1,721,000 research outputs found
Grasslands of the Arieş Valley and the Comana Natural Park, Romania: a Stapledon Travelling Fellowship report
Full text linkBroadly, the aims of this Stapledon Memorial Trust Travelling Fellowship were to learn about and investigate the grasslands of two areas of Romania, with a particular focus on the impacts of non-native species where these were present. The two areas visited during this trip were the Arieş and Ampoi river systems in north-west Romania, and the Comana Natural Park, a large area of wetlands and associated habitats south of Bucharest. The report takes the form of a photo diary, with a particular focus on plants, habitats, and incidents that
represent the highlights of both my learning and the trip
A Google Sheets-linked R Shiny app for the expert validation of Species Distribution Models
No full textA Google Sheets-linked R Shiny app for the expert validation of Species Distribution Models. Supporting code for the research paper "Causal inference and large-scale expert validation shed light on the drivers of SDM accuracy and variance" by Robin J. Boyd et al
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
Some environmental factors influencing the distribution of bryophytes in Britain and Ireland
No full textA review of the use of plant community data for assessing ecological quality
No full textThe use of community data for the assessment of quality is best developed in freshwater ecology. Methods such as RIVPACs use statistical relationships between environmental covariables and classifications of reference site communities to assess the relative quality of new sites. Although such ‘RIVPAC-like’ approaches can be conceived of for plant communities, existing sets of data most likely to be appropriate for defining reference sets (e.g. the NVC relevés) lack corresponding sets of environmental data. Environmental data could be extrapolated from extant high quality stands or remote-sensing data, but such approaches seem likely to lead to lower discriminatory ability as compared to actual co-located data. Other options include the 2007 Countryside Survey, which collected co-located environmental data but may not be representative of SSSI-quality habitat features, and the NPMS, which was purposefully biased towards higher quality sites, but which has not so far collected environmental data likely to be of use in a RIVPAC-like approach.
Alternative approaches to assessing quality involve community data in isolation. That is, newly collected plant community data could be compared to reference sets denoting high and low ecological quality for a given habitat through multivariate methods such as classification and ordination. Challenges for this approach include: the selection of the reference samples to be used for any given habitat feature (potentially also taking into account regional variation); for ordination approaches, the number of axes to be assessed as part of a quality assessment, and how movement along these axes is assessed; and, for classification, the choice of clustering method to be used. ‘Fuzzy clustering’ in particular is increasingly used to derive measures of fit of new vegetation samples to existing reference classifications
Plant indicator species for JNCC Common Standards habitat monitoring, UK
No full textDataset contains lists of plant indicator species extracted from the JNCC Common Standards habitat monitoring guidance for the UK. The Common Standards Monitoring (CSM) approach was developed in order to standardise the monitoring of designated nature conservation sites. As well as extracting (and sometimes interpreting) the plant species noted in the CSM guidance documents, we provide links to CSM habitats, National Vegetation Classification communities, National Plant Monitoring Scheme (www.npms.org.uk) indicator species, and provide current taxonomic names in a lookup table
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
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