1,721,034 research outputs found
Figure 3. a, linear discriminant function illustrating shape variation between iguanids. Kernel density ellipses for each species illustrate 90 in Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus
No full textFigure 3. a, linear discriminant function illustrating shape variation between iguanids. Kernel density ellipses for each species illustrate 90% and 70% of the data distribution. b, graph of morphometric trait loadings from LD analysis.Published as part of Berry, Kate A, Muñoz-Pérez, Juan Pablo, Vintimilla-Palacios, Cristina P & Clemente, Christofer J, 2021, Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus, pp. 68-80 in Biological Journal of the Linnean Society 133 (1) on page 73, DOI: 10.1093/biolinnean/blab002, http://zenodo.org/record/781794
Figure 1. a in Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus
No full textFigure 1. a, morphological measurements and landmarks used in video digitization. Also illustrated are the three movements of the femur relative to the pelvis including (b) femur protraction, (c) femur rotation and (d) femur adduction (Supporting Information, Table S15).Published as part of Berry, Kate A, Muñoz-Pérez, Juan Pablo, Vintimilla-Palacios, Cristina P & Clemente, Christofer J, 2021, Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus, pp. 68-80 in Biological Journal of the Linnean Society 133 (1) on page 70, DOI: 10.1093/biolinnean/blab002, http://zenodo.org/record/781794
Figure 4. a, linear regression illustrating the relationship between log10 stride length and log10 stride speed. b in Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus
No full textFigure 4. a, linear regression illustrating the relationship between log10 stride length and log10 stride speed. b, linear regression illustrating the relationship between and log10 stride frequency and log10 stride speed for iguanids.Published as part of Berry, Kate A, Muñoz-Pérez, Juan Pablo, Vintimilla-Palacios, Cristina P & Clemente, Christofer J, 2021, Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus, pp. 68-80 in Biological Journal of the Linnean Society 133 (1) on page 73, DOI: 10.1093/biolinnean/blab002, http://zenodo.org/record/781794
Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus
No full textBerry, Kate A, Muñoz-Pérez, Juan Pablo, Vintimilla-Palacios, Cristina P, Clemente, Christofer J (2021): Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus. Biological Journal of the Linnean Society 133 (1): 68-80, DOI: 10.1093/biolinnean/blab002, URL: https://academic.oup.com/biolinnean/article/133/1/68/617914
Figure 5. a in Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus
No full textFigure 5. a, LD function for variation in stride kinematics between iguanids, two of the fastest runs for each individual were retained (marine iguana N = 65, black spiny-tailed iguana N = 35, green iguana N = 22). Kernel density ellipses for each species illustrate 90% and 70% of the data distribution. b, loadings for iguanid stride kinematics in (a). c, LD function for variation in stride kinematics between subspecies of marine iguana. d, Loadings for iguanid stride kinematics in (c).Published as part of Berry, Kate A, Muñoz-Pérez, Juan Pablo, Vintimilla-Palacios, Cristina P & Clemente, Christofer J, 2021, Morphological and performance modifications in the world's only marine lizard, the Galápagos marine iguana, Amblyrhynchus cristatus, pp. 68-80 in Biological Journal of the Linnean Society 133 (1) on page 74, DOI: 10.1093/biolinnean/blab002, http://zenodo.org/record/781794
The evolution of bipedal running in lizards suggests a consequential origin may be exploited in later lineages
No full textThe origin of bipedal locomotion in lizards is unclear. Modeling studies have suggested that bipedalism may be an exaptation, a byproduct of features originally designed to increase maneuverability, which were only later exploited. Measurement of the body center of mass (BCOM) in 124 species of lizards confirms a significant rearward shift among bipedal lineages. Further racetrack trials showed a significant acceleration threshold between bipedal and quadrupedal runs. These suggest good general support for a passive bipedal model, in which the combination of these features lead to passive lifting of the front of the body. However, variation in morphology could only account for 56% of the variation in acceleration thresholds, suggesting that dynamics have a significant influence on bipedalism. Deviation from the passive bipedal model was compared with node age, supporting an increase in the influence of dynamics over time. Together, these results show that bipedalism may have first arisen as a consequence of acceleration and a rearward shift in the BCOM, but subsequent linages have exploited this consequence to become bipedal more often, suggesting that bipedalism in lizards may convey some advantage. Exploitation of bipedalism was also associated with increased rates of phenotypic diversity, suggesting exploiting bipedalism may promote adaptive radiation. © 2014 The Author(s). Evolutio
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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