Euryhaline ecotypes in some species ofStigeocloniumKütz

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Abstract
About 50 Stigeoclonium strains, mainly classified as S. aestivale and S. tenue, collected from a range of habitats with respect to salinity (about 0–10 g l-1 chlorine), were assayed for chlorine tolerance in the laboratory. The laboratory salinity responses agreed very well with the salinity regimes of the original habitats and so the salinity differences of the habitats caused a chloride dependent distribution of the investigated strains. Additional adaptation experiments pointed out that the strain specific responses were genetically fixed and this led to the distinction of euryhaline, stenohaline and intermediate ecotypes in S. aestivale and S. tenue.
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