1,721,056 research outputs found
Assessment of the current status and effectiveness of area-based conservation measures banning trawling activities in the Adriatic Sea
Full text linkThe marine environment is highly stressed by anthropogenic pressures, among which fisheries, and in particular bottom trawling, are one of the main sources of impact. Area-based conservation measures can help conserve and restore ecosystems and population structures and therefore constitute a key tool to the achievement of the 14th Sustainable Development Goal, preservation of the ocean. The purpose of this paper is to provide an assessment of the compliance of area-based conservation measures. The Adriatic Sea has been selected as a case study area, as one of the most intensively trawled areas in the world where different countries share its resources and consequently different management strategies are put in place. We present a review of the marine managed areas established in the Adriatic Sea in 2019, providing information on their characteristics, temporal variabilities, and scopes. Through the processing of Automatic Identification System (AIS) data, the monthly bottom fishing activity performed within each area was inferred and the intensity was assessed. Thus, the effectiveness of trawling bans was evaluated. We demonstrated that full respect of the prohibition was effective in 73% of the areas, while trawling activity was recorded with different intensities in 149 out of 549 managed areas
Trigloporus lastoviza. In: Sartor P., Mannini A., Carlucci R., Massaro E., Queirolo S., Sabatini A., Scarcella G.
No full textFew data are available on Trigloporus lastoviza biological cycle characteristics in the Italian seas. Trigloporus lastoviza, streaked gurnard, morphology, ecology, diet, biology, growth, sexual maturity and reproduction, recruitment, evaluation, stock assessment. Females reach larher sizes than males in middle-northern Adriatic Sea and in other areas. In the Adriatic Sea, it is reported a size between 11 and 26 cm TL with a main cohort at 16 cm TL. The estimated maximum age is of 5 years for both males and females; 6 and 8 years for males and females respectively in the Greek Aegean Sea; 6 and 5 years in the Turkish Aegean Sea 4 and 5 years in the Tunisian Aegean Sea.
From a comparison between the regression parameters of the length-weigth relationship in different areas, there is evidence of an an increase of b values with latitude, from North to South. In the Italian seas, T. lastoviza spawns in summer. In the Greek Aegean Sea reproduction occurs between winter and early spring. In the Gulf of Tunis, gonadal maturation occurs from September to December and spawning takes place from late December to January for both sexes. In the middle-northern Adriatic Sea, streaked gurnard recruits (<11 cm TL estimated according to Bhattacharya’s method, 1967) ) were found mainly along the North-eastern coast; the area showing the highest persistence in time of recruits was identified off the the Pag Island. A decrease in the number of recruits was observed with time, with a mean value of 4 recruits per km2
Chelidonichthys cuculus. In: Sartor P., Mannini A., Carlucci R., Massaro E., Queirolo S., Sabatini A., Scarcella G.
No full textThe Chelidonichthys cuculus biology is little known inMediterranean Sea and especially in the Italian seas. In Italian seas, reproduction takes place from January to June. In the Adriatic Sea males attain sexual maturity at smaller sizes than females: about 50% of males were mature at 15.0 cm TL and 50% of females were mature at 16.5 cm TL. The size at first sexual maturity for females in the Tyrrhenian is slightly greater of that of other areas. The Maximum length reached by this species is around 45 cm TL. In the Northcentral Adriatic Sea, a maximum length of 30 cm TL was reported. The area showing the greatest persistence of recruits was detected North of Pomo/Jabuka Pit, at a depth range between 100 and 200 m. The data relating to biomass and density evaluation refer to average catch indexes found during MEDITS trawl surveys since 1994 to 2013. The highest densities were observed in the waters of Sardinia, while lower densities were observed in the North-central Adriatic Sea and in the southern Tyrrhenian Sea
Laura Thermes. Progetti per il Sud. L'area Metropolitana dello Stretto
No full textProgetti per il sud. Tesi di laure
Laura Thermes.Progetti per il Sud. Centonove tesi di laurea in progettazione architettonica e urbana.1990-2005
No full textProgetti urbani Tesi di laurea di Laura Therme
Estimating hidden fishing activity hotspots from vessel transmitted data
Full text linkMonitoring fishery activity is essential for resource planning and guaranteeing fisheries sustainability. Large fishing vessels constantly and continuously communicate their positions via Automatic Identification System (AIS) or Vessel Monitoring Systems (VMSs). These systems can use radio or Global Positioning System (GPS) devices to transmit data. Processing and integrating these big data with other fisheries data allows for exploring the relations between socio-economic and ecosystem assets in marine areas, which is fundamental in fishery monitoring. In this context, estimating actual fishing activity from time series of AIS and VMS data would enhance the correct identification of fishing activity patterns and help assess regulations' effectiveness. However, these data might contain gaps because of technical issues such as limited coverage of the terrestrial receivers or saturated transmission bands. Other sources of data gaps are adverse meteorological conditions and voluntary switch-offs. Gaps may also include hidden (unreported) fishing activity whose quantification would improve actual fishing activity estimation. This paper presents a workflow for AIS/VMS big-data analysis that estimates potential unreported fishing activity hotspots in a marine area. The workflow uses a statistical spatial analysis over vessel speeds and coordinates and a multi-source data integration approach that can work on multiple areas and multiple analysis scales. Specifically, it (i) estimates fishing activity locations and rebuilds data gaps, (ii) estimates the potential unreported fishing hour distribution and the unreported-over-total ratio of fishing hours at a 0.01 degrees spatial resolution, (iii) identifies potential unreported fishing activity hotspots, (iv) extracts the stocks involved in these hotspots (using global-scale repositories of stock and species observation data) and raises an alert about their possible endangered, threatened, and protected (ETP) status. The workflow is also a free-to-use Web Service running on an open science-compliant cloud computing platform with a Web Processing Service (WPS) standard interface, allowing efficient big data processing. As a study case, we focussed on the Adriatic Sea. We reconstructed the monthly reported and potential unreported trawling activity in 2019, using terrestrial AIS data with a 5-min sampling period, containing similar to 50 million records transmitted by similar to 1,600 vessels. The results highlight that the unreported fishing activity hotspots especially impacted Italian coasts and some forbidden and protected areas. The potential unreported activity involved 33 stocks, four of which were ETP species in the basin. The extracted information agreed with expert studies, and the estimated trawling patterns agreed with those produced by the Global Fishing Watch
Sotto il ponte. Villa San Giovanni - Dalla base dei tiranti al Centro Direzionale
No full textSintesi sul progetto realizzato in occasione del LId'A 8 Laboratorio Internazionale d'Architettura 8° edizion
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Parco Agricolo del Gugliotta a Piano Tavola,Carini.Nuove relazioni tra tessuto urbano e tessuto agricolo
No full textProgetto per Carini Ricerca PRIN MIUR UNIP
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