Search results for " Ustica"

Benthic megafauna distribution in two different algal assemblages of the Ustica Island rocky infralittoral (NW Mediterranean)

2011

Petrographic and spectroscopic (FT-IR) study of Western Mediterranean obsidians geological sources and of a lithic collection from Ustica Island (Sic…

2019

I n this study we applied petrochemical methods (SEM-EDS; FT-IR) in order to characterize a group of obsidian flakes collected at Ustica island (Sicily). Despite the absence of obsidian geological outcrops, a lot of obsidian fragments still emerging from the lands of Ustica testify that the island was a major import center of obsidian during the prehistory. On this island, there are some prehistoric settlements, dated from the Neolithic to the Middle Bronze Age (6000- 1200 BC), in which the use of obsidian continued until the beginning of metals age. Our study includes: i) Macroscopic and microscopic optical observations, which allowed selecting 18 obsidian flakes (starting from 50 obsidian…

Can MPS's protect sea urchin stocks?

2017

Sea urchins have long attracted attention from scientists worldwide for their ecological role in coastal areas. Entire communities structures associated to kelp beds and related ecosystem functions were found to strictly depend on grazing by urchins. Sea urchins, in addition, have been used as a food resource by humans since prehistory, and presently they are one of the important sea food (both exploited from the wild and in part obtained from aquaculture) consumed in many regions, but also exported-imported through the world. In the Mediterranean sea, the purple sea urchin Paracentrotus lividus (Lamarck) exerts a key ecological as a main regulator of the structure of coastal communities. A…

La Genetica ... sulle tavole di Ustica

2019

Quale variabile crescente fa in modo che dei gemelli monozigoti, che notoriamente condividono DNA identico, mostrino, dalla nascita alla vecchiaia, sempre maggiori differenze fra loro? Si potrebbe intuitivamente rispondere: il tempo e l’ambiente, o meglio il tempo passato a vivere in un diverso ambiente. Ma fino a qualche decennio fa nessun genetista avrebbe mai ammesso che l’interazione fra il DNA e l’ambiente potesse influenzare l’espressione genica anche non mutando il DNA. Oggi, invece, e ormai da circa 15 anni, è oggetto di studio, l’Epigenetica, secondo la quale possono esistere modificazioni chimiche ed ereditabili del DNA che non scaturiscono da mutazioni della sua sequenza nucleoti…

Analisi della prateria a Posidonia oceanica (L.) Delile (Najadales, Potamogetonaceae)dell’Area Marina Protetta “Isola di Ustica” (Sicilia nord-occide…

2009

Vengono presentati i risultati di uno studio sul posidonieto dell’Area Marina protetta “Isola di Ustica” (Sicilia nord-occidentale), comprendente l’analisi lepidocronologica, fenologica e il censimento della flora epifita delle foglie e dei rizomi di Posidonia oceanica (L.) Delile (Najadales,Potamogetonaceae). Le osservazioni e i campionamenti sono stati effettuati in nove stazioni distribuite lungo tre transetti. I risultati ottenuti mostrano che attualmente la prateria è complessivamente in una situazione di equilibrio. Ciò indica buone condizioni ambientali anche se non ottimali per la fioritura della pianta dato che come risulta dall’analisi lepidocronologica e dalle osservazioni dirett…

Tidal notches, coastal landforms and relative sea-level changes during the Late Quaternary at Ustica Island (Tyrrhenian Sea, Italy)

2017

In this paper we present and discuss data concerning the morphostructural evolution at Ustica Island (Tyrrhenian Sea, Italy) during Late Quaternary. New insights on the relative sea-level changes of Ustica are coming from data collected during a geomorphological field survey around the island, together with the bathymetric analysis of the surrounding seabed and 14C datings on samples of speleothems, flowstones and marine shells found inside three selected sea caves. The survey was mainly accomplished on June 2015 through the first complete snorkel investigation off the about 18 km-long volcanic coast of the island, which allowed to precisely define location, relationship and morphometric fe…

Effetti del comportamento di Thalassoma pavo sul successo predatorio di Marthasterias glacialis

2011

Preliminary results of biocontrol agent against Fusarium oxysporum wilt of lentil landrace “Ustica”

2009

Influenza della protezione sulla struttura dei popolamenti algali. AMP "Isola di Ustica", un caso di studio

2008

Submerged speleothems and sea level reconstructions: a global overview and new results from the Mediterranean Sea

2021

This study presents a global overview of the submerged speleothems used to reconstruct paleo sea levels and reports new results from two stalactites collected in the Mediterranean Sea. Coastal cave deposits significantly contributed to the understanding of global and regional sea-level variations during the Middle and Late Quaternary. The studied speleothems cover the last 1.4 Myr and focused mainly on Marine Isotope Stages (MIS) 1, 2, 3, 5.1, 5.3, 5.5, 7.1, 7.2, 7.3 and 7.5. The results indicate that submerged speleothems represent extraordinary archives that can provide detailed information on former sea-level changes. The two stalactites collected in the central Mediterranean Sea, at Fa…