1,720,957 research outputs found
Temperature effects on parental care behaviour in native and invasive Palaemon shrimp species
Full text linkEnvironmental changes and the spread of non-native species significantly affect wetland ecosystems, such as coastal lagoons. This study investigates the effects of increased temperature on parental care behaviour, specifically pleopod fanning, in ovigerous females of the following three Palaemon species: the global invader Palaemon macrodactylus and the Mediterranean native Palaemon elegans and Palaemon adspersus. Under controlled laboratory conditions, we measured pleopod beats per minute across a temperature gradient to assess species-specific responses. Our results showed significant inter-species differences in fanning behaviour, with P. elegans exhibiting the lowest pleopod beat rate overall. Temperature showed a strong positive correlation with pleopod beats across all species, whereas dissolved oxygen negatively correlated with pleopod beats in P. adspersus and P. macrodactylus. Interestingly, P. elegans exhibited a unique response compared with its congeneric species, because it was the only species among those studied that did not show a negative correlation between pleopod beat rate and dissolved oxygen concentration. These findings have enhanced our understanding of the behavioural responses of native and invasive Palaemon species to environmental alterations, providing valuable insights into how species interact with their changing environments
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
The role of salinity in shaping the early life stages of Aphanius fasciatus
Full text linkSalinity is a key environmental factor shaping the physiology, reproduction, and survival of estuarine and coastal fish species. Aphanius fasciatus, a euryhaline killifish inhabiting Mediterranean transitional water ecosystems, is listed in Annex II of the European Habitat Directive due to its ecological significance. Although highly tolerant to salinity fluctuations, its presence in oligohaline waters is limited. This study investigates the effects of salinity on A. fasciatus reproductive and early developmental stages by assessing (1) egg deposition rates, (2) hatching success across a salinity gradient, (3) egg mortality across a salinity gradient, and (4) larval survival probabilities. Results revealed that egg mortality is statistically higher and fry survival rate statistically lower in oligohaline conditions. Our findings contribute to understand how salinity influences reproductive success and early-stage survival, providing valuable insights into the species' ecological resilience. This knowledge is essential for conservation strategies in transitional waters, where salinity fluctuations are intensified by climate change. The discussion supports the use of ecological systems modelling as a valuable tool for studying and managing complex systems, such as transitional aquatic environments
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
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