1,721,068 research outputs found
The family Olibrinidae in Italy (Malacostraca, Isopoda, Oniscidea)
Full text linkAmong the Oniscidea, the family Olibrinidae is still poorly known and was not yet recorded from Italy. The genus Castellanethes Brian, 1952, previously included in the family Trichoniscidae, is transferred to the family Olibrinidae, representing the first record of this family for Italy. Castellanethes sanfilippoi Brian, 1952 is redescribed from specimens collected in a cave in Apulia, Italy, close to the type locality. The genus Adoniscus Vandel, 1955 is considered to be a junior synonym of Castellanethes. Castellanethes soloisensis (Vandel, 1959) from Morocco is also figured. A diagnosis of the genus, key to species and distribution map are given
Faunistics and biogeography of terrestrial isopods (Crustacea, Oniscidea) from Liguria, north-western Italy.
No full textThe aim of this contribution is to illustrate the current state of knowledge of the Ligurian oniscidean fauna. Information from literature data and from material collected and examined in recent years are compared. Prior the start of our research in 2017, the total number of species recorded for Liguria was 73, belonging to 29 genera and 12 families. Most of these species were described or reported in a rather large number of papers on this topic published in the first half of the 20th century. From the ‘60s onwards, however, studies concerning terrestrial isopods from this region have considerably decreased, despite the large amount of undetermined material collected over the years and deposited in the scientific collections of several museums. The examination of both preserved and newly collected material has raised the number of species to 103, belonging to 38 genera and 17 families. Among these, it is worth to point out the presence of six species new to science, currently under description. Considering the limited territorial extension of Liguria (5,418 km2), 103 is a rather conspicuous number of species. For comparison, 78 species are recorded for Corsica (8,680 km2), 94 for Sardinia and surrounding islands (24,100 km2), 103 for Sicily and surrounding islands, including the Maltese Archipelago (26,148 km2), and 131 for Tuscany (22,943 km2). Moreover, as some areas or environments of the region have not been adequately investigated yet, such a sum is likely to increase. Such species richness, noticeable not only in terrestrial isopods, is probably due to the great environmental variability, the geographic position, and the geological context of Liguria, which is known to represent a significant biogeographic crossroad
Evaluating the correlation between area, environmental heterogeneity, and species richness using terrestrial isopods (Oniscidea) from the Pontine Islands (West Mediterranean)
Full text linkArea and environmental heterogeneity influence species richness in islands. Whether area or environmental heterogeneity is more relevant in determining species richness is a central issue in island biogeography. Several models have been proposed, addressing the issue, and they can be reconducted to three main hypotheses developed to explain the species-area relationship: (1) the area-per se hypothesis (known also as the extinction-colonisation equilibrium), (2) the random placement (passive sampling), and the (3) environmental heterogeneity (habitat diversity). In this paper, considering also the possible influence of geographic distance on island species richness, we explore the correlation between area, environmental heterogeneity, and species richness by using faunistic data of Oniscidea inhabiting the Pontine Islands, a group of five small volcanic islands and several islets in the Tyrrhenian Sea, located about 60 km from the Italian mainland. We found that the colonisation of large Pontine Islands may occur via processes independent of geographic distance which could instead be an important factor at a much smaller scale. Such processes may be driven by a combination of anthropogenic influences and natural events. Even in very small-size island systems, environmental heterogeneity mostly contributes to species richness. Environmental heterogeneity could influence the taxocenosis structure and, ultimately, the number of species of Oniscidea via direct and indirect effects, these last mediated by area which may or may not have a direct effect on species richness
Insights into the late-Sixties taxocenosis of Oniscidea from the Pontine islands (West Mediterranean) (Peracarida: Isopoda)
Full text linkWe report and discuss faunistic data of Oniscidea inhabiting the Pontine islands, a group of five small volcanic islands and several islets in the Tyrrhenian Sea, located about 60 km from the Italian mainland. Data here presented were primarily obtained from the examination of the material collected during a three-year (1965-1968) research program supported by the Italian National Council of Research and aimed at investigating Mediterranean small island faunas, including Oniscidea. Despite the sampling was not specifically directed at Oniscidea, these data may provide insights into the structure of the Oniscidean taxocenosis of the islands as it existed fifty years ago. Thirty-five species belonging to 11 families, 8 ecological and 7 biogeographical classes were found on these islands. Such number of species of Oniscidea is very high, if we consider the low number of islands and their small sizes. Changes in climate and environmental conditions occurred in the last fifty years would call for a new investigation
New species and records of the family Scleropactidae Verhoeff, 1938 from Venezuela (Crustacea, Isopoda, Oniscidea)
Full text linkEight species in the family Scleropactidae are recorded from Venezuela. Three species are described as new: Colomboscia venezuelana n. sp. from the departments of Aragua and Miranda, Globopactes cristalinae n. sp. from the department of Trujillo, and Globopactes mucuyensis n. sp. from the department of Merida. Globopactes senex and Neosanfilippia venezuelana have their distribution extended to the departments of Aragua and Carabobo, respectively
Morphology and phylogeny of the subterranean genera Alpioniscus and Utopioniscus from Sardinia, Italy (Crustacea, Oniscidea, Trichoniscidae)
No full textSardinia, a hotspot of diversity for subterranean terrestrial isopods (Crustacea, Oniscidea)
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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
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