1,721,006 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
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
Comportamento di caccia e selezione dell'habitat del maschio di gheppio (_Falco tinnunculus_) nidificante in un'area della Pianura Padana.
No full textIl gheppio è una specie con cure biparentali, in cui le capacità di caccia del maschio sono determinanti per il buon esito della nidificazione. Lo scopo di questo studio è stato di analizzare il comportamento di caccia del maschio durante il periodo riproduttivo. Poiché non esisteva alcuna informazione relativa all’ecologia del comportamento di caccia della specie nel territorio considerato, è stato necessario studiare la dieta della popolazione, nonché analizzare in che modo venisse utilizzato l’habitat in relazione alle fasi di ricerca del cibo e in relazione alle predazioni avvenute. Per quanto riguarda questo aspetto, si è previsto che se l’area di studio avesse presentato un habitat che offriva una disponibilità maggiore di prede questo sarebbe stato scelto. Altrimenti, tutti gli habitat sarebbero stati utilizzati casualmente. Si è cercato, inoltre, di evidenziare la relazione tra il comportamento di caccia, le caratteristiche dell’area familiare e il numero di prede portate al nido dal maschio. Il comportamento di caccia è stato studiato seguendo i maschi muniti di radiotrasmittenti durante gli spostamenti nella loro area familiare. Ogni modulo comportamentale è stato registrato in relazione al tipo di habitat in cui veniva osservato. E’ stato rilevato che i gheppi non hanno utilizzato casualmente tutti gli habitat idonei per la caccia, ma hanno dimostrato una netta preferenza per il prato. Inoltre, i rendimenti di tutti i tipi di caccia sono stati maggiori nel prato. Nell’incolto, un habitat in cui la vegetazione permanente poteva raggiungere un’altezza che rendeva difficile la localizzazione delle prede, il gheppio ha utilizzato la tipologia di caccia meno dispendiosa, ottimizzando i costi relativi alla ricerca delle prede. La disponibilità trofica dell’area familiare è risultata essere correlata con il successo riproduttivo dei maschi, così come il rendimento della caccia attiva. Poiché non si è trovata alcuna relazione tra la disponibilità trofica e le prede portate al nido, è probabile che questi risultati non rispecchino un rapporto causale tra i parametri, ma dipendano dalla qualità del maschio
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
