1,720,958 research outputs found
Taxonomy and distribution of Italian and Antarctic Pycnogonida, with identification keys to genera and species
No full textQuesta tesi fornisce una descrizione dei progetti realizzati nel triennio 2018-2021 nell'ambito dello studio dei Picnogonidi.
Viene riportata una panoramica generale della classe Pycnogonida (Arthropoda, Chelicerata), evidenziando le principali caratteristiche di questi organismi.
Successivamente viene proposta la checklist aggiornata dei Picnogonidi italiani (Colasanto e Galli, 2021) con la distribuzione dettagliata delle specie, generata undici anni dopo quella di Bartolino e Chimenz (2010). La chiave dicotomica proposta per l'identificazione delle specie fa riferimento a questi documenti. La chiave è stata ottenuta attraverso indagini bibliografiche sulle caratteristiche morfologiche della specie, integrando con informazioni tratte da chiavi già presenti in letteratura (in particolare, Munilla e Soler-Membrives, 2014) e analisi di campioni in laboratorio.
Parallelamente allo studio dei Picnogonidi italiani, sono stati esaminati gli esemplari conservati al Museo Nazionale dell'Antartide ed è stato effettuato uno studio di DNA barcoding su alcuni di essi. Sono state abbozzate chiavi di identificazione di generi e specie, sulla base delle caratteristiche morfologiche.
Conseguentemente, viene riportata anche la checklist aggiornata dei Picnogonidi antartici e sub-antartici.
Si riportano infine alcune considerazioni sulla possibilità di coinvolgere i subacquei nel monitoraggio dei Picnogonidi attraverso progetti di citizen science.This thesis provides a description of the projects carried out in the three-year period 2018-2021 as part of the study of Pycnogonida.
A general overview of the class Pycnogonida (Arthropoda, Chelicerata) is reported, highlighting the main characteristics of these organisms.
Subsequently, the updated checklist of the Italian pycnogonids (Colasanto and Galli, 2021) is proposed with the detailed distribution of the species, generated eleven years after that of Bartolino and Chimenz (2010). The dichotomous key proposed for the species identification refers to these documents. The key was obtained through bibliographic investigations on the morphological characteristics of the species, integrating with information taken from keys already present in the literature (in particular, Munilla and Soler-Membrives, 2014) and laboratory analysis of samples.
Parallel to the study of the Italian pycnogonids, specimens preserved at the National Museum of Antarctica were examined and the barcoding DNA of some of them was sequenced. Identification keys to genera and species were sketched, based on morphological characters. Therefore, the updated checklist of Antarctic and sub-Antarctic Pycnogonida is also reported.
Finally, some considerations on the possibility to involve Scuba-divers on pycnogonids monitoring through citizen science projects are reported
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People’s contribution to the knowledge of Pycnogonida: citizen science in the case of a “problematic” taxon.
Full text linkPycnogonida is a poorly known class of marine arthropods represented by nearly 1350 species described worldwide. We examined data about these organisms available on seven websites for photographs and information sharing among recreational naturalists. We found 384 observations, mainly with data about locality and date. Photos about 65 of them resulted correctly identified to the species level with certainty. The others refer to species whose identification requires a more in-depth analysis under a microscope. Unfortunately, this problem is common to a high percentage of pycnogonids. Therefore it seems unlikely that citizen scientists could contribute significantly to their knowledge. Nevertheless, for some species this would be possible and data on the presence of the taxon could be useful for more general studies at community level
Protura
No full text<p> <b>Key to orders</b></p> <p> 1A All three pairs of abdominal appendages two-segmented, with a terminal vesicle and five setae...... <b>Eosentomata</b></p> <p> 1B Abdominal appendages I two-segmented with a terminal vesicle and three to four setae; those on abdominal segment II and III two-segmented, with a terminal vesicle and three to four setae, or uni-segmented, without vesicle and with one to three setae......................................................................................................................... <b>2</b></p> <p> 2A Median setae present on meso- and metanotum................................................................................ <b>Acerentomata</b></p> <p> 2B Median setae absent on meso- and metanotum.................................................................................... <b>Sinentomata</b></p>Published as part of <i>Galli, Loris, Capurro, Matteo, Colasanto, Elisa, Molyneux, Tony, Murray, Andy, Torti, Carlo & Zinni, Matteo, 2019, A synopsis of the ecology of Protura (Arthropoda: Hexapoda), pp. 155-164 in Revue suisse de Zoologie 126 (2)</i> on page 156, DOI: <a href="http://zenodo.org/record/3463443">10.5281/zenodo.3463443</a>
A synopsis of the ecology of Protura (Arthropoda: Hexapoda)
No full textKey to Acerentomata families 1A Only abdominal appendages I two segmented.........................................................................................................2 1B Abdominal appendages I and II two-segmented......................................................................................................3 2A Sternite VIII with two anterior and four posterior setae: formula 2/4................................ Hesperentomidae (part) 2B Sternite VIII never with 2/4 setae, normally with four anterior and none or two posterior setae: formula 4/0 or 4/2..................................................................................................................................................... Acerentomidae 3A All three pairs of abdominal appendages two-segmented with a terminal vesicle and four setae..........................4 3B Abdominal appendages I and II two-segmented with a terminal vesicle and three to four setae, appendages III unisegmented without terminal vesicle and with two to three setae.............................................................................5 4A Labial palps with tuft of setae, three distinct setae and basal sensillum; pseudoculi with a large triangular prolongation in the proximal part.......................................................................................... Protentomidae (part) 4B Labial palps with tuft of setae and three distinct setae, but without basal sensillum; pseudoculi pear-like, strongly elevated and with a median S-shaped cleft......................................................................... Hesperentomidae (part) 5A Abdominal sternites II-VI all with an even number of posterior setae (seta Pc always absent)........................................................................................................................................................................... Hesperentomidae (part) 5B An odd number of setae in the posterior row (seta Pc present) of at least one of the abdominal sternites II-VI....................................................................................................................................................... Protentomidae (part)Published as part of Galli, Loris, Capurro, Matteo, Colasanto, Elisa, Molyneux, Tony, Murray, Andy, Torti, Carlo & Zinni, Matteo, 2019, A synopsis of the ecology of Protura (Arthropoda: Hexapoda), pp. 155-164 in Revue suisse de Zoologie 126 (2) on page 156, DOI: 10.5281/zenodo.346344
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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