1,721,038 research outputs found
Particulate organic matter composition in Terra Nova Bay (Ross Sea, Antarctica) during summer 1990
No full textIl sistema di contabilità ambientale delle aree marine protette: l'approccio biofisico
No full textSince 2014, 27 Italian Marine Protected Areas (MPAs) are involved in a national programme
devoted to the development and adoption of an environmental accounting system. The main goal of such a
system is the calculation of the ecological and economic value of the MPAs natural capital and of the
ecosystem functions and services generated. Environmental costs as well as the impacts related to human
activities in the MPAs will be also assessed. Finally, an overall balance and the assessment of net benefits
will be calculated. The outcomes of the project will be managed through an operational Web GIS platform
capable of spreading user-friendly information to local managers, policy makers, and other stakeholders
Relationship between ectoenzymatic activity and availability of organic substrates (Ross Sea, Antarctica): An experimental approach
No full textOrganic matter consumption and decomposition were studied in four experimental systems, having collected different organic substrates in the Ross Sea in December 1994. For the experimental approach selected, processes normally acting on a mixed pool of substances could be separated and the main features of each phenomenon could be focused on. Through the strict relationship between each experimental system and natural conditions shown by organic matter assessment, ectoenzymatic activity trends and their relation with Antarctic water substrates could be described. Through ice melting the water column becomes rich in large pools of substrates, as well as enzyme-producing micro-organisms, capable of quick development. The quantitative predominance of leucine-aminopeptidase throughout the year is well known, but its relative importance seems to decrease when, owing to production events, the environment is enriched with autotrophic- and heterotrophic-derived substances, leading to glycolytic enzymes expression. Thus, ectoenzymatic activity is supposed to be one of the factors responsible for organic matter variations, showing quantitative and qualitative changes depending on substrate availability
Structure 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
Recreational boating in the Portofino Marine Protected Area (MPA), Italy: Characterization and analysis in the last decade (2006–2016) and some considerations on management
No full textRecreational boating is a significant nature-based activity, which is especially popular in the Mediterranean region. This study analyses this activity in the last decade in the Portofino MPA, a popular recreational boating area in the Ligurian Region (northwest of the Italian peninsula) in order to evaluate the maximum turnout and to provide management considerations to better achieve conservation and environmental management of a MPA. Monitoring activities were carried out during the summer from 2006 to 2016 and allowed locating the most critical sectors of MPA in consideration of different factors and kinds of boats. From the results of this long-term monitoring, the first conducted in Italy, it is evident that only some anchoring sectors of the Portofino MPA may suffer impacts from recreational boating and that the boats have different spatial and temporal distribution depending on the different summer months, on the public holidays and on weather conditions which mainly affect the boats units < 10 m (73% of the monitored boats). Due to direct impact of the anchorage on the seafloor, which hosts peculiar natural habitats, and the fairly constant presence of the recreational boaters over the years, different solutions for better protect the seabed without excessively prejudicing the enjoyment of recreational boating are discussed. Since the San Fruttuoso seagrass-friendly mooring area is one of the most visited sectors in the MPA, an increase in the number of seagrass-friendly moorings combined with a higher delimitation of the areas with special habitats may represent an optimal strategy
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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