1,720,955 research outputs found
Effectiveness of Pollination by Wild Bees as Influenced by Landscape Composition and Distance from Natural Habitat
No full text• Honey bees have traditionally been used for crop pollination but are currently facing a population decline
• Wild bees may present a supplement or alternative to honey bee pollination
• A high diversity of pollinators ensures fruit pollination
• Wild bees may be more effective pollinators in some cases than honey bees
• However, the percent of surrounding agriculture and the distance of the crops from natural habitat may negatively affect wild bee presence
• This research sought to determine the following objectives:
1.) If wild bees could provide pollination services on par with honey bees
2.) If pollination by wild bees varied with landscape composition
3.) If distance of target plants from natural habitat affected pollination by wild bee
Effectiveness of Pollination by Wild Bees as Influenced by Landscape Composition and Distance from Natural Habitat
No full text1 Broadside. Original created in Microsoft PowerPoint. 48"W x 36"HHoney bees have traditionally been used for crop pollination but are currently facing a population decline.
Wild bees may present a supplement or alternative to honey bee pollination.
A high diversity of pollinators ensures fruit pollination.
Wild bees may be more effective pollinators in some cases than honey bees.
However, the percent of surrounding agriculture and the distance of the crops from natural habitat may negatively affect wild bee presence.
This research sought to determine the following objectives: If wild bees could provide pollination services on par with honey bees, if pollination by wild bees varied with landscape composition, and if distance of target plants from natural habitat affected pollination by wild beesKalamazoo College. Department of Biology. Diebold Symposium, 201
Effectiveness of pollination by wild bees as influenced by landscape composition and distance from natural habitat
No full textv, 28 p.Bees are an animal pollinator often utilized by fruit growers. While honey bees have historically been used for crop pollination, they are currently facing a number of threats to their population. Wild bees present a potential source of pollination services for crops to supplement those provided by honey bees. However, landscape composition and the availability of foraging and nesting resources might affect wild bee abundance and therefore pollination services. We looked at wild bee pollination in cranberry marshes in Wisconsin. The objectives of this research were to determine (1) if wild bees could provide pollination services equivalent to those provided by honey bees, (2) if wild bee pollination varied with landscape composition and (3) if distance from edge of natural habitat affected pollination by wild bees. Sites were chosen so that the surrounding landscape varied from below 35% to above 60% of agriculture or wooded area within 2 km of sites. Pan traps were placed in cranberry marshes to measure wild bee abundance. Sentinel plants, including sunflower and buckwheat, were placed in cranberry fields and visitation rates and seed count were recorded to represent pollination success. Wild bee abundance was found to be positively correlated with surrounding woodland, but was not significantly correlated with surrounding agriculture. Seed number did not significantly vary in the presence or absence of honey bees or with surrounding agriculture or wooded area. It was, however, significantly affected by an interaction between honey bee presence and surrounding agriculture. Seed number did not significantly differ at increasing distances from natural habitat. Based on these observations, wild bees may be a viable alternative to honey bees depending on habitat composition.Made publicly available on 5/27/14 at the request of the author.Department of Entomology. University of Wisconsin-Madison. Madison, Wisconsin
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
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