1,720,958 research outputs found
Vegetation structure and faunal composition of Wathurana wetland ecosystem Tebuwana, Kalutara, Sri Lanka
Get PDFA study was conducted in Tebuwana Wathurana Wetland ecosystem to understand its vegetation structure and faunal composition in order to assess its conservation needs. As there are no published records on the flora and fauna of Wathurana Wetlands in Tebuwana, it is necessary to understand the ecological and other relevant features in order to develop strategies to conserve this wetland. These objectives were pursued by surveying the vegetation of the wetland and by identifying fish and bird species present. A total of 66 species of flora and 61 species of fauna were identified in the survey. Of the 27 fish species recorded from the Tebuwana Wetland, 9 species were endemic and 17 species belonged to the indigenous category. With regard to the flora in the wetlands, the dominant families were Rubaceae, Fabaceae and Arecaceae. The 66 species belonged to 39 families and 61 genera while 12 species were endemic and 4 species were considered highly threatened. These flora were found in four layers. Of the 22 species of birds recorded, two species were endemic. This study revealed that these Wathurana Wetlands have a high species diversity but that they face many threats including encroachments, extraction of forest products mainly as timber, land filling, mining and occurrence of invasive species. It is essential to minimize the exploitation of natural resources from this wetland in the future and in particular to mark the boundary, conduct awareness programmes and continue research
Vegetation structure and faunal composition of Wathurana wetland ecosystem Tebuwana, Kalutara, Sri Lanka
No full textA study was conducted in Tebuwana Wathurana Wetland ecosystem to understand its vegetation structure and faunal composition in order to assess its conservation needs. As there are no published records on the flora and fauna of Wathurana Wetlands in Tebuwana, it is necessary to understand the ecological and other relevant features in order to develop strategies to conserve this wetland. These objectives were pursued by surveying the vegetation of the wetland and by identifying fish and bird species present. A total of 66 species of flora and 61 species of fauna were identified in the survey. Of the 27 fish species recorded from the Tebuwana Wetland, 9 species were endemic and 17 species belonged to the indigenous category. With regard to the flora in the wetlands, the dominant families were Rubaceae, Fabaceae and Arecaceae. The 66 species belonged to 39 families and 61 genera while 12 species were endemic and 4 species were considered highly threatened. These flora were found in four layers. Of the 22 species of birds recorded, two species were endemic. This study revealed that these Wathurana Wetlands have a high species diversity but that they face many threats including encroachments, extraction of forest products mainly as timber, land filling, mining and occurrence of invasive species. It is essential to minimize the exploitation of natural resources from this wetland in the future and in particular to mark the boundary, conduct awareness programmes and continue research
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
Contamination of Buried Plastic Marine Litter on Sandy Beaches in the West Coast of Sri Lanka
Get PDFSandy beaches act as an interface between land and sea and can serve as an indicator of the level of contamination in the marine environment. The beach can be both a source and a sink for marine litter contamination. Long-term accumulation of buried plastic marine litter (BPML) can produce microplastics by mechanical destruction and/or UV-degradation. This study aims to investigate the contamination and distribution of BPML in the Crow Island (CR) and Wattala (WT) beach areas during the Northeast monsoon. CR had a significantly higher anthropogenic load compared to WT beach. BPML (>5 mm) was determined in 12 quadrats (0.5×0.5 m) per beach area. From each quadrat, sand samples (2 sand samples per quadrat) were obtained in shallow and deep layers of the beach (surface to 3 cm, and 3 cm to 6 cm respectively). The fraction of the mass of coarser sand was determined to identify the relationship between the coarseness of the sand sample and BPML contamination. Coarseness of the sample was determined by removing fine sand using a 1 mm sieve. Accumulation patterns of BPML were analysed between the storm line and sand dune. On average, 21 items/kg Dry Weight (DW) and 7 items/kg DW were collected from sand samples from shallow and deep layers of the CR beach, respectively. In contrast, the WT beach area had almost no plastic pieces on average in a kilogram of dried sand samples collected from both depths. Out of the 24 sand samples collected from the WT beach, only 7 of them contained plastic pieces. Characterization of the polymers of the BPML was carried out using ATR-FTIR. Shallow and deep layers of sample from CR beach contained Polyethylene (10 items/kg DW and 3 items/kg DW respectively) and polyethylene terephthalate (5 items/kg DW and 2 items/ kg DW respectively) type BPML in high amounts. BPML accumulation on the CR beach was significantly affected by the depth of the beach and distance from the storm line (p<0.05, One-way ANOVA). High contamination by BPML is found to be associated with coarser sands. The average fraction of coarser sand for samples collected from the shallow and deep layers of the CR beach near the storm line is 17.4% and 26.1%, respectively, which indicates high contamination of plastics in the deep layer compared to the shallow layer. In contrast, the shallow layer contained a high percentage of coarse sand (5.3%) compared to the deep layer (3.7%) near the sand dune or vegetation. Findings indicate encouraging mitigatory measures to clean up marine litter focusing on both shallow and deep layers is recommended. Keywords: West Coast, Buried plastic marine litter, ATR-FTIR, Coarser sands >< 0.05, One-way ANOVA). High contamination by BPML is found to be associated with coarser sands. The average fraction of coarser sand for samples collected from the shallow and deep layers of the CR beach near the storm line is 17.4% and 26.1%, respectively, which indicates high contamination of plastics in the deep layer compared to the shallow layer. In contrast, the shallow layer contained a high percentage of coarse sand (5.3%) compared to the deep layer (3.7%) near the sand dune or vegetation. Findings indicate encouraging mitigatory measures to clean up marine litter focusing on both shallow and deep layers is recommended.
Keywords: West Coast, Buried plastic marine litter, ATR-FTIR, Coarser sand
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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