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Abstract
First data on the seaweeds of the reef « I Travi » of Portonovo (Ancona). — The reef « I Travi » is formed by a series of nearly vertical rock strata which from Mount « I Corvi » dip into the sea with a general direction WNW-ESE. The rock face looking towards the open sea (that is roughly to the North) is exposed to the action of the waves. The sea is particulary rough when the wind blows from the North (« Bora »), and the East (« Levante »).
The temperature of the water throughout the year varies from 9.5[ddot] C in February to 27 [ddot]C in September, that is over a range of 17.5 [ddot]C. In June the salinity of the water was of 33.6%, and the pH had a value of 8.1. Ascending and descending currents and water movements seem to mix efficiently the upper and lower waters.
The seaweed population of the rock face varies longitudinally. In the Wetsern part Acetabularia is dominant; there is a central part with prevalence of Cystoseira, and an eastern part with prevalence of Ceramium and Cladophora. Vertically one can distinguish: a Littoral Zone of 40–45 cm (maximum amplitude of the tides) with Cladophora, Enteromorpha, and other Chlorophyceae; an Infralittoral Zone with predominance of Cystoseira, Gracilaria, and, lower down of various Rhodophyceae. The Eulittoral Zone is missing.
