101,921 research outputs found
Indagine sulle conoscenze matematiche delle matricole di corsi di laurea in materie scientifiche
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Statistica e Probabilità nel biennio: nodi culturali e didattici da affrontare - parte I
No full textStatistica e Probabilità nel biennio: nodi culturali e didattici da affrontare - parte II
No full textStructure and Functionality of the Mesozooplankton Community in a Coastal Marine Environment: Portofino Marine Protected Area (Liguria)
No full textThis research is part of the LTER (Long-Term Ecological Research) project, a network of terrestrial, freshwater, transitional water and marine sites, on which ecological research is conducted on a multi-decade scale. LTER studies ecosystems, their dynamics and evolution, the relationships between biodiversity and ecological functionality, water quality, productivity, the role of resource availability, the effects of pollution and climate change. The research focuses on the study of the variability of zooplankton groups in the Portofino marine protected area, in Punta Faro. The samplings were carried out in the years 2018–2019, and the results were compared with the values of the years 2003–2005, interesting from a meteorological climatic and biological point of view. The plankton community of the Punta Faro system was analyzed by means of a modeling approach to obtain information on the functionality and health status of the system and to verify whether this has undergone any alterations in the last decade. The analyses carried out show a clear difference between the three-year period 2003–2005 and the two-year period 2018–2019, highlighting how environmental changes, such as the increase in temperature, have led to higher costs of system functioning in the last two years. The mesozooplankton community has changed both in terms of abundance of organisms and in terms of organization and functionality
Applicazione in GRASS per l’identificazione di aree idonee alla realizzazione di nuovi impianti di itticoltura offshore
No full textLa gestione della fascia costiera è un processo complesso che cerca di integrare lo sfruttamento dell’area con il mantenimento di una buona qualità ambientale. Trattandosi di un problema spaziale complesso può essere ben affrontato mediante strumenti GIS. Questo lavoro presenta un approccio applicato all’itticoltura offshore, sviluppando una procedura con GRASS per l’identificazione delle aree idonee all’installazione di nuovi impianti, applicata al caso della Regione Liguria. La selezione dei siti si è basata sulla definizione di due principali criteri che ne determinano l’idoneità per l’attività proposta (“aree non idonee” e “aree potenzialmente idonee”) e di condizioni concernenti la zona studio. La procedura ha permesso di ottenere la mappa finale con la perimetrazione delle aree idonee, tramite la realizzazione intermedia delle mappe dei criteri. Sono state identificate circa trenta zone idonee lungo la costa ligure, principalmente localizzare a ponente; a levante si trovano quelle di maggiore estensione. La procedura è stata verificata confrontando le aree individuate con la posizione degli impianti già esistenti. I risultati di questo lavoro dimostrano come questa procedura permette di individuare le aree idonee in modo semplice, rapido, efficiente ed efficace. Con opportune modifiche la procedura può essere applicata a qualunque sistema marino costiero e può essere adattata ad altre attività della zona costiera. Questo lavoro è inoltre una solida base per lo sviluppo futuro di un Sistema di Supporto alle Decisioni Spaziali che restituisca scenari alternativi per i portatori di interesse al fine di individuare la migliore scelta decisionale
Cruise tourism: an ecological and economic assessment in the territorial context of Portofino MPA
No full textTourism and cruise tourism in 3 municipalities along the ligurian coast were studied through emergy analysis.
Two municipalities are inside the Portofino MPA. The environmental costs and the economic benefits of tourism
activities were assessed in the local territory. Moreover the load imposed to the environment by cruise ship
tourism was calculated. Similarities and differences among case studies emerged also depending on different
territorial management strategies. Results proved that these activities should be managed integrating them in
the local context to reduce or mitigate their impacts in order to progress towards their sustainable manage-
ment
The economic revenues and the emergy costs of cruise tourism
No full textEmergy analysis was applied to three municipalities (Portofino, Santa Margherita Ligure and Rapallo) of the Liguria Region coast, where tourism and cruise tourism are thriving. The results were compared with traditional economic indices. The territorial assessment of the municipalities was analysed by comparing the environmental costs with the economic benefits, focusing on tourism and cruise tourism. Similarities and differences among the case studies emerged. The three economies resulted as being driven by the tertiary sector, but consequences from the different development strategies came to light. Portofino has developed an elite type of tourism with greater attention devoted to the environment. This is mirrored by a sort of safeguarding of tourism and natural resources and by the detriment of the productive sector's success, on the contrary, in Rapallo. Santa Margherita lies in a boundary condition. The cruise tourism sector was analysed in these contexts. The ecological and economic impacts of the cruise sector were revealed to be significant only in Portofino, being less than 1% in Rapallo and Santa Margherita Ligure. The load imposed on the local environment by cruise ship tourism was calculated, and Portofino showed a limited condition, while Santa Margherita Ligure and Rapallo exceeded the local carrying capacity. This is due to the different management approaches pursued: only in Portofino is the territory more able to absorb the impact, although the limit is currently reached. As a consequence it appears to be evident that such phenomena as cruise tourism, albeit economically promising in the short term, should be managed with a long-term perspective, integrating them into the local context and setting up strategies for impact reduction or mitigatio
Assessment of natural capital and environmental flows distribution: A Mediterranean case study
No full textThe coastal marine area hosts among the most productive ecosystems in the world, in terms of biomass and species richness. These ecosystems' natural capital stocks provide essential flows of resources for the environ-ment and human life. The distribution of natural capital (NC) and environmental flows (ENFL) characterizing the coastal marine habitats of Ligurian Sea, a biodiversity hotspot in the Mediterranean region, were assessed to define their current state. The study area was divided into 43 functional spatial sections, defined as "biomarine units". In each biomarine unit natural capital and environmental flows were estimated using data on benthic and fish biomass. Emergy analysis, a thermodynamics-based methodology that expresses the costs in terms of re-sources incurred by nature to maintain the ecological processes of the marine coastal habitats, was then applied to assess the natural capital and the environmental flows in biophysical terms (solar emergy joules, sej), and using appropriate conversion factors, in monetary terms (emergy euro, emeuro). The monetary equivalents facilitate understanding for stakeholders and pave the way for the inclusion of marine resources value in socioeconomic and political contexts. The total value of natural capital for the Ligurian coastal and marine area is 2.11 billion emeuro, while for environmental flows, it is 1.43 billion emeuro a-1. Greater values belong to units included within the boundaries of protected areas, proving the efficiency of the protection measures taken. These values represent a reference point and shall be kept constant to preserve natural capital and to ensure services provisioning at least at the current level. This work identify a method useful to monitor the status of natural capital value and environmental flows along Ligurian coast, which can be helpful to stakeholders and policymakers for better monitoring and management of the area
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