1,721,021 research outputs found
HAS THE RECOLONIZATION OF THE PO PLAIN BEGUN? UPDATES REGARDING THE PRESENCE OF THE EURASIAN OTTER (Lutra lutra) IN NORTH-EASTERN ITALY
Full text linkWidespread in Italy in the early 1900s, the Eurasian otter subsequently underwent
a dramatic decline that led to its local extinction in many administrative regions, with the exception of a small residual nucleus in southern Italy. For a few years now, the Austrian and Slovenian populations adjacent to north-eastern Italy have been increasing sharply, leading to a recolonization of the area by the species. During 2020, in Friuli Venezia Giulia, surveys of signs of presence were carried out in 48 grid cells (10 x 10 km) to update information on the species’ local distribution. The following monitoring methods were used: monitoring beneath bridges combined with transects along water courses. 17 grid cells tested positive for the presence of the species, and currently, the otter appears widely distributed in Friuli Venezia Giulia along the main waterways of the Eastern Alps and Prealps, and in some areas overlooking the plain of the Tagliamento and the transborder Isonzo-Soča basin, both included in the Po plain. These constitute the first observations of the species for more than 50 years. Compared to previous studies, 13 new grid cells involving the presence of otters were identified, including in lowland areas, suggesting a progressive expansion from the mountain ranges towards the Po-Venetian Plain. This represents, a spur to expand research
and implement new studies to improve levels of knowledge about and the consequent protection of the species. Finally, the integration of transects along riverbanks to monitoring beneath bridges, allowed us both to collect numerous observation and to compare our results with previous studies
La pernice bianca Lagopus mutus helveticus (Thienemann, 1829) nel Parco Naturale delle Prealpi Giulie: stime della distribuzione e della consistenza della popolazione
No full textAbstract - In this study we report the results relevant to monitoring of ptarmigans Lagopus mutus helveticus (Thienemann, 1829) in the Julian Prealps Natural Park. The data we have collected have allowed us to establish their distribution, evaluate the extent of their presence and locate the areas whitin the Park which have the most significant role for conservation purposes. We also report some environmental information about the locations selected by ptarmigans. The species is present in the eastern part of the area, though unevenly; we estimate the presence of 16 (11-18) territorial males in spring; in our study area the density of territorial males was 1,83/Km2. We did not spot any territorial males below 1900 metres a.s.l.. A suitability model was generated using distribution data, in order to develop a potential distribution of suitable area for the species within the Park. The eastern portion of the protected area proves to be more relevant to the conservation of the species
Energy Densities of Brown Trout (Salmo trutta) and Its Main Prey Items in an Alpine Stream of the Slizza Basin (Northwest Italy)
No full textStatus of marble trout (Salmo marmoratus Cuvier, 1829) populations in freshwater environments of Friuli Venezia Giulia
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
Distribution and biology of Aphanius fasciatus (Actinopterygii, Cyprinodontidae) in the Isonzo river mouth (Friuli Venezia Giulia, Northeast Italy)
Full text linkThe aim of the study is to investigate Aphanius fasciatus biology in the northern section of its distribution
area. Within the Natural Regional Reserve of the Isonzo River Mouth, 8 sampling sites were monitored
between late spring (May) and autumn (November) in 2015 and 2016: 257 specimens were collected, and
five age classes were determined by scale reading (0+ to 4+). No significant differences were observed for
total length and weight between sexes. Sex ratio was 2.37 and favored females. Seven meristic characters
were analyzed on 60 specimens found dead: values showed no significant differences between sexes, except
for the number of vertical flank bars in 0+ and 1+ age classes. The gonadosomatic index was analyzed on 33
specimens, showing maximum values in June for females (11.44%) and in July for males (5.74%). Values
decrease over following months and reaching a minimum in late August for females (0.42%); no data were
available for males in August. Histological analyses suggest that A. fasciatus is a multiple serial spawner: the
reproductive period starts in June, while the first recruitment phase occurs in August. Female gonads showed
asynchronous development, with germinal cells at each maturation stage, but no dominant phases were
observed
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