Associazioni Algali e Fenomeni Secondari di Vulcanismo Nelle Acque Marine di Vulcano (Mar Tirreno)

Abstract

Seaweeds populations and secondary vulcanic phenomena off the Vulcan Isle (Tyrrhenian Sea). — In the marine waters off the Vulcan Isle (Tyrrhenian Sea) there are secondary vulcanic phenomena consisting in sulphureous (H₂S, SO₂, SO₃) emanations and in thermal springs. The A. describe relations between these phenomena and benthonical seaweeds populations. Cyanophyceae and Bacillariophyceae endure extreme values of pH (4,5) and temperature (48° C). The characteristic species of these biotopes are be found in earthly thermal Springs too. The vegetation of the neighbourhood is represented by perennial Phaeophyceae and by filamentous Ceramiaceae. Cystoseira ericoides, Cystoseira platyramosa, Sargassum flavifolium are newly found species from southern Tyrrhenian Sea and some Cyanophyceae for the first time are mentioned in marine waters.