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Plasma Prolactin Levels Related To Changes of Salinity in the Green Water Frog, 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).

In this study the involvement of prolactin (PRL) in the adaptation to different salinities by the frog, Rana esculenta, has been studied. Two different populations of male frogs were investigated, one living at sea level in a lagoon in which the salinity varies in the range of 2 to 10 ‰, and the other in a freshwater mountain pond. The results show that the values of plasma PRL are not significantly higher in freshwater frogs than in those of the lagoon. Furthermore, an increase in salinity induces an increase of plasma PRL in freshwater frogs but not in lagoon frogs.

Affiliations: 1: Department of Biology (MCA), University of Camerino, Italy; 2: Department of Biology, School of Education, Waseda University, Nishi Waseda, Tokyo 169-50, Japan


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