1,720,955 research outputs found
Data set for the publication "Specificity within bird-parasite-parasitoid food webs: a novel approach for evaluating potential biological control agents of the avian vampire fly"
No full textData set in csv format showing total abundance of two species of flies found in Loma Alta1. Quantitative food web analyses can provide insights into the specificity of consumers such as herbivores, parasites, and parasitoids. Understanding such patterns can be useful in forecasting the potential benefits and risks of biological control agents being considered for introduction against invasive species.
2. The avian vampire fly, Philornis downsi (Diptera: Muscidae), is a neotropical bird parasite that is invasive in the Galapagos Islands, where it is causing substantial mortality of endemic bird species. We used a novel in-field experimental food web approach within the native range of P. downsi in Ecuador to test the hypotheses that pupal parasitoids known to attack P. downsi specialize on members of the genus Philornis, which occur only in bird nests. We deployed pupae of non-Philornis fly species adjacent to bird nests to assess specificity of the parasitoids and used two indices to assess specificity: Resource Range (RR), which evaluates the breadth of host use, and Pair Difference Index (PDI), which evaluates interaction strength.Ramirez, Ismael E; Causton, Charlotte E; Gutierrez, George A; Mosquera, Denis A; Piedrahita, Paolo; Heimpel, George E. (2022). Data set for the publication "Specificity within bird-parasite-parasitoid food webs: a novel approach for evaluating potential biological control agents of the avian vampire fly". Retrieved from the University Digital Conservancy, https://doi.org/10.13020/ZKJ4-QA65
Data set for the publication 'Invasive fly species displaces natives in Galapagos with implications for biological control risk assessment'
No full textThe data set describes the necrophagous insects collected in the Galapagos Islands using meat bait during the wet and dry seasons.The composition and interactions of carrion flies in the Galapagos Islands is poorly understood, especially when focusing on competition between introduced and endemic fly species. We aimed to assess such composition and interactions by deploying carrion bait traps during the cool and hot seasons, and an experimental approach in a controlled setting was used to investigate interspecific competition among them. Of the eight fly species found in our baited traps, all were introduced except for the endemic sarcophagid, Sarothromyiops dasycnemis (Thomson), and a number of endemic species expected to be encountered were not found. The introduced sarcophagid, Peckia chrysostoma (Wiedemann) was the most abundant fly species found overall, comprising over half of the collected specimens. Most fly species exhibited some level of habitat preference. We conducted a laboratory experiment on resource competition between P. chrysostoma and a subset of the fly species encountered in the baiting study. The results demonstrated that P. chrysostoma is a strong competitor against other carrion fly species in the Galapagos necrobiome, including the endemic S. dasycnemis. A comparison of our data to historical records of fly abundance in Galapagos, combined with the results of our laboratory study, leads to the conclusion that introduced carrion fly species such as P. chrysostoma represent a threat to endemic carrion fly species, such as S. dasycnemis. Three parasitoid species were reared from the puparia collected, two that attacked fly larvae (Brachymeria podagrica and Aphaereta sp.) and one that attacked puparia (Exoristobia sp.). We discuss our results in light of the possibility of the purposeful introduction of a hymenopteran parasitoid as a biological control agent against the avian vampire fly (Philornis downsi Dodge & Aitken) in Galapagos.Ramirez, Ismael E; Yar, Joselyn; Sinclair, Bradley J; Torres, Ana K; Causton, Charlotte E; Heimpel, George E. (2023). Data set for the publication 'Invasive fly species displaces natives in Galapagos with implications for biological control risk assessment'. Retrieved from the Data Repository for the University of Minnesota (DRUM), https://doi.org/10.13020/3S96-FJ14
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
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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