Abstract
Abstract Ecological observations dealing with some seaweeds of Bay of Naples in connection to their vertical zonation. — The algal zonation in a basaltic locality of the Bay of Naples was studied by the A. in order to get some data about the environmental requirements of seaweeds living in that locality. He pointed out the vegetation girdles of: a) « Bangia fuscopurpurea », « Gelidium pusillum », « Nemalion helmintoides » in the supra-littoral belt; b) « Corallina mediterranea » and « Enteromorpha compressa » in the eu-littoral belt; c) « Pterocladia capillacea », « Scytosiphon lomentarius », « Callithamnion granulatum » and « Derbesia tenuissima » in the infra-littoral belt, studied to 70 cm below the water mark. All these belts are overlapped by that of « Porphyra leucosticta ». « Bangia fuscopurpurea » seems to have a scarce adaptability, since it vegetates exclusively on the rocks spraied by the waves, but never submerged, so that this girdle is very large only in the more exposed localities; this sea...
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