1,721,013 research outputs found
Molecular and phenotypic data reveal a new Amazonian species of pit vipers (Serpentes: Viperidae: Bothrops)
No full textDal Vechio, Francisco, Prates, Ivan, Grazziotin, Felipe G., Graboski, Roberta, Rodrigues, Miguel Trefaut (2021): Molecular and phenotypic data reveal a new Amazonian species of pit vipers (Serpentes: Viperidae: Bothrops). Journal of Natural History 54 (37-38): 2415-2437, DOI: 10.1080/00222933.2020.1845835, URL: http://dx.doi.org/10.1080/00222933.2020.184583
Schistometopum ephele Taylor 1965
No full textwe recommend recognizing these lineages as distinct species and remove S. ephele Taylor, 1965 from synonymy with S. thomense (Bocage 1873).Published as part of O'Connell, Kyle A., Prates, Ivan, Scheinberg, Lauren A., Mulder, Kevin P. & Bell, Rayna C., 2021, Speciation and secondary contact in a fossorial island endemic, the São Tomé caecilian, pp. 1-13 in Molecular Ecology 30 (12) on page 9, DOI: 10.1111/mec.15928, http://zenodo.org/record/582768
Figure 8 in Molecular and phenotypic data reveal a new Amazonian species of pit vipers (Serpentes: Viperidae: Bothrops)
No full textFigure 8. Bothrops brazili in dorsal view. A- DHMECN3035 from Ecuador B- QCAZ4827 from Pastaza, Ecuador. Scale bar = 1 cm.Published as part of Dal Vechio, Francisco, Prates, Ivan, Grazziotin, Felipe G., Graboski, Roberta & Rodrigues, Miguel Trefaut, 2021, Molecular and phenotypic data reveal a new Amazonian species of pit vipers (Serpentes: Viperidae: Bothrops), pp. 2415-2437 in Journal of Natural History 54 (37-38) on page 2428, DOI: 10.1080/00222933.2020.1845835, http://zenodo.org/record/575683
Figure 3 in Subspecies at crossroads: the evolutionary significance of genomic and phenotypic variation in a wide-ranging Australian lizard (Ctenotus pantherinus)
No full textFigure 3. Geographical distribution of the characters proposed to diagnose subspecies in Ctenotus pantherinus. The top left panel indicates the presumed ranges of the four subspecies as in Figure 1B: C. p. acripes (a), C. p. calx (c), C. p. ocellifer (o) and C. p. pantherinus (p). For the quantitative characters (remaining left panels), colours of circles indicate average trait values in a locality. Juveniles (<75 mm) were not included in the snout–vent length map. For the qualitative characters (right panels), pie charts indicate the relative frequency of alternative character states in a locality. Some character states tended to be more frequent in certain regions, yet many specimens deviated from these regional trends.Published as part of Prates, Ivan, Doughty, Paul & Rabosky, Daniel L., 2023, Subspecies at crossroads: the evolutionary significance of genomic and phenotypic variation in a wide-ranging Australian lizard (Ctenotus pantherinus), pp. 768-786 in Zoological Journal of the Linnean Society 197 on page 775, DOI: 10.1093/zoolinnean/zlac076, http://zenodo.org/record/769607
Dehydration hardly slows hopping toads (Rhinella granulosa) from xeric and mesic environments
Full text linkThe locomotor capacity of amphibians depends strongly on temperature and hydration. Understanding the potential interactions between these variables remains an important challenge because temperature and water availability covary strongly in natural environments. We explored the effects of temperature and hydration on the hopping speeds of Rhinella granulosa, a small toad from the semiarid Caatinga and the Atlantic Rain Forest in Brazil. We asked whether thermal and hydric states interact to determine performance and whether toads from the Caatinga differ from their conspecifics from the Atlantic Forest. Both dehydration and cooling impaired hopping speed, but effects were independent of one another. In comparison to performances of other anurans, the performance of R. granulosa was far less sensitive to dehydration. Consequently, dehydrated members of this species may be able to sustain performance through high body temperatures, which agrees with the exceptional heat tolerance of this species. Surprisingly, toads from both the Caatinga and the Atlantic Forest were relatively insensitive to dehydration. This observation suggests that migration or gene flow between toads from the forest and those from a drier region occurred or that toads from a dry region colonized the forest secondarily
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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