1,720,958 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
Home-range e utilizzo del territorio in pernici rosse (Alectoris rufa L.) nate in allevamento e allo stato selvatico
No full textIn Italy several small populations of red-legged partridges has been reconstituted in areas where the species was extinguished. In these areas release of different animals must be programmed, since the dimension of the reconstituted populations does not catch up the minimal dimension required to guard the species from a new extinction. We have thoght therefore indispensable to carry out a research in order to estimate the integration ability of the released raised partridges with the wild population, the survival rates, the use of the habitat and the home-ranges of both populations. In a protected areaf Central Italy 350 raised partridges were released during August month. In January 6 raised partridges and 21 wild partridges has been captured by traps. 6 subjects for each thesis (raised or wild) have been therefore equipped with radio necklaces and localised biweekly until July. No difference in mortality rates was observed between wild or raised partridges that had survived to the winter. Raised partridges, that survive after release in the wild, were able to integrate themselves in mixed brigades with the wild partridges. Vineyards with interlined grass were the habitat most frequented. The distance from the subsidiary artificial feeding points significantly increased during broods showing the necessity to increase the number and dispersion of the supplementary feeders in spring, to help the animals from an alimentary point of view. The distance from the houses and home range surfaces did not differ between wild and raised partridges
How many pheasants (Phasianus colchicus L.) can be removed? A study on small protected areas in Italy
No full textIn Italy the maintenance and the increase of wild pheasant populations is mainly obtained in small-Protected Areas (PA) suitable for wildlife reproduction. In these areas a part of the resident population is regularly captured and transferred to the hunting zones in the winter time. The aim of the study is to determine the right number of pheasant to be removed from this protected area without causing damage and thus maintaining a balance in the resident population. Since 2000, flush counts census were conducted in 30 PAs in the Florence province during the summer time (post-reproduction period), using dogs experienced at rooting out the pheasants. We made estimates for each PA in the number of adult males, adult females and sexually undifferentiated young pheasants. We calculated post-reproduction density and the ratios of young/adults and males/females. These parameters were used to construct a model to predict the pheasants catches in the next winter.The study showed that the minimum census surface covered must be more than 9% of the total area studied. Smaller coverage gave biased estimations of pheasant numbers to be caught. The best generic model, to be used for surfaces between 297 and 1385 ha, located in Mediterranean habitats, was the following: total number of pheasants to be captured and relocated = -10.3 + 0.15*total number of female pheasants estimated in the protected area + 0.14* total number of young pheasants estimated in the protected area + 0.04*total surface of the protected area (R2 = 0.48)
Performance riproduttive in condizioni di cattività di fagiani (phasianus colchicus) di origine selvatica in allevamento
No full textPerformance riproduttive in condizioni di cattività di fagiani (Phasianus colchicus) di origine selvatica e di allevamento
No full textHome-range and land-use in reared and wild red-legged partridges
No full textA research was carried out to estimate the integration ability of the released raised partridges with the wild population, the survival rate, the use of the habitat and the home ranges of both populations. No difference in mortality rates was observed between wild or raised partridges that had survived to the winter. The distance from the houses and home ranges surfaces did not differ between wild and raised
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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