The Chloride Regulation of the Brackish and Fresh-Water Races of Mesidotea Entomon (L.)

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Abstract
1. Mesidotea entomon (L.) is found in the Baltic and in certain fresh-water lakes in Sweden. It is believed that colonization of fresh water in this region has taken place since the last Ice-age. 2. In the present work animals from brackish and fresh-water habitats have been compared both in respect of the concentration of chloride in their haemolymph and of their ability to survive in media of various salinities. 3. Both fresh-water and Baltic animals have been found able to survive in Plymouth sea water, the concentration of chloride in their haemolymph being close to the concentration of chloride in this medium. 4. Baltic animals could not be acclimatized to fresh water. 5. Animals from both habitats have the same general level of chloride concentration in their haemolymph when acclimatized to dilute sea water. 6. These results are discussed in relation to the evolution of a fresh-water race from a brackish-water race.

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