1,720,975 research outputs found
at a site in east‐central Madagascar
No full textAbstract Population‐level data are urgently needed for amphibians in light of the ongoing amphibian extinction crisis. Studies focused on population dynamics are not only important for rare species but also for common species which shape ecosystems to a greater degree than those that are rare. Some of the greatest global amphibian species diversity is found in Madagascar, yet there are few studies on the ecology of frog species on the island. We carried out a mark‐recapture study on the widespread frog Mantidactylus betsileanus (Mantellidae: Mantellinae: Mantidactylus ) at two adjacent rainforest sites in east‐central Madagascar to assess its population size and structure. To do so, we validated and implemented an individual identification protocol using photographs of the ventral patterns of frogs and identified individuals with photographic‐matching software. Using this rapid, non‐invasive survey method, we were able to estimate a density of 26 and 28 frogs per 100 m 2 at each of the two sites sampled. Our results show the rainforests near the village of Andasibe, Madagascar support remarkably high amphibian abundance, helping illustrate the significant ecological role of frogs in this ecosystem. Further, individual frog markings allowed us to develop more precise estimates than traditional survey methods. This study provides a blueprint to augment existing population studies or develop new monitoring programs in Madagascar and beyond
FIGURE 1 in Beautiful bright belly: A distinctive new microhylid frog (Amphibia: Stumpffia) from eastern Madagascar
No full textFIGURE 1. Stumpffia kibomena sp. nov. in life, in dorsolateral and ventral view, respectively. (A–B) One or two individuals (not collected) from Andasibe used for DNA sequencing (photos: D. Edmonds); (C–D) female specimen from An'Ala (photos: F. Glaw); (E–F) male paratype NMBE 1034211 from near Andasibe (photos: D. Vallan).Published as part of Glaw, Frank, Vallan, Denis, Andreone, Franco, Edmonds, Devin, Dolch, Rainer & Vences, Miguel, 2015, Beautiful bright belly: A distinctive new microhylid frog (Amphibia: Stumpffia) from eastern Madagascar, pp. 120-128 in Zootaxa 3925 (1) on page 122, DOI: 10.11646/zootaxa.3925.1.8, http://zenodo.org/record/23352
FIGURE 3 in A new species of the Spinomantis bertini species complex (Anura: Mantellidae) from Pic d'Ivohibe Special Reserve (Madagascar)
No full textFIGURE 3. Lateral and ventral views of the female paratypes UADBA-A 61668 (ZCMV 14752) (A−B), and ZSM 817/2014 (ZCMV 14753) (C−D) of Spinomantis mirus sp. nov. from Pic d'Ivohibe in life.Published as part of Sabino-Pinto, Joana, Rakotoarison, Andolalao, Bletz, Molly C., Edmonds, Devin, Glaw, Frank & Vences, Miguel, 2019, A new species of the Spinomantis bertini species complex (Anura: Mantellidae) from Pic d'Ivohibe Special Reserve (Madagascar), pp. 133-142 in Zootaxa 4656 (1) on page 138, DOI: 10.11646/zootaxa.4656.1.6, http://zenodo.org/record/336679
FIGURE 1. A in A new species of the Spinomantis bertini species complex (Anura: Mantellidae) from Pic d'Ivohibe Special Reserve (Madagascar)
No full textFIGURE 1. A) Maximum Likelihood phylogenetic tree based on 435 base pairs of the mitochondrial 16S rRNA gene depicting relationships within the Spinomantis bertini complex. Numbers at nodes are percentages of bootstrap pseudoreplicates. Grey shading marks the new species. The inset map shows approximate location of the collecting sites of specimens represented in the tree. Scale bar in substitutions per site. Adapted from Vences et al. (2017). B) Haplotype networks reconstructed from DNA sequences of the nuclear genes KIAA1239 (left) and RAG-1 (right), for the three named species of the S. bertini complex.Published as part of Sabino-Pinto, Joana, Rakotoarison, Andolalao, Bletz, Molly C., Edmonds, Devin, Glaw, Frank & Vences, Miguel, 2019, A new species of the Spinomantis bertini species complex (Anura: Mantellidae) from Pic d'Ivohibe Special Reserve (Madagascar), pp. 133-142 in Zootaxa 4656 (1) on page 136, DOI: 10.11646/zootaxa.4656.1.6, http://zenodo.org/record/336679
Year-round activity patterns in a hyperdiverse community of rainforest amphibians in Madagascar
No full textFigure 4. Canonical correspondence biplot relating amphibian species abundance along the study transect and five environmental predictors (italics, labelled as in Figure 3). Circles identify the sampling units (days) and crosses identify species. Species occurring more frequently at extreme environmental conditions are labelled using the codes presented in Table 1.Published as part of Heinermann, Janosch, Rodríguez, Ariel, Segev, Ori, Edmonds, Devin, Dolch, Rainer & Vences, Miguel, 2015, Year-round activity patterns in a hyperdiverse community of rainforest amphibians in Madagascar, pp. 2213-2231 in Journal of Natural History 49 (33) on page 2225, DOI: 10.1080/00222933.2015.1009513, http://zenodo.org/record/400179
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
Figure 2 in Year-round activity patterns in a hyperdiverse community of rainforest amphibians in Madagascar
No full textFigure 2. Annual variation of relative abundance in eight species with more than 100 individual observations along the study transect. Note different activity patterns displayed by the species, some active year round (M. grandidieri), some restricted to the warm/rainy season (A. madagascariensis, B. pyrrhus), some active year round but with a clear peak in the late cold/dry season (B. viridis) or early dry season (Heterixalus spp.), and P. palmata showing an extremely seasonal, explosive breeding activity. The asterisk in the plot for P. palmata indicates the massive breeding of the species when the number of individuals was uncountable and estimated as 100.Published as part of <i>Heinermann, Janosch, Rodríguez, Ariel, Segev, Ori, Edmonds, Devin, Dolch, Rainer & Vences, Miguel, 2015, Year-round activity patterns in a hyperdiverse community of rainforest amphibians in Madagascar, pp. 2213-2231 in Journal of Natural History 49 (33)</i> on page 2220, DOI: 10.1080/00222933.2015.1009513, <a href="http://zenodo.org/record/4001793">http://zenodo.org/record/4001793</a>
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
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