Search results for " Sicily."

Aldina Cutroni Tusa: una vita per la numismatica

2017

The article traces the main stages in the life and scientific production of Aldina Cutroni Tusa, scholar and professor of Numismatics at the University of Palermo.

Comparison among the alien floras of Sardinia, Sicily and the Balearic Islands

2009

Altari

2019

the contribution identifies and analyzes the success and operational fallout in Sicilian architecture of the seventeenth and eighteenth centuries, of models for altars disseminated through the press. The theme of the altars indeed presents punctual connections with the world of model prints. As in other cases, these engravings were not only aimed at architects but were also intended for a wider world of operators, especially wood sculptors. Between the end of the seventeenth century and the first half of the eighteenth century, the project area in question knows mutations starting from new texts.

Considerazioni tassonomiche e cariologiche sulle popolazioni siciliane di Sternbergia colchiciflora Waldst. & Kit. (Amaryllidaceae)

2004

A citotaxonomic study on two Sicilian populations of Sternbergia colchiciflora from Madonie and Mt. Etna was carried out. They show marked differences in their morphology and caryology.This suggests to treat them as two distinct taxa, but their correct taxonomic position needs further investigation on other populations of Sternbergia colchiciflora from Mediterranean area

Breeding phenology of Bufo viridis Laurenti, 1768 in Sicily (S Italy)

2006

Is the painted frog Discoglossus pictus a declining species in Italy? On the reliability of a distributional atlas approach

2013

The conservation status of amphibians is often assessed using public databases because of a lack of up-to-date field data. However, it is crucial that this kind of data is used carefully, evaluating the reliability and the consistency of the information. In Italy, the conservation status of the painted frog, Discoglossus pictus, was recently assessed using public databases, and the outcome highlighted a worrying situation for the species. We analyzed the reliability of these conclusions and reassessed the status of the painted frog, taking into account its insular distribution and new data of species occurrence. Our results contrast with the previous analysis and show how an incautious use …

The large invasive population of Xenopus laevis in Sicily, Italy

2008

AbstractThe worldwide spread of invasive species is considered to be one of the main causes of global amphibian declines and the loss of biodiversity in general. The African Clawed Frog, Xenopus laevis, shows a strong ability to establish populations and invade various geographic regions. In 2004 X. laevis was found in Sicily for the first time. The Sicilian population is probably the largest in Europe with a range of about 225 km2 in an area characterized by numerous agricultural ponds. This high density of ponds has potentially facilitated the dispersal of X. laevis. The frogs can move far from rivers or watercourses by utilizing the ponds as suitable "islands". The analysis of their diet…

Effect of number of seed parents on the genetic diversity of artificially regenerated stands of holm oak

2007

Artificial populations of holm oak (Quercus ilex L. s.l.) and their natural seed origin populations selected from Andalusia (Southern Spain) and Sicily (Southern Italy) were analysed with six nuclear microsatellite loci to explore the effect of seed collection methods. Low effective allele numbers (3.07-6.67) and extremely low effective populations sizes (35.4-102.9) were detected in both reforestation stands, probably due to an inappropriate forester seed collection strategy limited to a few mother trees. Analysis of simulated progenies showed that optimal sampling size to obtain seed collections genetically similar to the origin populations should range from 20 to 50 individuals, but coul…

Exploiting historical rainfall and landslide data in a spatial database for the derivation of critical rainfall thresholds

2017

Critical rainfall thresholds for landslides are powerful tools for preventing landslide hazard. The thresholds are commonly estimated empirically starting from rainfall events that triggered landslides in the past. The creation of the appropriate rainfall–landslide database is one of the main efforts in this approach. In fact, an accurate agreement between the landslide and rainfall information, in terms of location and timing, is essential in order to correctly estimate the rainfall–landslide relationships. A further issue is taking into account the average moisture conditions prior the triggering event, which reasonably may be crucial in determining the sufficient amount of precipitation.…

Studio preliminare su composizione e provenienza di ocra dalla sepoltura epigra-vettiana di Grotta d’Oriente A, Favignana (Egadi, Sicilia)

2022

La Grotta d’Oriente, sull’isola di Favignana (Egadi, Sicilia) ha restituito una serie di sepolture e resti umani ascrivibili all’Epigravettiano finale e al Mesolitico. La Sepoltura cosiddetta Oriente A, epigravettiana, è caratterizzata da un corredo fittile consistente in conchiglie e in un ciottolo con tracce di ocra rossa. Da un punto di vista della ricostruzione ar-cheologica e della definizione degli scenari di ecologia preistorica è molto importante la caratterizzazione chimica e la deter-minazione della provenienza di questo pigmento che, com’è noto, caratterizza molti scenari paleolitici. La ricerca presenta i dati preliminari dell’analisi SEM/EDS/EDAX dei pigmenti ocracei prelevati …