Search results for "Ocells"
showing 10 items of 18 documents
A Migratory Divide Among Red-Necked Phalaropes in the Western Palearctic Reveals Contrasting Migration and Wintering Movement Strategies
2019
Publisher's version (útgefin grein)
The roles of temperature, nest predators and information parasites for geographical variation in egg covering behaviour of tits (Paridae)
2020
Abstract Aim: Nest building is widespread among animals. Nests may provide receptacles for eggs, developing offspring and the parents, and protect them from adverse environmental conditions. Nests may also indicate the quality of the territory and its owner and can be considered as an extended phenotype of its builder(s). Nests may, thus, function as a sexual and social signal. Here, we examined ecological and abiotic factors—temperature, nest predation and interspecific information utilization—shaping geographical variation in a specific nest structure—hair and feather cover of eggs—and its function as an extended phenotype before incubation in great (Parus major) and blue tits (Cyanistes …
The flight feather moult pattern of the bearded vulture (Gypaetus barbatus)
2015
Moult is an extremely time-consuming and energy-demanding task for large birds. In addition, there is a trade-off between the time devoted to moulting and that invested in other activities such as breeding and/or territory exploration. Moreover, it takes a long time to grow a long feather in large birds, and large birds that need to fly while moulting cannot tolerate large gaps in the wing, but only one or two simultaneously growing feathers. As a consequence, large birds take several years to complete a full moult cycle, and they resume the moult process during suboptimal conditions. A clear example of this pattern is the Bearded Vulture (Gypaetus barbatus), which needs 2-3 years for chang…
Winter movement patterns of a globally endangered avian scavenger in south-western Europe
2020
AbstractPartial migration, whereby some individuals migrate and some do not, is relatively common and widespread among animals. Switching between migration tactics (from migratory to resident or vice versa) occurs at individual and population levels. Here, we describe for the first time the movement ecology of the largest wintering population of Egyptian Vultures (Neophron percnopterus) in south-west Europe. We combined field surveys and GPS tracking data from December to February during four wintering seasons (2014–2018). The wintering population consisted on average of 85 individuals (range 58–121; 76% adults and 24% subadults). Individuals were counted at five different roosting sites lo…
Populations of breeding birds in Byers Peninsula, Livingston Island, South Shetland Islands
2013
Data about breeding populations of birds in the Antarctica are rare and fragmented. Thus, information about the status of the breeding populations of Antarctic birds is crucial given the current scenario of climate change, which is particularly acute in Antarctica. This paper presents new information about the populations of the Antarctic tern Sterna vittata, the kelp gull Larus dominicanus, the southern giant petrel Macronectes giganteus, the Antarctic skua Catharacta antarctica lonnbergi, the chinstrap penguin Pygoscelis antarctica and the gentoo penguin Pygoscelis papua on Byers Peninsula (Livingston Island, South Shetland Islands). We used line transects counts to estimate both densitie…
Influence of Galvanic Microcells on Growth of Pathogenic Bacteria and Candida Yeast
2017
The aim of the study was to evaluate the influence of electrodes on growth of pathogenic bacteria and Candida albicans yeast. In the study, following references bacteria strains were used: Staphylococcus aureus ATTC 6538; Enterococcus faecalis ATTC 29212 (V); Enterococcus hirae ATTC 105441 (VI) and yeast strain Candida albicans ATTC 10231 (C40). Microelectrodes were prepared by ALCOR Center. Estimation of the biocidal effect of electrodes was carried out by medium poisoning method. The assessment of adhesion to the surface was performed by a modified Hawser’s method. Presence of adhesion was assessed by SEM analysis. The highest inhibition zones were obtained for Staphylococcus aureus ATTC …
La cetrería en los ejemplos, símiles y metáforas de san Vicente Ferrer
2012
Vincent Ferrer used in his sermons many and varied resources to make your message intelligible to its many listeners. One such resource was hunting activities and especially the form of hunting with birds. On the one hand, this activity was provided appropriate elements to construct analogies that facilitate the understanding of the word of God. However, on the other hand, it seems that perhaps other reasons may explain this preference of the speaker, more related to their own experience and the reality of the society to which he was going. And, in addition to the textual sources, father Vincent often drew on his own experience and, indeed, to those aspects of the daily lives of his audienc…
El Llibre de cetreria del vescomte de Rocabertí
2021
Resum: En el present article oferim una edició crítica del Llibre de cetreria, un breu tractat de falconeria escrit en català i conservat en manuscrit únic pertanyent a una col·lecció privada. També n’estudiem l’estructura i el contingut, a més de les relacions amb altres obres de falconeria, especialment les escrites a la Corona d’Aragó. Oferim una hipòtesi sobre la identificació del seu autor i l’època de la composició del tractat. Com que es tracta de l’obra escrita en català que major nombre d’ocells de caça esmenta, a la present edició ens ha semblant oportú de fer una exposició detallada de les aus emprades pels caçadors, com també tota la terminologia que la llengua catalana va desen…
Habitat preferences of the Tawny owl (Strix aluco) in a Special Conservancy Area of eastern Spain.
2020
The Tawny Owl (Strix aluco) is the most abundant nocturnal raptor in Europe. It has been thoroughly studied in various regions, but its habitat preferences in Mediterranean environments remain poorly understood. With the aim to present novel information about this aspect of the ecology of the Tawny Owl, we established 115 survey stations in the Special Conservancy Area 'Sierras de Talayuelas y Aliaguilla' (Castilla-La Mancha region, eastern Spain) and carried out nocturnal surveys by recording spontaneous calls and vocal responses to call playbacks. We then assessed environmental characteristics (vegetation types, soil type, altitude, potential competitors, and anthropic disturbance) in are…
Variación del peso de los pollos de Carbonero Común (Parus major) tras abandonar el nido.
2002
Durante el periodo 1992-2000 se estudió la variación en el peso de 111 pollos de Carbonero Común (Parus major) desde que se pesaron en el nido el día 15 de vida (D15) hasta la fecha de su recaptura, como máximo un mes y medio más tarde, en un naranjal de Sagunto (Valencia). Los pollos más pesados al abandonar el nido tienden a perder peso, mientras que los más ligeros a ganarlo. Incluso con estos cambios de peso, los pollos más pesados en D15 siguen siéndolo en el momento de su recaptura. Los resultados sugieren que las variaciones en el peso se producen en el nido o pocos días después de abandonarlo.