1,721,001 research outputs found
Reproductive phenology in a Neotropical aquatic snake shows marked seasonality influenced by rainfall patterns
No full textGarcía-Cobos, Daniela, Crawford, Andrew J., Ramírez-Pinilla, Martha Patricia (2021): Reproductive phenology in a Neotropical aquatic snake shows marked seasonality influenced by rainfall patterns. Journal of Natural History 54 (29-30): 1845-1862, DOI: 10.1080/00222933.2020.1829724, URL: http://dx.doi.org/10.1080/00222933.2020.182972
Figure 1 in Reproductive phenology in a Neotropical aquatic snake shows marked seasonality influenced by rainfall patterns
No full textFigure 1. Habitat of Helicops pastazae in the Bata River. (a) Map locating the studied population of H. pastazae. (b) Adult female of H. pastazae. (c) Bata River during the dry season surrounded by rocks and relictual forest. (d) Chivor dam. (e) Discharge of the water dam of Chivor. Photographs A-D by Diego A. Gómez-Sánchez, and photograph E by Adrian Pinzón.Published as part of García-Cobos, Daniela, Crawford, Andrew J. & Ramírez-Pinilla, Martha Patricia, 2021, Reproductive phenology in a Neotropical aquatic snake shows marked seasonality influenced by rainfall patterns, pp. 1845-1862 in Journal of Natural History 54 (29-30) on page 1848, DOI: 10.1080/00222933.2020.1829724, http://zenodo.org/record/502856
FIGURE 5 in Fantastic lizards and where to find them: cis-Andean microteiids (Squamata: Alopoglossidae & Gymnophthalmidae) from the Colombian Orinoquia and Amazonia
No full textFIGURE 5. External morphology of one representative for the examined specimens of Alopoglossidae. Alopoglossus atriventris (IAvH-R-3093), Alopoglossus avilapiresae (IAvH-R-0314), Alopoglossus bicolor (IAvH-R-7161), Alopoglossus brevifrontalis (IAvH-R-8495), Alopoglossus buckleyi (IAvH-R-4886). Individual photographs for each specimen in the figure are available in the Supplementary Files.Published as part of Diago-Toro, María F., García-Cobos, Daniela, Brigante-Luna, Giovanni D. & Vásquez-Restrepo, Juan D., 2021, Fantastic lizards and where to find them: cis-Andean microteiids (Squamata: Alopoglossidae & Gymnophthalmidae) from the Colombian Orinoquia and Amazonia, pp. 377-400 in Zootaxa 5067 (3) on page 383, DOI: 10.11646/zootaxa.5067.3.3, http://zenodo.org/record/568191
Neusticurus medemi Dixon & Lamar 1981
No full textNeusticurus medemi Dixon & Lamar, 1981 Distribution: In the Amazonian region of Colombia and Venezuela. In Colombia in the eastern of Caquetá department, Guaviare, Vaupés and likely Guainía (Fig. 4C). Similar species: This species may be confused with Gelanesaurus spp. and Potamites ecpleopus for their external resemblance, being distinguishable in having small irregular scales not forming ridges (enlarged or tubercular dorsal scales forming longitudinal ridges in Gelanesaurus spp. and P. ecpleopus).Published as part of Diago-Toro, María F., García-Cobos, Daniela, Brigante-Luna, Giovanni D. & Vásquez-Restrepo, Juan D., 2021, Fantastic lizards and where to find them: cis-Andean microteiids (Squamata: Alopoglossidae & Gymnophthalmidae) from the Colombian Orinoquia and Amazonia, pp. 377-400 in Zootaxa 5067 (3) on page 387, DOI: 10.11646/zootaxa.5067.3.3, http://zenodo.org/record/568191
Loxopholis caparensis
No full textLoxopholis caparensis (Esqueda, 2005) Distribution: Known only from the Venezuelan and Colombian plains, in the Orinoco River basin (Esqueda 2005; Sánchez-Pacheco et al. 2016). In Colombia from the Arauca department in the northernmost Orinoquia (Fig. 4D). Similar species: Currently, Loxopholis caparensis seems to have an allopatric distribution from other cis-Andean species of the genus. However, it can be differentiated from all the other eastern species of Loxopholis in Colombia in having smooth or weakly keeled ventral scales (keeled in L. parietalis, L. percarinatum, and L. snethlageae); and rhomboid dorsal scales (hexagonal in L. hexalepis). For a more detailed description see Esqueda (2005).Published as part of Diago-Toro, María F., García-Cobos, Daniela, Brigante-Luna, Giovanni D. & Vásquez-Restrepo, Juan D., 2021, Fantastic lizards and where to find them: cis-Andean microteiids (Squamata: Alopoglossidae & Gymnophthalmidae) from the Colombian Orinoquia and Amazonia, pp. 377-400 in Zootaxa 5067 (3) on page 389, DOI: 10.11646/zootaxa.5067.3.3, http://zenodo.org/record/568191
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 3 in Reproductive phenology in a Neotropical aquatic snake shows marked seasonality influenced by rainfall patterns
No full textFigure 3. Monthly variation in gonadal measurements and reproductive stages versus mean rainfall by month. Striped bars indicate the 4-month dry season. White bars indicate the high-rainfall portion of the wet season and grey bars indicate the low-rainfall portion. (a) Monthly variation in the follicular diameter and reproductive stages in H. pastazae. Dark grey triangles: previtellogenic follicles. Squares: vitellogenic I follicles. Dark grey circles: vitellogenic II follicles. Open circles: females with oviductal eggs. (b) Monthly variation in testicular volume (mm3) and spermatogenic stages. Open circles: Stage 4 (early spermatids at lumen). Gray triangles: stage 5 (transforming spermatids at lumen). Dark grey circles: stage 6 (abundant spermatozoa at lumen). White squares: Stage 7 (testicular regression).Published as part of García-Cobos, Daniela, Crawford, Andrew J. & Ramírez-Pinilla, Martha Patricia, 2021, Reproductive phenology in a Neotropical aquatic snake shows marked seasonality influenced by rainfall patterns, pp. 1845-1862 in Journal of Natural History 54 (29-30) on page 1852, DOI: 10.1080/00222933.2020.1829724, http://zenodo.org/record/502856
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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