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Note sull’accrescimento e sulla riproduzione di Palaemonetes antennarius (H. Milne Edwards, 1837) (Crustacea, Decapoda) nel Fiume Tirso
No full textMorfologia e variabilità intraspecifica nella colonna vertebrale di Spicara smaris L., 1758 (Teleostea, Centracanthidae)
No full textReproductive development versus estimated age and size in a wild Mediterranean population of Octopus vulgaris (Cephalopoda: Octopodidae)
No full textFirst investigation on the relationship between reproductive development and estimated age/size in a wild population of Octopus vulgaris was performed in the Sardinian waters (central western Mediterranean Sea) in order to have a useful tool for integral fishing management in the area. Full sexual maturity was registered from April to August for females with a peak in summer whereas for males it was observed all year round. Size at maturity was 320 g for males (70 mm dorsal mantle length (ML)) and 520 g for females (120 mm ML). From 61 to 465 and from 80 to 390 daily growth increments were counted on the lateral wall of the upper beak, respectively in males and females, obtaining a positive relationship between estimated age and size of the specimens. The sexual maturation was primarily size-dependent with a secondary role played by the age especially in males. The estimated age of 390 and 465 days respectively of the largest female (4661 g) and male (5344 g) as well as that of two males at the end of their lives ('spent') of 310 and 420 days old, have suggested a lifecycle of about 1 year for both genders
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
Preliminary data on the biology of Alepocephalus rostratus Risso, 1820 in the central-western Mediterranean
No full textThis note deals with 107 specimens of Alepocephalus rostratuscaught in the Sardinian Channel at depths between 950 and 1190 m. Its frequency of numerical abundance increased with depth. The standard length (SL) of the specimens caught ranged between 13 and 45 cm for females and 13 and 36 cm for males. The length-weight relationship was TW=0.0063SL 3.113 for sexes combined. The main prey identified in the stomachs were the tunicate Pyrosoma atlanticumas well as crustacean
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
Deep water red coral from the island of Sardinia (north-western Mediterranean): a local example of sustainable management.
No full textSince 1979, red coral harvesting in Sardinia has been regulated by regional laws. The regulations, including a
minimum take size of 10-mm basal diameter, were imposed to limit and control harvesting. Our study indicated that.75%
of the red coral colonies harvested in 2007–08 in the north-western coast were above the legal minimum size for
exploitation. Moreover, extensive surveys with remotely operated vehicles allowed us to document the real structure of
wild populations. Large colonies (.10 mm) represented a big portion of the population (,38% of the total), suggesting
that harvesting effort did not affect yet the maximum size of colonies. All these results seem to be confirmed by the
application of the model of Beverton and Holt. This model shows that the fishery of red coral in Sardinia reaches its
maximum yield at an age at first capture of 20 years, an age significantly lower than the average age of 30 years calculated
for the colonies actually harvested in the Sardinian coast. Our data confirmed that the measures enacted in the Sardinian
regulations provide for an adequate management of this resource and, in addition, can represent a guideline for other
countries that still lack a valid management plan
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