1,721,023 research outputs found
Populationsdemographie und Lebenszykluscharakteristika einer für den Aquarienhandel im Spermonde Archipel, Indonesien, gesammelten Pilzkorallenart: Heliofungia actiniformis (Fungiidae)
No full textA popular coral in the Indonesian live coral trade is the fungiid Heliofungia actiniformis. At non-harvested sites attached polyps aged 0-4 years were found to be most abundant, and growth rates decreased linearly with size. At harvested sites, total mortality rates were significantly higher for polyps sized 0-11 cm, and semi-structured interviews with local fishermen confirmed a size selective fishery towards small polyps. A utility per recruit calculation revealed maximum potential economic yield to occur at an age of 5 years, five years before reaching reproductive maturity. Subsequent Thompson and Bell calculations highlighted the need for a combination of size limits, quota reductions as well as the protection of spawning stocks. Genetic population connectivity patterns of H. actiniformis revealed significant genetic structuring, both among populations in South Sulawesi and throughout the Indo-Malay Archipelago. At both scales the degree of geographic separation and oceanographic features influenced the degree of larval exchange, with historical influences additionally shaping patterns on the large scale
Population Demographics and Life History Characteristics of Heliofungia actiniformis: a Fungiid Coral Species Exploited for the Live Coral Aquarium Trade in the Spermonde Archipelago, Indonesia
No full textA popular coral in the Indonesian live coral trade is the fungiid Heliofungia actiniformis. At non-harvested sites attached polyps aged 0-4 years were found to be most abundant, and growth rates decreased linearly with size. At harvested sites, total mortality rates were significantly higher for polyps sized 0-11 cm, and semi-structured interviews with local fishermen confirmed a size selective fishery towards small polyps. A utility per recruit calculation revealed maximum potential economic yield to occur at an age of 5 years, five years before reaching reproductive maturity. Subsequent Thompson and Bell calculations highlighted the need for a combination of size limits, quota reductions as well as the protection of spawning stocks. Genetic population connectivity patterns of H. actiniformis revealed significant genetic structuring, both among populations in South Sulawesi and throughout the Indo-Malay Archipelago. At both scales the degree of geographic separation and oceanographic features influenced the degree of larval exchange, with historical influences additionally shaping patterns on the large scale
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
Economic and labour market implications of climate change on the fisheries sector of the Maltese Islands
Get PDFClimate change has been predicted to have
large and rapid impacts on the Mediterranean Sea. Impacts
of increasing mean annual sea temperatures, more
extreme climatic events and changes in oceanographic
parameters will a ffect the distribution, productivity and
resilience of commercially targeted stocks. This study
uses data on the Maltese fi shing industry, collected
through the EU fi sheries data collection system by the
Government of Malta, to develop our understanding of
how climate change may impact the Maltese fi sheries
sector. The most important
fleet segment contributing
to the overall productivity of the Maltese fishing industry,
both in terms of total biomass landed and total
generated income, was comprised of vessels using hooks
in 2009-2011. These vessels mainly used drifting surface
longlines to target large pelagic species. In 2011, this
fleet segment accounted for the largest number of full
time employment positions, and was the most important
fleet segment in terms of total investment. Available
information on species targeted by this
fleet segment
suggests that the impact of climate change may in
fact be positive. However, limited information is available
on stock status as well as on the potential impacts
of climate change on several important target species
such as sword sh, dolphin sh and blue n tuna. In order
to ensure the continued competitiveness of the Maltese
fishing
fleet in light of this uncertain situation, it is suggested
that an emphasis is placed on ensuring that the
industry is
flexible and able to eff ectively market and
promote new products as and when they emerge. This
could be achieved by developing fi shers' skills accordingly,
and placing an emphasis on diversifying activities.peer-reviewe
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