1,720,962 research outputs found
Carex phyllostachys C. A. MEY. (Cyperaceae) new for Italy and Phytogeographical Considerations
No full textThe occurrence of Carex phyllostachys C. A. MEY. has been reported from Santeramo in Colle (Apulia, southeastern Italy) in a deciduous wood, ascribable to the association Stipo bromoidis-Quercetum dalechampii. It is the first record of this species in Italy. The new site represents the westernmost limit of the distribution of this mostly Caucasian species. In Europe the species is very rare, until now known from the Balkan Peninsula only. The occurrence of this species in Apulia underlines once more the affinities between the flora and the vegetation of this Italian region and southeastern Europe. The IUCN assessment leads to consider the species as Critically Endangered (CR) in Italy
New distribution data and relationship with Directive 92/43/EEC on apulian critical taxa growing in Province of Bari
No full textIn this work the authors report news on 20 species growing in Province of Bari. Anthemis hydruntina H. Groves, Ophioglossum lusitanicum L. and Sternbergia colchiciflora Waldst. & Kit., threatened species for Italy and Apulia Region, are reported for the second or third time at regional level, and the first time to Province of Bari; Aegilops biuncialis Vis. and A. uniaristata Vis., reported in the Regional and National Red List, have been found in new stations. Gagea granatellii Parl., Berteroa obliqua (Sm.) DC. subsp. obliqua, Jonopsidium albiflorum Durieu, other 3 species of the Red List, were observed in new stations and provided updates on presence/absence for older works. For Allium garganicum Brullo, Pavone, Salmeri & Terrasi, Cheilanthes acrostica (Balb.) Tod., Geropogon glaber L., Heliotropium supinum L., Orchis laxiflora Lam., Peganum harmala L., Verbena supina L., that are extremely rare taxa at regional or national level and poorly/no documented, important distributional data were provided. New stations of Inula spiraeifolia L., Phlomis fruticosa L. and Scorzonera hirsuta L. were documented. During field surveys two adventitious species of particular interest were also found: Centranthus macrosiphon Boiss. and Convolvulus sabatius Viv. subsp. sabatius. The relationships between these species and the 92/43/EEC Directive show that 13 out of 20 taxa are part of 7 different habitats, while for the other 7 species, insufficient data about plant communities or low numerical consistency of the populations, do not allow the identification of habitat. The data allow the updating of the Natura 2000 Data Forms
Ophioglossum lusitanicum L.: New Records of Plant Community and 92/43/EEC Habitat in Italy
Full text linkIn this paper, integrating field surveys and literature data, an analysis of Ophioglossum lusitanicum plant communities and related 92/43/EEC habitats are reported for Italy. Two new syntaxa, Euphorbio exiguae-Ophioglossetum lusitanici ass. nova hoc loco and trifolietosum scabri subass. nova hoc loco of the Rumici bucephalophori-Ophioglossetum lusitanici were described in the Apulia and Campania regions.Both types of vegetation identified in Apulia, Campania, and Sicily regions represent two different aspects of the same priority habitat: “pseudo-steppe with grasses and annuals of the Thero-Brachypodietea” (habitat code 6220*). A phytosociological and ecological dataset of the literature and new field surveys highlighting the soil type as parameters affecting the vegetation cover of this small fernlike plant, with the Trachynion distachyae Rivas–Martínez, 1978 alliance on calcareous soils and Helianthemion guttati Br.-Bl. in Br.-Bl. et al., 1940 alliance on volcanic soils. Many species of other types of annual meadows have been identified within Ophioglossum communities due to the very small patches of land, where they have been found, and ecological conditions that facilitate this phenomenon of the transgression of other therophytes species
Notulae 2135-2136: Gagea lacaitae A. Terracc. e Ornithogalum etruscum Parl. subsp. etruscum
No full textNotulae: 2135–2136. Gagea lacaitae (Liliaceae), Ornithogalum etruscum subsp. etruscum (Asparagaceae). In: Bartolucci F., Nepi C., Domina G., Peruzzi L. (eds.), Notulae alla checklist della flora vascolare italiana: 20
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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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