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Fishery with trammel net targeting red mullets in the Livorno artisanal fleet: characterisation of Mullus barbatus and Mullus surmuletus catches
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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
Biological aspects of Medorippe lanata (Linnaeus, 1767) (Brachyura: Dorippidae) from the eastern Ligurian sea (western Mediterranean).
No full textCatch composition and damage incurred to crabs discarted from the eastern Ligurian sea "rapido" trawl fishery
No full textCatch composition and damage incurred to the populations of three crabs (Liocarcinus depurator, Medorippe lanata and Goneplax rhomboides), discarded by the "rapido" trawl fishery of Viareggio (eastern Ligurian Sea), was investigated. Data were collected on a monthly basis (January-December 2001) through embarks on board of a commercial fishing vessel, so as to reflect commercial fishing practice. The three species represented from 7 to 31% of the discarded biomass, varying with season. Density and biomass indices were characterised by a clear seasonality, each species showing a peak in a different period of the year. A six level scale, based on macroscopic external injuries was used to assess the damage sustained by each species after fishing and sorting operations. For the three species, very similar percentages (56-58%) of individuals were macroscopically intact, while inspection of damaged individuals revealed some differences in the distribution of injuries. G. rhomboides showed the highest proportion of serious damage, followed by L. depurator and M. lanata. The severity and frequency of damage was mainly correlated with interspecific and intraspecific (sexual dimorphism) morphological and behavioural characteristics. For example, specimens with longer and thin appendages, like males of G. rhomboides, seemed to be particularly vulnerable to the fishing and sorting operations; this could also explain the positive correlation between damage level and size found in this species. In M. lanata, small individuals proved to be more vulnerable, while for L. depurator no significant correlation was found between damage and size. Although these estimations did not take other injury typologies into account (e.g. internal and physiological damage), these results can be seen as a first indirect estimation of discard mortality for these species and can represent an important term of reference both for similar studies performed in other areas and for the monitoring of this fishery
Catch composition of set nets used by the small-scale fishery of leghorn (Eastern Ligurian Sea)
No full textGillnet efficiency and selectivity in the exploitation of the common sole, Solea Vulgaris (Quensel, 1806)in the estern Ligurian Sea
No full textFishery and biology of mantis shrimp Squilla mantis (L., 1758), exploited with “rapido” trawl in the eastern Ligurian sea.
No full textVariations 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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