1,720,988 research outputs found
Shell shape and size variation in the Egyptian tortoise Testudo kleinmanni (Testudinidae, Testudines)
No full textGrowth, mortality and longevity of the Egyptian tortoise Testudo kleinmanni Lortet, 1883
No full text
The reproductive strategy in temporary ponds: a study case with the Italian endemic Apennine yellow-bellied toad (Bombina pachypus)
No full textAmphibians are declining worldwide and many species are threatened for unknown reasons. In fact, information
on ecology of several species are not available due to the lack of studies. The Apennine yellow-bellied toad (Bombina
pachypus) is an Italian endemic species in progressive decline in many areas, often for unclear reasons. A two-year study
of 116 temporary ponds in a grazing area of the Majella National Park (central Italy) from 2001 to 2002 revealed that:
(a) Apennine yellow-bellied toads reproduced in small ponds characterized by high desiccation risk; (b) breeding activity
occurred for a prolonged period (at least from May to the beginning of August), during which females spawned clutches of very few eggs in several, successive events; (c) the reproductive success was very low especially because of high egg mortality; and (d) the main cause of mortality was the desiccation of ponds. Consequently, the characteristics of breeding
areas (i.e., small, ephemeral ponds) are the most important feature influencing the reproduction. The safeguard of temporary
ponds is crucial for the conservation of this amphibian and could preserve also the other species using these pools
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
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