1,720,956 research outputs found
Quantifying the effects of wildfire reintroduction on native pollinators in ponderosa pine forests of the Pacific Northwest
No full textThesis (Ph.D.)--University of Washington, 2025Pollinators are an essential component of ecosystem function, and declining bee populations are a global conservation concern. Despite this importance, there is a lack of understanding regarding the distribution and demography of native bee species across western North American landscapes. Furthermore, the effects of disturbance on these essential fauna are understudied. Fire is a major driver of biodiversity and structural integrity in fire prone ecosystems. Over the last century, historical wildfire regimes have shifted due to climate change, exclusion of Indigenous fire stewards, and land management philosophies. As a result of these pressures, forests have experienced increases in fuel buildup that threatens dry forest resilience across western North America. In these post-fire landscapes, pollination is critical for vegetation recovery and ecosystem health. Pollinators are critical for successful angiosperm reproduction, food security, and ecosystem resilience. Because pollination services can vary by species and across spatial and temporal scales, land managers and ecologists seek to understand the spatial and temporal effects of fire reintroduction on native bee communities. An increased understanding of the effects of fire on pollinators can inform conservation management and ecosystem restoration. In this dissertation, I used field based and molecular methods to evaluate the effects of fire reintroduction on bee community composition across a temporal range of 1-9 years post-fire, and in an unburned control, in the Okanogan-Wenatchee National Forest in Washington, USA. In Chapter 1, I quantified native bee richness at nine forested plots using blue vane and pan traps, and determined that native bee genus richness was driven by the interaction between burn severity and burn age. Study areas that had been recently burned at higher severities had higher bee genus richness values. Furthermore, the proportion of above ground nesting bees in landscapes 1-8 years post-fire were greatest at sites that burned with moderate fire severity and had more available nesting habitat. In Chapter 2, I highlighted shifts in foraging resources for pollinator communities in post-fire landscapes based on DNA metabarcoding of pollen collected in blue vane and pan traps. The findings suggest that herbaceous perennials such as Achillea millefolium, Lupinus spp., and Phacelia hastata are important floral resources for post-fire pollinator communities. Burn age and burn severity were important drivers of plant-pollinator network richness, and plant species richness increased with burn age and burn severity. This work is the first to use pollen suspended in trap solutions to quantify floral resources for insect pollinators and highlights the utility of trap byproducts to provide insightful ecological information. In Chapter 3, I evaluated changes in pollinator demography to provide insights for bee community health following disturbance by wildfire. By deploying nesting materials across three burned landscapes and one unburned control, I quantified native wood-cavity-nesting bee reproductive success for two exemplar pollinator species: Osmia lignaria propinqua and Osmia kincaidii. The results suggest that burn age is the main driver of wood-cavity-nesting bee oviposition. Furthermore, DNA metabarcoding of pollen from nest boxes revealed herbaceous perennials such as Phacelia hastata and Epilobium brachycarpum to be important floral resources for wood-cavity-nesting pollinators. Finally, in Chapter 4, I documented new records of Melissodes nigracauda LaBerge, Dufourea dilatipes Bohart, Atoposmia abjecta abjecta Cresson, Coelioxys funerarius Smith, Dianthidium cressonii Dalla Torre, Dianthidium singulare Cresson, Osmia cyaneonitens Cockerell, and Stelis heronae Sheffield. These eight new records supplement the ~565 bee species previously documented in Washington state. Collectively, I assessed the effects of wildfire in ponderosa pine forests on native pollinator community composition, wood-cavity-nesting bee reproductive success, and plant-pollinator networks. These findings highlight the importance of fire reintroduction for native pollinator conservation in dry forest landscapes
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
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
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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