1,720,974 research outputs found
Effects of global climate change on terrestrial small mammals communities in Italy.
No full textIn the framework of climate change, it has been predicted that the Mediterranean Basin will experience the greatest loss of biodiversity, because it will be heavily affected by several drivers of change. In particular, Italy is an important geographical area because it represents a key hotspot of biodiversity. The aim of this study was to evaluate the effects of global climate chan-e on terrestrial small mammals (Rodents and Soricomorphs) in Italy. Barn owl (Tyto alba) pellet analysis was applied to study the temporal variations of microteriocoenoses structure. We revisited 21 roosting, sites which had been previously studied by other authors and we carried out a similar study in order to analyse possible changes in small mammal communities. Analyses covered a period of about 30 years and the gap between the first and second sampling ranges from I I to 33 years. Collecting localities were grouped according to the Bioclimatic Map of Italy. Several ecological indexes were applied and their changes through time were analysed for each Bioclimatic Region. Results show a significant increase in thermoxerophilic species in the last thirty years, particularly in the Mediterranean Region. This observed rise is likely due to global and local warming. In fact, higher temperatures, lower precipitation and increasing xerothermic conditions could have facilitated the spread of thermoxerophilic species. The persistence of such a trend could lead to a series of serious ecological consequences in the future, including a possible reduction in biodiversity
Utilizzo degli indicatori biologici ed ecologici per lo studio dei cambiamenti climatici.
No full text
Assessing climatic influences on rodent density: a neural network modelling approach and a case study in central Italy
No full textIn a climate change regime (observed in the past and forecasted for the future), it becomes more and more important to assess the role of the climatic environment in influencing the density of some species of interest. In this paper, using density data from Capture-Mark-Recapture (CMR) of Yellow-necked mouse (Apodemus flavicollis), we perform non-linear analyses and apply a neural network (NN) model (conceived for recognising links in complex systems) in order to establish which climatic parameters represent the driving forcings of rodent density in Central Italy. We discover direct ad indirect climatic effects on this variable and, finally, a satisfying reconstruction of Yellow-necked mouse densities over the last 20 years is achieved by a NN model. A further “hindcast” in the past (back to 1965) is performed by the model trained on a recent period and clear trends can be recognised in the record of reconstructed densities
«A scuola nessuno è straniero» . Una riflessione su educazione, cittadinanza e inclusione
No full textIl contributo inizia con una “fotografia” dei profondi cambiamenti che hanno interessato la scuola italiana a seguito dei flussi migratori degli ultimi decenni, per poi soffermarsi sulle scelte politiche e pedagogiche fatte in risposta a questi fenomeni. Viene illustrata quella che il nostro Ministero della Pubblica Istruzione ha definito, nel 2007, “la via italiana per la scuola multiculturale e l’integrazione degli studenti stranieri” che assume la diversità come paradigma dell’identità stessa della scuola e come occasione per aprire l’intero sistema a tutte le differenze. La scuola può contribuire moltissimo alla creazione di una società aperta alle differenze culturali, ma non bastano le politiche educative per favorire una reale integrazione degli immigrati nella società. La riflessione sulla scuola viene quindi collegata a quella sulla legge di cittadinanza. La maggioranza degli studenti stranieri nelle nostre scuole sono immigrati “di seconda generazione”, nati e cresciuti nel nostro Paese, ma non cittadini italiani. La mancata approvazione della legge 2092/2015 sullo ius soli denota forti contraddizioni nel nostro modo di pensare la dimensione interculturale, oltre a creare un vuoto allarmante nelle nostre politiche per l’integrazione
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
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
