1,720,994 research outputs found
Demographic and environmental correlates of home ranges and long-distance movements of Mohave ground squirrels
No full textPoessel, Sharon A, Leitner, Philip, Inman, Richard D, Esque, Todd C, Katzner, Todd E (2023): Demographic and environmental correlates of home ranges and long-distance movements of Mohave ground squirrels. Journal of Mammalogy 104 (1): 104-114, DOI: 10.1093/jmammal/gyac082, URL: http://dx.doi.org/10.1093/jmammal/gyac08
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
Characterization of Texas Tortoise (Gopherus berlandieri) Home Ranges, Habitat Use, and Landscape-scale Habitat Connectivity in Cameron County, Texas
No full textNo abstract prepared.Biolog
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
Seedling Ecology and Restoration of Blackbrush (Coleogyne ramosissima) in the Mojave Desert
No full textWorldwide, ecological communities are disappearing due to the joint stresses of climate change, species invasions and urbanization. In the southwestern U.S., the blackbrush (Coleogyne ramosissima) community is among the most threatened. It occurs primarily in the transition zone between the Mojave and Great Basin deserts and on the western border of the Sonoran Desert, forming vegetation bands at mid-elevation between 750 and 1,900 m from southeastern California to southwestern Colorado. Fire is the most important threat to this community, as blackbrush is slow to regenerate after fire, and fire frequency has increased due to global warming and invasion by exotic grasses, which added fine fuels. The blackbrush community could disappear entirely in the foreseeable future if steps are not taken to facilitate shrub regeneration after fire.
In this study, I tested the efficacy of several methods for promoting the germination and establishment of introduced seeds, each designed to mitigate potential recruitment bottlenecks: lack of sufficient moisture, seed and seedling predation, and high incident radiation. In addition, I tested these methods across an elevational gradient, to determine if best practices differ by location in the blackbrush range. I hypothesized that a) negative effects of moisture limitations and b) positive effects of proximity to nurse plants would decrease with elevation, while c) rates of seed or seedling predation would increase with elevation as plant productivity and rodent food availability increases.
I conducted two plot-scale experiments over two years in the Mojave Desert of southern California using a fully factorial design at each of three elevations. Factors included a) seed preparation (encapsulated in seed ball to trap moisture surrounding the seed, or bare seed), b) predator-exclusion (with or without wire cages), and c) proximity to mature shrubs (distant or near). Three elevations were chosen on the basis of local blackbrush abundance from low, at the lower boundary of its range, to high in the zone where blackbrush begins to exclude most other shrub species.
In the two years of the study, across sites and treatments, germination from bare seeds was much higher than from seed balls. Emergence and survival were highest in caged plots across the elevational gradient, and effect sizes increased with elevation. There was a positive effect of creosotebush nurse plants on emergence at low elevation, while proximity to a nurse plant interacted with the cage treatment mid- and high elevation such that there was higher predation under adult shrubs even though they provided a beneficial micro-climate in the presence of predator exclusion cages. Supporting my initial hypotheses, blackbrush regeneration was most limited by predation at the highest elevation, while positive nurse plant effects were maximized at lowest elevation. However, encapsulation of the seed had negative effects in the first growing season but permitted seeds to persist in the seed bank into the second growing season, creating a bet hedging strategy not naturally present in this species. More large seedlings were present at mid- and high elevation.
Blackbrush recruitment in the Mojave Desert depends on rare year types with higher than average precipitation and effective restoration has to take rainfall uncertainties into consideration. Use of seed balls may help blackbrush maintain a seed bank, which could be more important for achieving establishment than achieving high germination rates using bare seeds only in the year of application. Proximity to nurse plants should be a minor consideration, as the environmental benefits of germinating close to a mature shrub are partially or fully outweighed by predator attraction. My study shows that the careful examination of a species’ vulnerabilities and conditions for recruitment can help formulate sensible strategies for restoration and can be used as a model for the restoration of other threatened plant communities in a variety of contexts.Biolog
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
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