Search results for "ECOLOGIA"

I popolamenti faunistici pleistocenici della Sicilia.

2008

A revision of medium and small sized deer from the Middle and Late Pleistocene of Calabria and Sicily

2001

The remains of Megaceroides calabriae from Middle Pleistocene deposits at locality Bovetto (Southern Calabria) and of Megaceroides carburangelensis from the late Middle and Late Pleistocene locality Cimillà (South-eastern Sicily) are revised. These deer were considered as endemic species of strongly reduced size, related to genus Megaceroides (=Praemegaceros), which evolved in insular environment similarly to the endemic megaceroids from Sardinia, Corsica and Crete, M, cazioti and M. cretensis. The comparison of M. calabriae and M. carburangelensis with representatives of genera Megaceroides and Dama, carried out in the present study, shows that the Calabrian and Sicilian deer belong to Dam…

Pleistocene Calabrian and Sicilian bioprovinces

2002

During the Pleistocene, southern Calabria was the area through which several mammalian taxa dispersed into the Sicilian island via the Straits of Messina. The rich fossil record of Sicily allowed for the construction of a fairly detailed bio-chronological frame that is dated by correlation of vertebrate bearing deposits with marine deposits. At present five Faunal Complexes (F.C.), characterised by the occurrence of different taxa, have been recognised. The two older Faunal Complexes (Monte Pellegrino F.C.'xes Elephas falconeri F.C.) include taxa with differently marked endemic features denoting the occurrence of an insular system made up of geographically isolated small islands, with very …

Essential oils of Chiliadenus lopadusanus (Asteraceae).

2013

The essential oils from the leaves and flowers of Chiliadenus lopadusanus growing on Lampedusa Island were obtained by hydrodistillation and analyzed by GC-MS. The major component was camphor (39.4% in the leaves and 24.0% in the flowers), followed in the leaves by torreyol (6.7%), t-cadinol (5.2%) and 1,8-cineole (3.8%), while in the flowers by t-cadinol (15.2%), t-muurolol (5.1%) and torreyol (4.5%). Among the compounds identified, several seem to play a role in antibacterial, antifungal, allelopathic and spasmolytic activity. In addition, several compounds identified in this study seem to influence the attraction of Megachile (Eutricharaea) apicalis (Megachilidae) and Halictus (Seladonia…

Dating of a Sediment Core by 210Pbex Method and Pb Pollution Chronology in the Palermo Gulf (Italy)

2009

Within a more general study on marine sediments in the Gulf of Palermo (Sicily, Italy), the 210Pbex dating method (using a model with constant sedimentation rate) has been applied to one sediment core. The main goal of the research was to study the Pb pollution chronology. Dating of the core has allowed evaluating the time evolution of the gulf lead concentrations. Specific activities of 137Cs have also been measured in the sediment core sections as an independent confirmation of the chronology derived by the 210Pbex method. The time scale has then been used to correlate lead concentrations in core sections to estimated lead emissions in air due to gasoline combustion. A good correlation be…

Short-term low-severity spring grassland fire impacts on soil extractable elements and soil ratios in Lithuania

2017

Abstract Spring grassland fires are common in boreal areas as a consequence of slash and burn agriculture used to remove dry grass to increase soil nutrient properties and crop production. However, few works have investigated fire impacts on these grassland ecosystems, especially in the immediate period after the fire. The objective of this work was to study the short-term impacts of a spring grassland fire in Lithuania. Four days after the fire we established a 400 m2 sampling grid within the burned area and in an adjacent unburned area with the same topographical, hydrological and pedological characteristics. We collected topsoil samples immediately after the fire (0 months), 2, 5, 7 and …

Assessing anthropogenic pressures on coastal marine ecosystems using stable CNS isotopes: State of the art, knowledge gaps, and community-scale persp…

2015

Abstract In recent decades, the analysis of carbon, nitrogen and sulfur stable isotopes (SIA) has emerged as a powerful, viable methodology for examining food web structure and dynamics, as well as addressing a number of applied issues. Here, we provide a state-of-the-art review of the use of SIA for assessing anthropogenic pressures on natural ecosystems, in order to establish current knowledge gaps and identify promising applications for evaluating the ecological status of marine coastal waters. Specifically, the potential of SIA to provide food web-scale indicators for estimating cumulative anthropogenic pressures is addressed. The review indicates that the methodology has been used for …

Distribution of Heavy Metals in Marine Sediments of Palermo Gulf (Sicily, Italy)

2008

Concentrations of Cr, Cu, Hg, Pb and Zn have been measured, by atomic absorption spectrophotometry, in the fine fraction (<63 μm) of surface sediments collected in 30 sites in the Palermo Gulf (Sicily, Italy) in order to assess the levels and the spatial distribution of these elements. Enrichment factors calculated with respect to clean areas have been considered to discriminate between levels due to background or to pollution contributions. The sampling stations, which form a grid inside these areas, are characterized by geographic proximity and by the presence of pollution sources. Ratio matching technique along with hierarchical clustering, minimum spanning tree and principal component a…

GROWTH PERFORMANCE AND PHYSIOLOGICAL TRAITS OF POSIDONIA OCEANICA EXPOSED TO A HYPERSALINE ENVIRONMENT

Tranexamic acid for the prevention of blood loss after cesarean section: an updated systematic review and meta-analysis of randomized controlled tria…

2023

Objective: Tranexamic acid (TXA) is a cost-effective intervention for the prevention of postpartum hemorrhage (PPH) in women undergoing cesarean section but the evidence to support its use is conflicting. We conducted this meta-analysis to evaluate the efficacy and safety of TXA in low- and high-risk cesarean deliveries. Data sources: We searched MEDLINE (via PubMed), Embase, the Cochrane Library, ClinicalTrials.gov, and WHO International Clinical Trials Registry Platform (ICTRP) portal from inception to April 2022 (updated October 2022 and February 2023) with no language restrictions. Additionally, grey literature sources were also explored. Study eligibility criteria: All randomized contr…