Search results for "Lake"
showing 10 items of 369 documents
Climate change and enhancement of water-level fluctuations in Mediterranean reservoirs: a sad fate for water quality?
2010
Geological development of a gypsum lake formed at the beginning of the 2oth century in central Sicily, Italy: Integration of historical data with mod…
2006
A limnological investigation was carried out on the small, endorheic lake, called Lake Sfondato, located in central Sicily (Italy). All the aquatic environments in the central part of the island are rich in salt, with conductivity values above 5 mS cm−1, and are characterized by high alkalinity values and hard waters. In addition, due to intensive agriculture, many of these ecosystems have experienced a strong anthropogenic eutrophication over the last decades. In order to better understand the functioning of these peculiar environments, the morphology, hydrology, and geochemistry, as well as several selected physical and biological characteristics of Lake Sfondato, were studied in the year…
Tipologica ambiental de los sistemas leniticos de Huinay (Decima Region de Los Lagos, Chile) y distribucion del plancton limnico
2010
Mapping phycocyanin cells density of Planktothrix rubescens in freshwater reservoirs
2014
SMALL LAKES AND RESERVOIRS IN THE HILLS OF SICILY. MAINTAIN, SAVE AND RECOVER RURAL LANDSCAPE
2011
In the transition from nomadic to sedentary, people have tried - for their settlements - the most plenty of water, and the first cities were founded, in fact, along Tigris and Euphrates rivers, extraordinary water resources in a particular dry climate. In the most interior of Sicily, which has always been characterized by low rainfall, the farmers - over time - have tried various expedients for the preservation of rain water in order to allow its survival and crop. The use of new technologies and materials has resulted in recently hard impacts for landscape, while construction of small dams filled with earth, using natural soil impluviums and the nature of the land, made it possible to irri…
Opere prime di Vittorio Ugo a Monreale - parte 1°
2012
Vittorio Ugo (Palermo 1938-2005), riconosciuto come uno dei più rappresentativi teorici italiani di architettura, ha esordito come architetto nei primi anni Sessanta, ereditando l'importante studio professionale del padre. Le sue opere, inedite fino ad oggi, sembrerebbero aprire una nuova pagina di grande interesse per l'architettura del secondo Novecento in Sicilia.
Heterogeneous vertical structure of the bacterioplankton community in a non-stratified Antarctic lake
2013
10 páginas, 4 figuras, 2 tablas.
The genesis of actively growing siliceous stromatolites: Evidence from Lake Specchio di Venere, Pantelleria Island, Italy
2010
This study documents the attributes of siliceous stromatolites growing in the Lake Specchio di Venere, on the volcanic island of Pantelleria, Italy, in a setting characterized by very shallow cold waters and pools and by scattered hydrothermal activity, which exhales mainly CO2, at emission point temperatures of 34 to 58 °C. The saturation indexes indicate that the lake waters are saturated with respect to tridymite, cristobalite, chalcedony and quartz, and slightly undersaturated with respect to amorphous silica. Common roughly laminated and poorly lithified stromatolites show scanning electron microscope (SEM) evidence for silicified microbial mat structures, including biofilms, filamento…
Long-Term Coexistence of Rotifer Cryptic Species
2011
Despite their high morphological similarity, cryptic species often coexist in aquatic habitats presenting a challenge in the framework of niche differentiation theory and coexistence mechanisms. Here we use a rotifer species complex inhabiting highly unpredictable and fluctuating salt lakes to gain insights into the mechanisms involved in stable coexistence in cryptic species. We combined molecular barcoding surveys of planktonic populations and paleogenetic analysis of diapausing eggs to reconstruct the current and historical coexistence dynamics of two highly morphologically similar rotifer species, B. plicatilis and B. manjavacas. In addition, we carried out laboratory experiments using …
Adaptive radiation along a thermal gradient: preliminary results of habitat use and respiration rate divergence among whitefish morphs.
2014
Adaptive radiation is considered an important mechanism for the development of new species, but very little is known about the role of thermal adaptation during this process. Such adaptation should be especially important in poikilothermic animals that are often subjected to pronounced seasonal temperature variation that directly affects metabolic function. We conducted a preliminary study of individual lifetime thermal habitat use and respiration rates of four whitefish (Coregonus lavaretus (L.)) morphs (two pelagic, one littoral and one profundal) using stable carbon and oxygen isotope values of otolith carbonate. These morphs, two of which utilized pelagic habitats, one littoral and one …