1,721,002 research outputs found
Effetti indotti da anossia ed ossigenazione forzata sulla composizione biochimica della sostanza organica sedimentaria: risultati di una ricerca in vitro
No full textEffetti indotti dall'alternanza stagionale e dalla presenza di copertura vegetale sui livelli di contaminazione del sedimento (Orbetello, Italia)
No full textA combinated approach to investigate the biochemistry and hydrography of a shallow bay in the South Adriatic Sea: The Gulf of Manfredonia (Italy)
No full textThe main goal of this study is to understand the hydrological and biochemical set up and processes of a marine coastal area located in the western side of the south Adriatic sea (the gulf of Manfredonia) by the use of both satellite images and in situ investigations A water sampling in the gulf of Manfredonia was performed at 18 fixed stations in June 2003; physico-chemical and biological parameters (temperature, salinity, dissolved oxygen and fluorescence) were measured along the water column and water samples were collected to analyse dissolved nutrients (ammonia, nitrite, nitrate, phosphate and silicate), total nutrients (nitrogen and phosphorus), chlorophyll a and total suspended solids. Surface spatial distributions of field collected data were examined to characterize biochemical and hydrographic conditions of the Gulf of Manfredonia and these results were related with the remote sensing analysis data. Remote sensed data (obtained by Landsat 7 TM and Modis Terra) were processed to obtain maps of chlorophyll a, temperature and optical characteristics of the gulf; these maps were compared to in situ data. From physico-chemical measurements no stratification was observed in the water column except for the south-eastern area. High concentrations of silicate and ammonia were observed in the northern zone of the gulf, while nitrate, phosphate, chlorophyll a and total suspended solids distributions showed higher values in the central coastal zone. These results were confirmed by remote sensing analysis; Modis elaboration showed a distribution with higher concentrations of chlorophyll a near the coast and Landsat images highlighted the extension of the surrounding agricultural areas crossed by the two main rivers which discharge into the gulf. The integration between field data with the remote sensing analysis showed to be a valid support in coastal zone management
Caratterizzazione abiotica della Sacca Orientale (zona ZPS) della laguna di Lesina (Sud-Est Italia)
No full textState of knowledge of the trophic state of worldwide lagoon ecosystems: leading fields and perspectives
No full textVariazioni spazio-temporali del comportamento bentonico e potenziale effetto dell'habitat sedimentario sulla zonizzazione biotica: il caso della laguna di Lesina
No full textRecent changes of macrophytes dominances and distributions related to different typology of human-induced stress in a meso-eutrophic lagoon (Orbetello, Italy).
No full textOil Extraction from Macrophytes: Effect of Environmental Factors on Efficiency and Oil Quality in Coastal Lagoon
No full textMacrophytes represent interesting matrices for oil extraction with biodiesel production purposes, particularly in eutrophic coastal lagoons. This short note reported results on bio-oil extraction efficiency in two different species of macrophytes in a Mediterranean lagoon (Lesina lagoon, south-eastern Italy), by testing effects of different factors (year, season, species of macrophytes) on oil production and oil quality. Extracted total oils values ranged from 0.65 % (Chara spp.) to 2.35 % (Chaetomorpha linum) and a significant difference (p < 0.01) between the two species was reported in relation to the variability of diene production with seasons. Compared to the available literature, higher oil extraction efficiencies are reported in this paper for the species C. linum, mainly due to the pressure optimization before extractions
First record of sinanodonta woodiana (Lea, 1834) in an artificial reservoir in the molise region, Southeast Italy
Full text linkThe occurrence of the Chinese pond mussel Sinanodonta woodiana is reported for the first time in the Molise region (Southeast Italy). Details of the mussel’s invasion history in Italy are also given. A total of 24 S. woodiana specimens were collected after a long drought period in October 2017 from an emerged beach on the southwest side of the Guardialfiera artificial lake and their main morphometric features were quantified. No young individuals were found, only large adults, whose survival could ensure population subsistence in more suitable environmental conditions. The present study provides evidence of a massive die-off affecting invasive bivalves during an extreme climatic event, producing decaying biomass with negative impacts on the water quality of the lake. Further investigations of the population dynamics of this species and the environmental quality of the water body are needed to develop an appropriate management plan in relation to the ecosystem services it delivers
Geochemistry and particle size of surface sediments from the Gulf of Manfredonia (southern Adriatic Sea).
No full text- …
