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THE PEARL MUSSEL, MARGARITIFERA MARGARITIFERA (L.), IN HARD WATER IN IRELAND

Up until about 80 years ago it was believed that hard water was inimical to Margaritifera margaritifera. Once found in the calcium-rich waters of the Barrow, Nore and Suir rivers, the hard-water form of M. margaritifera has become extinct in all but one of these rivers in the past 50 years. The surviving depleted population in the Nore is threatened with the same fate. In an experiment to test the hypothesis that the species was not strictly calcifuge, specimens were transferred from a soft-water river to the hard-water Nore and then returned to their natal water after six months. An examination