Giuseppe Giaccone

Raccolte Di Fitobenthos Sulla Banchina Continentale Italiana

Abstract Phytobenthos from italian continental shelf. — The A. states the results of 8 years explorations, by diving techniques, in 44 stations of italian coast. It has been collected 620 floral entities with the following composition: 74 Myxophyceae, 96 Chlorophyceae, 2 Xantophyceae, 108 Phaeophyceae, 336 Rhodophyceae and 4 Phanerogamae. For each species verified geographical distribution in the explored stations is reported. Besides recent literature on the studied biotopes is cited.

Raccolte Di Fitobenthos Nel Mediterraneo Orientale

Abstract Phytobenthos from Eastern Mediterranean Sea. — The A. states the results of an exploration, by diving techniques, in the Eastern Mediterranean Sea, along 13 stations located in the midle-western and southern region of the Aegean Sea. Besides to the values of various ecology elements (saltness, brightness, nutrition salts), informations about reologic regime in the Aegean Sea are reported. It has been collected 175 floral entities, with the following per cent composition: Chlorophyceae 14,5%, Phoeophyceae 17,0%, Rhodophyceae 68,3%. Eastern Mediterranean Sea underwater flora presents in the explored stations a R/P index equal to 4, which characterizes it as a subtropical one.

Studio preliminare sulla tipologia della vegetazione sommersa del Canale di Sicilia e isole vicine

Abstract Preliminary studies on the marine phythobenthic communities in the Straits of Sicily and adjacent islands. — The results of algological researches carried out by the Gruppo di Algologia of the S.B.I. in the Straits of Sicily and adjacent islands are reported. 288 species have been collected, 275 of which have been identified: 160 were Rhodophyta, 62 Phaeophyta, 32 Chlorophyta, 16 Cyanophyta and 2 Angiospermae. The vegetational research leads to the following conclusions: 1 - the harbour areas (Pantelleria, Malta: loc. 1 and 11) show a nitrophile vegetation, particulary near La Valletta where an almost pure population of Pterocladia pinnata is found; 2 - there are important biogeographical differences between Pelagie islands (Lampedusa, Linosa) and Pantelleria. In fact the former ones have an algal flora composed mostly of eastern mediterranean species, whilst the latter shows strong affinities with the north-african basin, as is demonstrated by the rich well developed belt of Cystoseira sedoides;...

Note Sistematiche ed Osservazioni Fitosociologiche Sulle Laminariales del Mediterraneo Occidentale

Abstract Laminariales from western Mediterranean Sea: taxonomical and phytosociological study. — Laminariales found in the Mediterranean Sea are: Laminaria rodriguezii Bornet, L. ochroleuca De la Pylaie, Saccorhiza polyschides Batters, Phyllaria reniformis Rostafinski, Ph. purpurascens Rostafinski. By diving technique L. rodriguezii and Ph. reniformis was collected off isles Ustica, Stromboli, Pianosa and Montecristo (Thyrrenean Sea) from 50 to 90 mts depth in the coralligenous biocoenose; L. ochroleuca and Ph. purpurascens between Scilla and Ganzirri in the straits of Messina from 45 to 85 mts depth in facies of deep rheophilous biocoenoses; S. polyschides and Ph. reniformis near Villa S. Giovanni and Messina in the facies with Ulva-Corallina-Dictyopteris of photophilous algae biocoenose. Algal vegetation associated with these species of Laminariales in the straits of Messina is characterized by Atlantic-temperate elements (Ulva olivascens, Halurus equisetifolius, Cryptopleura ramosa, Giffordia hincksiae...

