1,721,182 research outputs found
FIGURE 8 in Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia
No full textFIGURE 8. Juvenile of Xenopholis scalaris (SMF 88380), Arútam, Ecuador. Photo: G. Köhler.Published as part of Jansen, Martin, Álvarez, Lucindo Gonzales & Köhler, Gunther, 2009, Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia, pp. 31-45 in Zootaxa 2222 on page 39, DOI: 10.5281/zenodo.19010
FIGURE 2 in Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia
No full textFIGURE 2. Holotype of Xenopholis werdingorum (MNKR 4700). Photo: A. Schulze.Published as part of Jansen, Martin, Álvarez, Lucindo Gonzales & Köhler, Gunther, 2009, Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia, pp. 31-45 in Zootaxa 2222 on page 34, DOI: 10.5281/zenodo.19010
Spatial distribution of tree and grassland fine roots in an alley cropping system
No full textAlley cropping systems are known as more sustainable land use alternatives compared to monoculture cropland. In addition to the improvement of above-ground structures and creation of biotopes relevant to nature conservation, the improvement of resource development through various root systems plays a major role. We studied the interaction of the root systems in an alley cropping system combining permanent grassland and willows and at a reference grassland site. The system was established 12 years prior to our study on a site with a shallow groundwater table at 130 cm depth. We measured carbon stocks in the topsoil and determined the share of root-bound carbon relative to the total carbon pool and extracted soil cores up to a depth of 150 cm along a distance gradient to the trees and at a reference grassland site with no tree influence. The maximal rooting depth of the grassland roots increased with increasing distance to the tree lines and total root biomass was higher than under the grassland reference up to a distance of 2.5 m from the tree line. Tree roots extended up to a distance of 5.5 m from the trees and we could distinguish zones of tree root dominance very close to the trees, zones of grassland root dominance at distances ≥
8.5 m and an interaction zone in between those two extremes. We conclude that alley cropping increases belowground biomass as compared to grassland and has therefore a higher potential to store carbon in the subsoil.Open-Access-Publikationsfonds 202
FIGURE 1 in Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia
No full textFIGURE 1. Characteristic vertebral morphology in Xenopholis. a) four middle dorsal vertebrae, dorsal view; b) middle dorsal vertebrae, ventral view; c) same, frontal view (X. scalaris, taken from Boulenger 1896).Published as part of Jansen, Martin, Álvarez, Lucindo Gonzales & Köhler, Gunther, 2009, Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia, pp. 31-45 in Zootaxa 2222 on page 33, DOI: 10.5281/zenodo.19010
FIGURE 9 in Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia
No full textFIGURE 9. Xenopholis undulatus (NMB 1865, type of Paroxyrhopus reticularis Schenkel). a) lateral view of midbody; b) dorsal view. Photo: M. Jansen.Published as part of Jansen, Martin, Álvarez, Lucindo Gonzales & Köhler, Gunther, 2009, Description of a new species of Xenopholis (Serpentes: Colubridae) from the Cerrado of Bolivia, with comments on Xenopholis scalaris in Bolivia, pp. 31-45 in Zootaxa 2222 on page 40, DOI: 10.5281/zenodo.19010
FIGURE 6 in Molecular, morphology and bioacoustic data suggest Bolivian distribution of a large species of the Leptodactylus pentadactylus group (Amphibia: Anura: Leptodactylidae)
No full textFIGURE 6. Matrix of genetic pairwise distances of sequences included in this stud (see Table 1): Lkn1: Leptodactylus knudseni (French Guiana; n = 1); Lkn2: Leptodactylus knudseni (Ecuador; n = 2); Lla: Leptodactylus labyrinthicus (Brazil; n = 2); Lrh: Leptodactylus cf. rhodomerus/L. rhodomerus (Ecuador; n = 2); Lsa1: Leptodactylus savagei (Panama; n = 1); Lsa2: Leptodactylus savagei (Costa Rica, Panama, Honduras; n = 4); Lpe: Leptodactylus pentadactylus (Brazil, French Guiana; n = 3); Lpa: Leptodactylus paraensis (Brazil; n = 2); Lva: Leptodactylus vastus (Brazil; n = 2); LvaLL: Leptodactylus vastus (Los Lagos, Bolivia; n = 3); LvaSS: Leptodactylus vastus (San Sebastián, Bolivia; n = 5); Abbreviations in bold indicate own samples.Published as part of Jansen, Martin & Schulze, Arne, 2012, Molecular, morphology and bioacoustic data suggest Bolivian distribution of a large species of the Leptodactylus pentadactylus group (Amphibia: Anura: Leptodactylidae), pp. 35-47 in Zootaxa 3307 (1) on page 44, DOI: 10.11646/zootaxa.3307.1.2, http://zenodo.org/record/525059
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
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
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