Abstract
A survey of the freshwater crustacean fauna of the island of Rhum (Inner Hebrides) revealed at least 68 species. Information is provided on die distribution and ecology of these, and individual preferences are noted. These preferences lead to assemblages found in habitats whose ecological attributes can be related to geological, edaphic and chemical features of the environment. While species diversity on the island as a whole is perhaps greater than might have been anticipated, that of individual water bodies tends to be low, the maximum number ol species in any one water body being 2 7. The fauna includes a sizeable element of species that favour acidic waters of various kinds or oligotropliic/dystrophic lakes and pools of low ionic content, and includes a number of northern or burco-Alpine species. The origin of this isolated fauna is briefly considered.
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