Contributo Allo Studio Fitosociologico Dei Popolamenti Algali Del Mediterraneo Orientale

Abstract Marine phytocoenoses in the Eastern Mediterranean Setz. — In this paper a survey is given on the benthic communities observed in the Eastern Basin of the Mediterranean Sea. The investigation was carried out in 13 localities with aid of diving technique, down to 70 mt. depth. Samples at greater depths were collected with the use of a bottom-dredge. The data obtained from 56 phytoso-ciological «releves» are shown in the 6 tables in the text. The ecological analysis has pointed out the subtropical character of the biocoenoses encoutered, due to the environmental factors. The surface Corallinaceae communities and the depth one, markedly in its precorraligenous facies, have exhibited the most conspicuous and subtropical characters. A comparative survey is carried out with the analogous formation which are found in the Western Mediterranean Basin. An attempt is made to interpret the ecological requirements of some algal species, whose distribution in the Mediterranean Sea is of particular interest. The...

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.

Specie Nuove e Interessanti di Rhodophyceae Raccolte Nel Bacino Orientale del Mediterraneo

Abstract New and interesting species of Rhodophyceae from the Eastern Mediterranean Sea. — A description is given of four newly found species of Rhodophyceae from the Eastern Mediterranean Sea. The specimens were collected during the course of a 1967 N.A.T.O. Oceanographic Expedition in the Eastern Mediterranean Sea with the aid of diving technique. The specimens-typus are deposited with Herbarium of Botanical Institut of Trieste. The newly found species are the following: Halymenia cavernicola G. Giaccone, Phyllophora aegei G. Giaccone, Ceramium hellenicum G. Giaccone, Centroceras pignattii G. Giaccone. A short description of three interesting Corallinaceae (Lithophyllum byssoides Fosl. f. byssoides, L. tortuosum Fosl. f. cristata Fosl., Tenarea undulosa Bory) is also given. Data are added on the coralligenous communities examined in two «releves» at high and low depths. Dichotomous and synoptical keys to the new species are suggested: Gen. Halymenia Ag. I - Thallus broad more than 5 cm. (H. fioresia, ul...

Aspetti Della Biocenosi Coralligena in Due Stazioni Dei Bacini Occidentale Ed Orientale Del Mediterraneo

Abstract Facies of the coralligenous biocoenose in two stations of the Western and Eastern Mediterranean Basins. — The benthic comunities of circalittoral region have been studied by diving technique in the Western and Eastern Mediterranean Basins. The facies of the coralligenous biocoenose which show a larger difference between the two Basins are: 1) the communities of non calcareous algae in biotopes with constant direction depth streams and 2) the precoralligenous facies. These communities in the Aegean Sea are characterized by Sargassum linifolium, Cystoseira corniculata v. laxior, Caulerpa prolifera, Udotea petiolata, Dasycladus clavaeformis and by sponge Calix nicaeensis; in the Thyrrenean Sea by Laminaria rodriguezii, Cystoseira spinosa, Neurocaulon grandiflorum, Fauchea repens, Halymenia dichotoma, Callymenia reniformis and by the sponge Axinella cannabina. The environmental factors which determine these different facies in the circalittoral region of the two Mediterranean Basins are chiefly the t...

Sur quelques algues du Détroit de Messine et des environs de la Sicile

Abstract On some seaweeds collected on the Straits of Messina and off the Sicilian coasts. – 2 Phaeophyceae of the ordines Dictyotales and Desmarestiales and 17 Rhodophyceae of the ordines Cryptonemiales, Gigartinales and Ceramiales are collected for the first time in the Mediterranean Sea (for Desmarestia ligulata) or in some localities off the Sicilian coasts and off the circumsicilian isles. For each species systematic and distribution data are reported.

Helminthocladia hudsonii (C. Ag.) J. Ag.: prima segnalazione per il Mediterraneo

Abstract Helminthocladia hudsonii (C. Ag.) J. Ag. new for the Mediterranean Sea. – In this paper the genus Helminthocladia (Florideae, Nemalionales) is for the first time recorded for the Mediterranean Sea. H. hudsonii was collected in the Straits of Messina near Villa S. Giovanni (Italy) at 3 mts depth (5 august 1970). Data on the habitat, geographic distribution, structure and reproduction of this species are reported.