1,720,976 research outputs found
Pheasant (Phasianus colchicus) hens of different origin. Dispersion and habitat use after release
No full textBecause of the importance of pheasants as a game bird species in many European Countries, information on the success of the restocking programs is interesting for evaluation. For this reason the survival, behaviour and habitat selection of 10 wild translocated and 20 released ring-necked pheasants (10 offspring of wild captured and 10 from the farmed strain, both farm-reared) was studied using radio-telemetry during March-August (fixes were grouped in 3 categorized periods: March 2 - April 18; April 19 - May 28; May 29 - August 16). All the captive reared pheasants were reared according to the new disciplinary rules set forth by the Toscana region for the production of pheasants destined to be released in the wild as part of a game repopulation program. The study was carried out in a hilly area of the Tuscany characterised by 18.1% woodland (core: 1654895E, 4850468N). Results showed that live weights were higher in the farm-reared pheasants (either directly captured or offspring of the captured, P<0.05). The tarsus length statistically differed between the farmed offspring of the captured pheasants and the farm strain (P<0.05). The survival rates and breeding success of the surviving subjects were very high and did not differ between groups (survival rates: 50.0%, 70.0% and 80.0%, and breeding success: 60.0%, 28.6% and 50.0%, for the captive-reared offspring of captured wild pheasants, the captive-reared farm pheasants and the captured wild pheasants, respectively). The dispersion increased with time in the wild translocated pheasants (576 m, 889 m and 1209 m) while the offspring of the captured wild pheasants and the farm strain remained in the vicinity of the releasing site. The wild pheasants showed an increasing distance from the country houses, contrary to the offspring of captured wild pheasants and the farm strain. Artificial feeding stations were better used by the farm-reared pheasants, which remained in the vicinity of the artificial feeding points. The results of our study showed that pheasants, reared according to the disciplinary rules stated for the production of pheasants for wildlife reproduction programs, although more expensive, can guarantee the genetic identity with the resident populations and are able to provide good survival rates and breeding success of the released pheasants, of course when restocking is carried out in areas suitable for pheasant wildlife
Survival Rates of Radiotagged Red-Legged Partridges (Alectoris Rufa L.), Captive Reared by Parents or Artificially Hatched and Brooded
No full textThe survival rates of redlegged partridges artificially hatched and brooded (Incubator) or naturally hatched and brooded by their own parents in small flying pens (Parents), were evaluated in 28 radiotagged redlegged partridges. Results showed that all the partridges of the group Incubator deceased within 80 days after release and only 4 partridges (28.5%) of the group Parents were still alive after 100 days from their release in the wild. Other raising and/or adapting techniques must be studied and tested in the field to improve survival rates
Habitat use and home range traits of resident and relocated hares (Lepus europaeus, Pallas)
No full textThe aim of the study was to know the habitat preferences and home range of resident and relocated brown hares during the no hunting period.
The trial was carried out in a protected area (PA) and in a free hunting territory (FHT), both located in Florence province. During captures 21 hares were equipped with a necklace radio tag: 7 hares, resident group, were released in the same area of capture and 14 hares, relocated group, were relocated in six different locations within the FHT. The effect of place of release was analyzed by ANOVA and/or non parametric methods.
Results showed that the home ranges of the resident group were characterised by a greater presence of fallow land and shrub land than relocated group (P< 0.05). Home range sizes and Max distances from the releasing sites were greater in the relocated group. Resident hares preferred landscape characterized by a higher density of patches (152 vs. 70 n/100ha), patch richness (43 vs. 12 n/100ha), and patches area (4703 vs. 8142 sq.m) than the relocated hares (P<0.01). The landscape structure indexes, the home range sizes and the maximum distance from the releasing sites suggest that the relocated hares even if released in suited habitats, will move from their releasing point to look for better habitats. Landscape with most complexity are preferred from the resident hare, and this result should be consider when a project to reintroduction of this lagomorph in a territory is programmed, or when it is necessary to improve the dynamic of a natural population
Valutazione dello stress da cattura nelle lepri (Lepus Europaeus Pallas)
No full textThe research was carried out during the capture of the hares. Sixty-six hares (experimental group), coming from fourteen different protected areas of Central Italy, were subjected to blood drawing, control of body temperature, hearth and respiratory rate. The same parameters were contemporaneously obtained from ten hares (about one year old)born and reared in cages and, therefore, with a reduced man-fear (control group). Blood samples (plasma) were analysed for glucose, AST (GOT), ALT (GPT), CK and cortisol concentrations.
Results showed that the hares reared in cages presented the highest value of glucose while the wild captured hares showed the lowest value (222mg/dl vs. 153mg/dl, P<0.05). These differences were explained by the runs and the escape-attempts during the captures which causes a strong depletion of carbohydrate resources. The level of AST and respiratory rate resulted higher in females than in males. CK, indicator of muscle damage (myopathy), resulted higher in captured hares.
The results obtained during the sanitary monitoring showed that most of captured hares, showing values of glucose and CK differing from the control reared hares, are stressed and, consequently have different potential survivals after traslocation. The pain could probably cause different categories of capture myopathy (peracute, acute, sub-acute and chronic myopathy) which can be graded by the determination of CK and AST
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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