1,720,972 research outputs found
Alien Travel Companies: The Case of Two Sea Slugs and One Bryozoan in the Mediterranean Sea
No full textMediterranean marine fauna is constantly changing due to the entry of non-indigenous (NI) species and the loss of endemic biodiversity. In this framework, it is very important to monitor this constant change and investigate possible new pathways of dispersion. Marinas and ports are considered key stations to detect and study some important ecological aspects, such as NI and invasive species, the effects of climate change, and pollution. Here, we reported the case of a group of NI species that presumably reached the Mediterranean Sea together, each of them being ecologically associated with one another. The bryozoan Amathia verticillate and the sea slugs Favorinus ghanensis and Polycerella emertoni were found in the shallow waters of Fezzano’s marina in the gulf of La Spezia (Ligurian Sea, Mediterranean Sea). Molecular analyses were carried out to exclude cryptic diversity and to investigate the phylogenetic relationships occurring between closely related taxa. The spreading of these two NI sea slugs into the Mediterranean Sea was confirmed and the first record of P. emertoni from the Ligurian Sea reported. These findings shed some light on the poorly known ecology of these species that could be useful for future monitoring and conservation strategies
Is Citizen Science a valid tool for monitoring alien species in Marine Protected Areas?
Full text linkWe report on our experience of NIS monitoring within the Egadi Islands MPA and at Pianosa Island National Park of Tuscan Archipelago through Citizen Science projects The Projects Caea cdacea Egadi Islands and Aliens in the Sea allowed to gather useful information on the distribution and colonisation strategies of NIS and cryptogenic species within the Egadi Islands MPA The project Percorsi nel bluBlue Paths allowed to register the first record of two cryptogenic species, Aa dacea Rang, and Pec gbbe H Milne Edwards, , at Pianosa Island As in MPAs the protection does not hinder the introduction and spreading of NIS, we expect they are likely to continue to arrive and expand in the absence of effective management actions In this respect, Citizen Science activities eg monitoring and surveillance plans, public campaigns raising awareness in tourists and stakeholders certainly could usefully support not only the research on NIS but also their management in MPAs
First record of the invasive crab Percnon gibbesi (H. Milne Edwards) at Pianosa Island: the second goal reached by the innovative Marine Citizen Science Literacy Project PERCORSI NEL BLU (BLUE PATHS)
Full text linkThis study represents the second scientific goal reached by the operating Project Team and the first record of the cryptogenic species Pec gbbe H Milne Edwards, at Pianosa Island October During a Scuba survey, almost specimens of P gbbe were recorded up to a depth of m and analyzed, according to some indicators such as health state, sex, morphology, and parameters such as temperature, covering of algal species, type of rocky bottom This tropical Atlantic grapsid crab is considered as the most invasive decapod currently expanding its distribution in the Mediterranean Sea
Incidenza della questione energetica e delle infrastrutture sulla salute della popolazione: progetto pilota in Rwanda
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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
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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