1,721,149 research outputs found
What can historical floristic data tell us? A case study from Sardinia (Italy)
No full textThe interest in historical floristic data has been increasing during recent years because of their potential to give insight covering historical periods for which few other data are available. The recent discovery of a historical flora referred to an area of Sardinia (Italy) named Sassarese, for which a relatively updated flora was known, was an opportunity to verify the potentiality of historical data and to provide information for interpreting biodiversity history identifying possible shifts in the flora related to land use changes. Comparing the two floras, we found that 60% of segetal/crop relative species and 20% of freshwater habitat species disappeared and that the introduction of seven alien species has to be dated back. The trends detected may be helpful for future management choices, which should consider the possibility of recovering habitats and activities that encourage the return of disappeared species, perhaps even thinking about restoration projects
Which perspectives for Mediterranean temporary ponds in the European Union in the third millennium?
No full textMediterranean Temporary Ponds (MTPs) are among the most precious habitats in the Mediterranean bioclimatic because they shelter extremely rare and isolated organisms from different taxa and are included in Annex 1 of the Habitat Directive under code 3170*. Nevertheless, their conservation is highly precarious to such an extent to be considered a disappearing ecosystem. To evaluate the perspectives of MTPs in the third millennium, we carried out a literature search, getting on the trail of the string “Mediterranean Temporary Ponds” to answer the following questions: is the focus of these research papers on MTPs sensu Habitat Directive? Do the research areas of investigation mirror the habitat distribution? Which are the main gaps in the issues analysed? Are all the components of the system considered? Our results highlighted the great interest of the scientific community in MTPs. However, it also brought out several problems and knowledge gaps related to the different features analysed: in many cases in which code 3170* is reported, it is just mentioned; the geographical distribution of the studied areas revealed gaps, particularly in the east Mediterranean and throughout the biogeographic regions; among the issues analysed a dearth of research papers related to the identification of the habitat and effects of climate change has emerged; the studies on the biotic components are strongly unbalanced on vascular plants and abiotic components, such as hydrology and water quality, are scarcely investigated. We believe that great efforts should be made to improve practical conservation actions for this habitat in the medium and long term
Vegetazione e paesaggio vegetale dell’arcipelago di La Maddalena (Sardegna nord-orientale).
No full textMonete romane dalla collezione Aste di Cagliari
No full textLo studio si inquadra nell'ambito dell'attività di catalogazione svolta su incarico della Soprintendenza Archeologica. La collezione comprende un ricco repertorio di monete romane di età repubblicana e imperial
Achille Costa (1823-1898), entomologo naturalista esploratore, e i suoi viaggi in Sardegna
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Analisi geobotaniche integrate per l'elaborazione del Piano di gestione naturalistica del parco del Conero.
No full textLarge scale grazing systems for biodiversity conservation
No full textLarge Scale Grazing Systems (LSGS) are complex structures emerging from the interaction of pastoral activities and natural resources. Man-made and nature laws are intertwined in systems of grassland management to produce large-scale effects. LSGS actually harbour a significant part of European natural values, but also include a small part of the rural population striving to make a living under harsh environmental and social conditions. This paper provides a synthesis of lessons learned from a wider research conducted with Greek and Spanish partners (Caballero et al., 2009) aimed at responding to what is left behind under current trend of grasslands abandonment. We have dealt with identification, analysis and diagnosis, but not with prescription. Our main argument is that extensive grazing is congenial with natural values of grasslands, but is the former that gives way to the latter. This assumption was tested for the main Italian LSGS throughout the identification of Successional Trajectories and Target Vegetation types. We detected general patterns of shrubby overgrowth on grazing cessation, increasing species richness with extensive grazing and plant species adapted to grazing or post-grazing succession. The relationship between grazing and biodiversity was not univocal, and spatial and temporal management of grasslands play a major role. It must be stressed the importance of adequate knowledge of the specific impacts of grazing regimes (temporality and grazing intensity) on species and habitat. LSGS face some common threats from intensification in the lowlands to abandonment in the far-reaching and less favoured grassland surfaces. Harsh conditions, social fragility, lacks of assurance of family business turn over, and poor economic performance, are common drivers of change, under a global setting of economic development. However, differential diagnosis of these constraints and alternative management practices at the regional level are further required in devising and implementing desirable grassland management plans and policy frameworks
Disentangling the concept of Junco capitati-Isoëtetum histricis Br.-Bl. 1936
No full textThe association Junco capitati-Isoëtetum histricis Braun-Blanquet 1936 was described in North-Western Tunisia. During the almost one hundred years after the its typification, the name of this association was applied to plant communities of several different localities in Europe (Portugal, Spain, Italy and Crete Island) and North-Africa. The aim of this research was to verify whether the application of this name have drifted the original idea. We collected 110 phytosociological relevès and processed them basing on semi-supervised fuzzy classification and indirect gradient (chorological) analysis. A clear floristic and chorological pattern, with East-Western variations, emerged from the analysis. We disentangled the concept of Junco capitati-Isoëtetum histricis identifying among the communities referred to this name three new associations, Junco sorrentinii-Isoëtetum histricis, Sileno laetae-Isoëtetum histricis, Isoëtetum siculae-histricis, and different subassociations
Gestione sostenibile dei boschi cedui nel sud Europa: indicazioni per il futuro dall’eredità di prove sperimentali
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