1,720,969 research outputs found
Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs
No full textGontijo, Lessando M. (2019): Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs. Journal of Natural History 53 (17): 1061-1069, DOI: 10.1080/00222933.2019.162966
Figure 3 in Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs
No full textFigure 3. Location and frequency of Enchenopa brasiliensis egg clusters on the abaxial leaf midribs and petioles.Published as part of Gontijo, Lessando M., 2019, Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs, pp. 1061-1069 in Journal of Natural History 53 (17) on page 1065, DOI: 10.1080/00222933.2019.1629660, http://zenodo.org/record/367332
Figure 1 in Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs
No full textFigure 1. Adult female of Enchenopa brasiliensis next to a midrib thorn on a Solanum lycocarpum leaf.Published as part of Gontijo, Lessando M., 2019, Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs, pp. 1061-1069 in Journal of Natural History 53 (17) on page 1063, DOI: 10.1080/00222933.2019.1629660, http://zenodo.org/record/367332
Figure 4 in Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs
No full textFigure 4. Regression analysis between the size of Enchenopa brasiliensis egg cluster and size of Solanum lycocarpum thorn cluster associated with eggs. Statistical parameters: R2 = 0.4967, F = 15.22, and P <0.0001.Published as part of Gontijo, Lessando M., 2019, Female treehoppers camouflage behaviour is evidenced during oviposition on wild shrubs, pp. 1061-1069 in Journal of Natural History 53 (17) on page 1065, DOI: 10.1080/00222933.2019.1629660, http://zenodo.org/record/367332
Alyssum flowers promote biological control of collard pests
No full textCollard greens Brassica oleracea (L.) are often attacked by various pests including whiteflies, aphids and diamondback moth. Hitherto, the main method used to manage these pests in Brazil has been the application of a limited number of registered insecticides. The search for more sustainable pest management strategies is therefore warranted. In this context, the conservation biological control stands out as an appealing alternative. Conservation biological control is achieved, at least in part, by strip-cultivating and/or conserving flowering plants within the agroecosystem. The present study investigates how alyssum flowers Lobularia maritima (L.) could contribute to the attraction of natural enemies and to the management of collard pests. Two field experiments were conducted in different years. Each experiment consisted of two treatments and three replicates, which were set up in a completely randomized design. The treatments were (1) collards alone, and (2) collards + alyssum. We evaluated weekly the population density of natural enemies and pests on both treatments. The results show that the alyssum flowers attractiveness contributed to increase the abundance of generalist predators during both experiments, which in turn translated into a significant reduction of collards pests, especially aphids. Some of the main predators attracted/harbored by alyssum flowers were spiders, coccinellids, syrphids and Orius sp. Finally, strip intercropping alyssum with collards can be an important strategy to manage brassica pests and cope with the limited availability of insecticides registered for this vegetable crop
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Female beetles facilitate leaf feeding for males on toxic plants
Get PDF1. Milkweed plants produce latex, which works as a defence against some herbivorous insects. The cerambycid beetles Tetraopes femoratus (LeConte) puncture the leaf midrib vein to extravasate the latex, and thus render the leaf edible. Nonetheless, it has not yet been investigated whether there is any further implication beyond food acquisition regarding this behaviour. 2. The present study examined the hypothesis that leaf latex drainage is done mainly by females of T. femoratus, and that the males opportunistically prefer to feed on those ‘disarmed’ leaves. 3. The experiments revealed that puncturing the leaf midrib vein to extravasate latex is done mainly by females of T. femoratus and not only serves their purpose of food acquisition, but also mediates an opportunistic feeding behaviour among males. 4. Males of T. femoratus preferred to feed on milkweed leaves that had previously been fed upon by females. In addition, field observations showed that mating occurred more frequently on recently ‘disarmed’ leaves, suggesting increased copulation opportunities for females during leaf feeding. 5. In sum, the results reveal that the feeding defence strategy of T. femoratusfemales to toxic milkweed foliage has created an opportunity for males to feed on milkweed leaves with a reduced risk of latex exposure and entanglement. Thus, this research provides empirical evidence of plant–insect interactions contributing to the appearance of an opportunistic adaptive feeding behaviour, which has broader implications for eco-evolutionary systems
Variations on the Author
Get PDF“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
Get PDFWe 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
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