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STOCK ASSESSMENT OF COMMERCIALLY IMPORTANT FISHES IN THE BAY OF BENGAL THROUGH MOLECULAR MARKERS: MANAGEMENT POLICY IMPLICATIONS
Get PDFAbstract
of Fish eries, University of Rajshahi, Rajshahi, Bangladesh
Stock (population) identification is very crucial both in the context of monitoring
and conservation of the fish species of marine and open water habitats. The
present research was conducted accordingly in the BoB aiming to determine and
categorize the population of some commercially important marine fish species. In
this study, about one hundred samples of each species of ten marine fishes
namely, Pampus chinensis, Pampus argenteus, Euthynnus affinis, Auxis thazard,
Megalaspis cordyla, Lates calcarifer, Setipinna tenuifilis, Sillaginopsis panijus,
Polynemus paradiseus and Coilia dussumieri were collected between October
2020 and April 2022 mainly from coast and rivers of two ecological regions of
Bangladesh coast: the South - west (Borguna-Khulna-Patuakhali, KP) coastal
zone and the South - east (Chattograrn-Cox 's Bazar, CC) coastal zone based on
different physico-chemical characteristics of habitat (KP: high brackish water area
with dense clayed particle in river and estuaries; CC: sandy area with more clear
saline water river and estuaries) and biology of species (e.g. migratory,
amphidromous, anadromous etc.). For amphidromous or anadromous fish,
samples were collected from coastal rivers. Fish/tissue samples or DNA sequence
data of other seas in the Indian Ocean region (e.g. Southern BoB, Andaman Sea,
Arabian Sea, Persian Gulf etc.) and South-west Pacific (e.g. South China Sea,
Gulf of Thailand etc.) were collected from different researchers and scientific
studies. For genetic diversity and stock study, sequence variations in different
mitochondrial DNA gene regions such as COI, Cytb, and noncoding control
region (d-loop) were examined Polymerase Chain Reaction (PCR) was used to
amplify the target mtDNA region and sequenced by sequence analyzer. Lastly,
the variation in the obtained DNA sequence data of different geographic locations
were analyzed using different bioinformatic softwares such as Geneous,
ARLEQUIN, MEGA-6; TCS etc. For all the genes in every sampling locations of
Bangladesh, the nucleotide diversities (zr) were very low (0.000 I ~ 0.05) but the
haplotype or gene diversities (h) were relatively high, 0.5 ~ 1.0 (i.e. h>O.5)
indicates that the studied fishes have experience population expansion after a
period of low effective population size, except two species, M. cordyla and L.
calcarifer for which the gene diversities were also low (0.14 ~ 0.263). This result implies that these two fish species of Bangladesh have experienced recent
bottleneck. Immediate conservation measures should be immediately taken for
these two species, such as limiting catch, banning on fishing season, making long
term sanctuary or protected area etc. Neutrality tests such as Tajima's D and Fu's
Fs statistics also suggested that most of the studied fish species of Bangladesh
populations have undergone the demographic history of population expansion.
Interestingly, the population statistic FST, and exact test of population
differentiation revealed two different scenarios for two group of fishes. The first
group contains six fish species namely P. chinensis, P. argenteus, E. affinis, A.
thazard, M cordyla, L. calcarifer. Fishes of this group have similar
characteristics. These fishes are mostly oceandromous, pelagic and highly
migratory. They are widely distributed throughout the Indian Ocean and SouthWest
Pacific (or, Indo-west Pacific). These fish showed no significant population
genetic structuring indicating that these six species have single genetic stock and
these are panmictic (random mating among populations) throughout Bangladeshi
marine water. Bangladesh should manage these species as a single conservation
unit. Further, these six migratory fish showed its own genetic structure (FST P
:S0.05) within the BoB when compared with other neighboring seas such as
Arabian Sea, Andaman Sea, Gulf of Thailand, South China Sea etc. So, the BoB
countries should manage and conserve these vital and shared marine species
through cooperation with each other. On the other hand, the second group consists
of four species S. tenuifilis, S. panijus, P. paradiseus and C. dussumieri is
relatively distributed to the narrow or localized geographic area mostly in the BoB
and Andaman Sea. These fishes are mostly off-shore or coast dwelling and
amphidromous (i.e. migrate between fresh and marine water but not to breeding
purpose). For these species, pairwise FST values of mtDNA markers among fish
samples of different sampling rivers showed significant differences (P :S0.05) in
most of the cases. Different rivers showed their own genetic stock for different
fish such as Bishkhali, Kirtankhola and Boleshwar river for P. paradeseus and S.
panjius; Naf and Pashur river for C. dussumieri; Matamuhuri and Bishkhali river
for S. tenuifilis etc. Based on this result, it is recommended that different river
populations of studied fish having unique genetic structures (i.e. genetic stock)
require separate monitoring and management strategies for conservation because
the population of each river is genetically distinct and overfishing in any of the
rivers may cause extinction of its fish stock. So, it is needed to maintain good
water flow and direction such as by regular dredging and also needed to control
water pollution for the good ecosystem to safeguard these fish species.
Keywords: BoB, population, stock status, molecular marker, fisheries management
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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