1,721,083 research outputs found
Strategies for monitoring and conservation of troglobitic endemic fauna in some subterranean sites od Sardinia
No full textFrom the biogeographic and biospeleological points of view, the subterranean fauna
of Sardinia is one of the most interesting in the Mediterranean area: very rich in taxa,
mostly endemic and highly specialised, it is apparently well known and currently
investigated. Nevertheless, the amount of unexpected discoveries is still increasing
every year.
In the present thesis, at first, owing to the general low interest of the public for the
protection of invertebrate endemic, troglobitic organisms, we have selected among
the endemic vertebrate species protected by European, national and regional laws,
those that should be helpful - as “Umbrella Species” – for the conservation of this
very important natural heritage. The choice of the genus Speleomantes (Amphibia,
Plethodontidae) showed how many endemic organisms could be protected with the
conservation of the karst areas where these Amphibians are present (in particular, in
Sulcis-Iglesiente and Nuorese areas).
The second phase consisted in the study of larval morphology and natural history of
some species of troglobitic beetles. Their larvae, in fact, seem to be much more
vulnerable than adults to the anthropogenic impact in caves.
Finally, the yearly temperature variations in Bue Marino cave (Dorgali, Eastern
Sardinia), the most visited show cave in Sardinia, have been monitored with the aim
of increasing our knowledge of the touristic impact on subterranean animal species.
During the samplings in the field, several troglobitic organisms, new for the Science,
or never previously reported from some caves, have been discovered and in part
described, showing how scarce is our knowledge of the subterranean Biodiversity in
the island, compared with the real potential of the Sardinian karst
Two new Typhloreicheia species from Sardinia and their biogeographical significance (Coleoptera, Carabidae, Scaritinae)
Full text linkVolume: 134Start Page: 15End Page: 3
Typhloreicheia grafittii, nuova specie della Sardegna centro-orientale (Coleoptera, Carabidae)
No full text
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
TYPHLOREICHEIA FLAVIAE N. SP. DELLA SARDEGNA CENTRO-ORIENTALE, E NOTE AGGIUNTIVE SULLA DISTRIBUZIONE DI TYPHLOREICHEIA BULIRSCHI MAGRINI & BASTIANINI, 2011 (Coleoptera, Carabidae)
No full text"Nella presente nota è descritta Typhloreicheia flaviae n. sp., scoperta nella Grotta. di Istirzili N° 50 Sa\/NU, 507 m s.l.m. (Sardegna centro-orientale, Supramonte di Baunei,. Ogliastra). La nuova specie è affine a T. casalei Magrini, Marcia & Onnis, 2011, nota di. una grotta del Supramonte di Urzulei, ma se ne differenzia per numerosi caratteri indicati. nel testo e illustrati nelle figure; in particolare: dimensioni nettamente minori, corpo più. depresso, tegumenti meno lucidi, pronoto più ristretto alla base, lobo mediano dell’edeago. con apice più appuntito in visione laterale e meno inclinato ventralmente, in visione ventrale. più dritto e simmetrico, lamella copulatrice con apice conformato diversamente. La. nuova specie non presenta caratteri adattativi alla vita ipogea particolarmente evidenti, ma. è complessivamente simile ad altri taxa, endogei o tipici dell’MSS, reperiti recentemente. in cavità della Sardegna orientale e meridionale: T. carlonnisi Magrini, Marcia & Casale,. 2011, T. casalei Magrini, Marcia & Onnis, 2011 e T. grafittii Magrini, Onnis, Casale &. Marcia, 2012. Sono inoltre riportate alcune note addizionali sulla distribuzione di Typhloreicheia. bulirschi Magrini & Bastianini, 2011 nella Sardegna meridionale.
Sardinia, a hotspot of diversity for subterranean terrestrial isopods (Crustacea, Oniscidea)
No full textMorphology and phylogeny of the subterranean genera Alpioniscus and Utopioniscus from Sardinia, Italy (Crustacea, Oniscidea, Trichoniscidae)
No full text- …
