1,721,098 research outputs found
Comportamento alimentare del gabbiano reale mediterraneo (Larus cachinnans) nidificante in ambito urbano
No full textThe feeding behaviour and the composition of prey fed to Larus cachinnans nestlings was investigated for a period of three years in an urban environment. We visited 45 nests on 40 different buildings and examined the crop regurgitations of each young gull, keeping note of any other food around the nests. The foraging behaviour of adult gulls was scored in the urban environment with linear transects randomly choiced (200 hours of observation). The composition of the diet was of anthropic origins and the presence of typical herring gull’s prey like fishes and mussels was not significative. It was possible to observe a social transmission of information (Local Enhancement of Attention) related to the utilization of food resources.[...
Secondary imprinting in the domestic chick: Binocular and lateralized monocular performance
No full text“Ultrasound investigation of abdominal organs in the eurasian buzzard(Buteo buteo)”
No full textUltrasound is an investigation imaging technique routinely performed in mammal medicine. In the avian patient the aerodynamic anatomy of the body with the presence of the air sacs makes this diagnostic tool a challenging investigations technique to perform. However, several organs can be visualized and checked in the abdomen of the bird, like the liver, the spleen, the proventriculus, the gizzard, the intestinal tracts, the cloaca and sometimes the kidneys and the gonads. In this work ultrasound investigation of the abdominal organs was performed on 6 healthy specimens of Eurasian Buzzard (Buteo buteo). The aim of this study was to obtain standard imagines of the abdominal organs in these specie of raptors and to gain knowledge regarding the normal appearance of coelomic ultrasound imagines in the avian patient.
. The main acoustic window used was the liver and with this trans-abdominal approach it was not necessary to remove any feather. Abdominal organs of the raptors were observed and checked regarding their shape, their content and their echogenic appearance. The liver is, at the present knowledge, the easiest organ to be investigated: it appears well divided in lobes and its echogenic imagine pattern is similar to the one of mammals. The proventriculus and the gizzard can be visualizes both empty or filled with water previously given by forced feeding (20 ml/bird half an hour before the investigation). The gut was seen with occurring peristalsis. The cloaca was very interesting to observe: it appears usually filled with echogenic feaces and not echogenic urates. Sometimes it is possible to see the urates and feaces passing from urinary and intestinal tract to the cloaca. The kidneys are still challenging organs to check, although parts of can be seen both with trans-hepatic or lateral approach.
Although ultrasound investigation in avian medicine it is still in its infancy, this imagine technique, so challenging in such an aereodynamics patient could really be a powerful diagnostic tool
Posture in ovo as a precursor of footedness in ostriches (Struthio camelus)
No full textTwo categories of behaviour involving lateralized posture were observed in semi-natural conditions in ostriches (Struthio camelus). Observing preferences for left or right foot, both in the forward foot posture (the foot standing in front at rest) and the starting foot used to initiate locomotion, a population-level right-foot preference was shown for the whole group and for each of the three age ranges considered (chick, young and adult). Ostriches are known to rely upon a lateralized behaviour during hatching (using their right foot to break the egg shell) suggesting the hypothesis that the precocious motor laterality observed at hatching might stand as a precursor of limb preference later in development, as already observed in other avian species
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
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
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