1,721,043 research outputs found
Reassessment of molecular and morphological variation within the Anagrus atomus species complex (Hymenoptera: Mymaridae): egg parasitoids of leafhoppers (Hemiptera: Cicadellidae) in Europe and North America
No full textTriapitsyn, Serguei V., Rugman-Jones, Paul F., Tretiakov, Peter S., Daane, Kent M., Wilson, Houston (2020): Reassessment of molecular and morphological variation within the Anagrus atomus species complex (Hymenoptera: Mymaridae): egg parasitoids of leafhoppers (Hemiptera: Cicadellidae) in Europe and North America. Journal of Natural History 54 (27-28): 1735-1758, DOI: 10.1080/00222933.2020.1827073, URL: http://dx.doi.org/10.1080/00222933.2020.182707
Figure 3 in Reassessment of molecular and morphological variation within the Anagrus atomus species complex (Hymenoptera: Mymaridae): egg parasitoids of leafhoppers (Hemiptera: Cicadellidae) in Europe and North America
No full textFigure 3. Comparison of the clustering of A. 'atomus' complex specimens using ITS2 (tree) and COI (colouring).Published as part of Triapitsyn, Serguei V., Rugman-Jones, Paul F., Tretiakov, Peter S., Daane, Kent M. & Wilson, Houston, 2020, Reassessment of molecular and morphological variation within the Anagrus atomus species complex (Hymenoptera: Mymaridae): egg parasitoids of leafhoppers (Hemiptera: Cicadellidae) in Europe and North America, pp. 1735-1758 in Journal of Natural History 54 (27-28) on page 1751, DOI: 10.1080/00222933.2020.1827073, http://zenodo.org/record/575391
Comparative Life History Parameters of Three Stink Bug Pest Species
No full textCalifornia pistachios are threatened by several stink bug species (Hemiptera: Pentatomidae), including the native Thyanta pallidovirens (Stal) and Chlorochroa uhleri (Stal), as well as the invasive Nezara viridula (L.). In pistachio, control tactics often target specific life stages, which makes knowledge about life histories fundamental to successful IPM programs. For that purpose, life history parameters of these stink bug species were assessed. Nymphal development and survivorship at seven constant temperatures, upper and lower development thresholds, thermal constants, adult longevity and fecundity, and life table parameters were evaluated. No species completed development at 15 degrees C or 35 degrees C. For N. viridula, egg to adult development was fastest at 30 degrees C, whereas for T. pallidovirens there was no significant difference between 27.5 and 30 degrees C and C. uhleri development was similar between 25 and 30 degrees C. Egg to adult survival was highest at 22.5 degrees C and 27.5 degrees C. The thermal requirements as degree-days (DD) to complete immature development were estimated to be 714.3, 370.4, and 434.8 for C. uhleri, T. pallidovirens, and N. viridula, respectively. For C. uhleri, life table calculations produced a value of 56.7 d for mean generation time (T-o), 24.89 for net reproductive rate (R-o) and 0.057 for the intrinsic rate of increase (r). Thyanta pallidovirens had a T-o of 39.9 d, a R-o of 81.10 and a r of 0.11. The results are discussed with respect to the improvement of IPM in California pistachios, and the information presented may contribute to the control of these pest species in other ecosystems
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
Locating the geographical origin of Lobesia botrana (Lepidoptera: Tortricidae): a recent invasive pest to the Americas
Full text linkThe European grapevine moth (EGVM), Lobesia botrana (Denis & Schiffermu_ller) is a major pest of grapevines in the Palearctic ecozone. In 2008, the moth was reported in Chile and subsequently in California in 2009, representing the first establishments in the Americas. To try to ascertain the geographical source of the invasive population in California, 13 populations originating in Europe and the Middle East were compared to populations from the Americas using 686 bp of the mitochondrial CO1 gene and 369 bp of the ribosomal ITS2 intron and phylogenetic techniques. Similar genetics, among and within sample populations, gave no genetic structure and invasive sources could not be determined. Genetic homogeneity indicates global populations feeding on grapes are not composed of alternative genetic races, likely due to high population connectivity and interbreeding throughout the Mediterranean range. Data support that established populations in the Americas are the same as those homogenous populations in the Old World and more sensitive molecular techniques are needed to create definite molecular structure.Includes bibliographical references.color illustration
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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