Abstract
A FEW species of animals which were known to be marine have become freshwater dwellers. An example of these freshwater mutants is the gastropod Hydrobia jenkense which, according to Ellis1, was known to have been confined to brackish waters until the early part of the last century and is now abundant in freshwater in many parts of Great Britain and seems to be spreading widely in continental Europe.
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References
Ellis, T. G., “British Snails” (Oxford Univ. Press, 1926).
Broch, H., Trans. Zool. Soc. Lond., 22, 133 (1927).
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SHATOURY, H. A Freshwater Mutant of Balanus amphitrite . Nature 181, 790–791 (1958). https://doi.org/10.1038/181790a0
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DOI: https://doi.org/10.1038/181790a0
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