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A New Batillipedidae (Tardigrada, Heterotardigrada) from the Orosei Gulf, Sardinia, Tyrrhenian Sea
No full textnew species of Batillipedidae, Batillipes spinicauda, has been found in subtidal sand sediments collected in Orosei
Gulf (Sardinia, Tyrrhenian Sea). The most important peculiarities of the new species are the shape of the primary
clavae, lateral processes and caudal apparatus. In the same samples, B. littoralis Renaud-Debyser, 1959 and Orzeliscus
belopus Du Bois-Reymond Marcus, 1952 were found
Meiobenthic biodiversity in areas of the Gulf of Taranto (Italy) exposed to high environmental impact
No full textBiological and chemical parameters (meiofauna density and diversity, redox profiles) were investigated in relation
to the environmental conditions of sediments in the Gulf of Taranto. Sediment cores were collected from 42
stations from 5 to 20m depth, in 1995, 2000 and 2001. Meiofauna abundance and diversity were significantly
lower in the Mar Piccolo, the area most heavily polluted by organic loads; in Mar Grande and Chiatona areas
the same parameters showed slightly higher values. Eh profiles revealed anoxic conditions in coastal sediments
impacted by industrial and sewage discharges. Meiofauna density ranged from 186 to 1370 individuals 10 cm 2.
Generally, over 80% of total meiofauna was composed of nematodes; the contribution of other taxa is much less
important. The widespread presence of the lessepsian Chlorophyte Caulerpa racemosa since 1996, seemed to
enhance the abundance of meiofauna, and increased microhabitat complexity, but reduced diversity of some taxa,
such as the meiobenthic crustaceans. Comparing 2001–2002 data with 1995 (before C. racemosa invasion), the
recent decrease of some groups (ostracods, amphipods, isopods, tanaids and cumaceans) was markedly evident. In
conclusion, our findings confirm the chronically degraded environmental conditions in the Gulf of Taranto, and
draw attention to the further contribution of C. racemosa invasion
The diversity of Indian Ocean Heterotardigrada
No full textInformation about Indian Ocean tardigrades is quite scarce and in most cases refers to species in coastal coralline sediment and occasionally in abyssal mud. The present data concern species found in the intertidal sand of Coco and La Digue Islands in the Seychelles, previously unsampled for tardigrades, as well as species in subtidal sediment found at depths ranging between 1 and 60 m off the shores of the Maldive Atolls. These sediments are all very similar and consist of heterogeneous coralline sand, moderately or scarcely sorted. Sixteen species (three new to science) were found in the Seychelles, belonging to Renaudarctidae, Stygarctidae, Halechiniscidae, Batillipedidae and Echiniscoididae. Diversity and evenness data are also interesting, with maximum values of H' = 2.59 and of J = 0.97. In the Maldives 25 species were found (two new to science) belonging to Neostygarctidae, Stygarctidae, Halechiniscidae and Batillipedidae. Such a number of species, despite the low percentage of tardigrade fauna (only 0.6% of the total meiofauna), contributes to the high values of both diversity and evenness, with H' ranging between 1.5 and 2.6 and J between 0.6 and 1. The Indian Ocean tardigrade fauna currently numbers 31 species of Arthrotardigrada and 2 species of Echiniscoidida. In the present study, Arthrotardigrada are the most abundant and all the families are present except Neoarctidae. Halechiniscidae is present with all the sub-families (except Euclavartinae), thus contributing to the high diversity values. Furthermore, 18 species, representing more than 50% of the total marine tardigrade fauna, are new records for the Indian Ocean, including five species new to science
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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