1,720,957 research outputs found
Preliminary Study of Sea Urchins Associated to Two Locations in Southern Coast of Sri Lanka
No full textSea urchins (Echinodermata) are an essential class of herbivores in both temperate and tropical food webs. They maintain the amount of macroalgal cover, affecting primary productivity and phase changes on reefs. The sea urchin has been recognized as a cultivable marine invertebrate species because of its commercial potential. This study aims to determine sea urchin diversity and abundance at two locations covering the Pareiwella and Polhena coral reefs in southern Sri Lanka. The study was carried out using permanent transect sampling method and transects were parallel to shoreline with the length varying from 10m-20m at the selected sites during low tide at 0.5m-1m depth range in Pareiwella and 0-0.5m depth range in Polhena to estimate the sea urchin abundance during December 2023 to January 2024. In the field, a 0.5 m × 0.5 m quadrate was placed along transects at permanent points, and each species of sea urchin was counted within the quadrate. The abundance and diversity of Sea urchins at two sites were estimated, and their mean values were compared. According to the results, a total of 4-6 sea urchin species (Diadema setosum, Stomopneustes variolaris, Toxopneustes pileolus, Tripneustes gratilla, Echinothrix calamaris and Echinometra mathaei from Polhena and Diadema setosum, Stomopneustes variolaris, Tripneustes gratilla, and Echinometra mathaei from Pareiwella) were identified between the two sampling sites. On the Pareiwella and Polhena site, sea urchin distribution is recorded as 33 individuals m-2 and 12 individuals m-2 respectively. Shannon Weiner index of diversity was highest in Polhena (H’=1.1). Results showed the dominance of Stomopneustes variolaris in Polhena reef and Echinometra mathaei in Pareiwella reef. Stomopneustes variolaris and Echinometra mathaei resulted in higher abundances for distribution in the Pareiwella and Polhena site respectively. Further studies are necessary to investigate the feeding preference of sea urchins in a wider context.
Keywords: Sea Urchins, Diversity, Abundance, Distribution 
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
Microbial Ecology Associated to the Coral Recruitments Dynamics in Southern Sri Lanka
Get PDFCoral reefs are made by coral organisms, and they produce their mineral substrate. Coral reefs are formed of colonies of coral polyps held together by calcium carbonate. The coral reefs ecosystems were lost due to the summation of both natural and anthropogenic activities. Coral recruitment is a critical process. Helps maintain coral populations and facilitates recovery after a disturbance by ultimately influencing abundance and species composition. This study was carried out to find recruitment patterns of reef building corals and other associated organisms and microbial ecology at the time with relation to coral recruitment. Five tiles were deployed in each 3 locations after one[1]month preconditioning (Depth~4 m). Tiles were collected back within 3-week intervals. Bacteria colonization and direct counts were observed using culture media plates and epifluorescence microscopy respectively. Epiphytic organisms were observed in tiles and counted to determine coverage analysis. Coral Crustose algae (CCA) were dominant among them. According to results, after 6 weeks of deploying, newly recruited corals were observed and identified as Pocylophora sp. and Goniastrea spp. Coral recruitment did not show difference between study sites (p˃0.05, p=0.145) but showed positive relationship with time (p˂0.05; p=0.032, R²=79.4). And total bacteria count (p˂0.05, p=0.000). And virus count (p˂0.05, p=0.013) in tile and water column showed the significant difference between study sites. Paraviwella showed highest bacteria and virus count in water column and highest bacteria count in tiles while Waligama showed highest virus count in tiles. It may be due discharges from Tangalle harbor may contaminate with water and due to basin topography of Paraviwella reef area bacteria and viruses remained in high concentrations. Pathogenic bacteria in tiles (Vibrio sp. Escherichia coli and Shigella sp.) were not significantly different between sites and do not show any relationship with coral recruitment. CCA cover did not differ between study sites but showed a positive relationship with coral recruitment. Terracotta tiles were able to recruit coral within a low time period like 2 to 3 months. Out of all sites Polhena was the most suitable site with relatively faster for coral recruitment.
Keywords: Coral recruitment, Terracotta tiles, Microbial ecology, Virus, CC
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
