1,721,096 research outputs found
Data_Hartmann_Metz_2025_Productivity_moisture_competition_affecting_viability_of_Dactylorhiza_majalis_under_conservation
No full textWe studied 95 wet grassland sites across the Federal State of Brandenburg in NE-Germany . All sites harbored extant populations of D. majalis in our study years (86 sites) or at least until 5 years ago (9 sites).
In order to characterize the vegetation and derive abiotic parameters, we conducted vegetation relevés in 3 – 6 plots of 2m × 2m in all sites during the main flowering period of D. majalis (mid-May – June). Across all 95 sites, we sampled in total 355 plots (3.7 plots per site on average), spread over three years for feasibility (2020 – 2022).
In each 2m × 2m plot, all vascular plant species were identified to species level and their abundance was estimated using the scale of Braun-Blanquet (1964). As indicators of vegetation structure, we measured the average height of the vegetation (hereafter vegetation height), estimated the percent of ground covered by bryophytes (hereafter moss cover) and summed up the percent of all Poaceae species per 2m × 2m plot (hereafter grass cover). Moreover, we derived abiotic parameters from the vegetation relevés by calculating mean Ellenberg indicator values (EIV; weighted by the log-transformed cover per species) for moisture (F), nitrogen (N), and soil reaction (R) for each 2m × 2m plot (Ellenberg et al., 1992).
Four proxies for population viability (hereafter viability proxy) were measured within the above described 2m × 2m plots: As abundance-based viability proxies, we counted the total number of i) juvenile and ii) flowering individuals of D. majalis per plot.
As individual-based proxies of flowering individuals, we iii) counted their total number of flowers and iv) quantified their plant size. For the latter, we counted the leaves, measured the width and length of the first (subscript 1) and second (subscript 2) leaf closest to the ground, and quantified plant size as: leaf number × [(0.5 × leaf width1 × leaf length1) + (0.5 × leaf width2 × leaf length2)] (similar to Kindlmann and Balounová, 1999). Both individual-based proxies were quantified for and subsequently averaged across 5 (2021, 2022) or 10 (2020) randomly chosen flowering individuals per 2m x 2m plot, if available. If fewer flowering individuals occurred, all were measured. This resulted in a total of 1715 measured flowering individuals across 214 plots in 74 sites.
As a fifth viability proxy, describing the long-term performance of D. majalis at the population level, we categorized whether population trends were positive, negative or had no trend (stable). For 60 sites, trend categories were calculated from long-term monitoring data of practitioners (1993 – 2020) with yearly counts of flowering D. majalis: (details in Hartmann and Metz, 2023). For 35 sites, the population trends (positive, negative, no trend) were based on expert judgements of practitioners that are familiar with the respective site for several years
The significance of definitional dimensions of luxury food
No full textPurpose - An observable shift in food consumption motives for some German consumer segments has created new market potentials for high-priced food items. The purpose of this paper is to empirically show whether and to what extent financial, functional, individual and social dimensions as well as sustainability and authenticity contribute to consumers' perception of the luxury value of food. Design/methodology/approach - The effects of seven exploratory value dimensions on a perceived luxury value for foods were measured using a partial least squares structural equation analysis of a database generated by a survey done on 936 German consumers in summer 2014. Findings - Luxury food was found to serve as a suitable setting to investigate both old and new motives for luxury consumption. The analyses revealed that all factors contribute significantly to luxury value, with functional and individual luxury facets having the strongest effects. Practical and methodological implications can be derived from the results. Research limitations/implications - Limitations are due to the applied methodology. Practical implications - The definitional dimensions of a luxury food value correspond to those for a general luxury good. The significance of two new luxury values, sustainability and authenticity, was confirmed for luxury food. The functional and individual luxury values were found to be the most significant. This supports the previously postulated change in motives for luxury consumption and also mirrors the new emphasis on quality and self-identity in the German food sector. These findings can be utilised in practical food marketing. Originality/value - Although there are major similarities between food and luxury good consumption patterns, how luxury can be defined in the context of food had not been previously investigated empirically. This paper is the first to study the factors that contribute to the luxury value of food
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
No full textWe 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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