatic habitat, on the other the annual cycle of activities of the endocrine system. 3. The chloride ion concentration showed a significant fall, particularly at the time of transition from the ecological winter to the reproductive period. The sodium ion concentration showed a significant fall, above all, at the transition from the reproductive period to the ecological summer. No such changes were found in the case of potassium and total protein. 4. A connexion is suggested with other rhythmic phenomena.

Affiliations: 1: (Department of Zoology, Catholic University, Nijmegen, The Netherlands


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