Search results for "Ornitologia"
showing 7 items of 7 documents
Tri-axial accelerometry shows differences in energy expenditure and parental effort throughout the breeding season in long-lived raptors
2021
Cutting-edge technologies are extremely useful to develop new workflows in studying ecological data, particularly to understand animal behavior and movement trajectories at the individual level. Although parental care is a well-studied phenomenon, most studies have been focused on direct observational or video recording data, as well as experimental manipulation. Therefore, what happens out of our sight still remains unknown. Using high-frequency GPS/GSM dataloggers and tri-axial accelerometers we monitored 25 Bonelli’s eagles Aquila fasciata during the breeding season to understand parental activities from a broader perspective. We used recursive data, measured as number of visits and resi…
Individual-Based Tracking Systems in Ornithology: Welcome to the Era of Big Data
2016
Technological innovations have led to exciting fast-moving developments in science. Today, we are living in a technology-driven era of biological discovery. Consequently, tracking technologies have facilitated dramatic advances in the fundamental understanding of ecology and animal behaviour. Major technological improvements, such as the development of GPS dataloggers, geolocators and other bio-logging technologies, provide a volume of data that were hitherto unconceivable. Hence we can claim that ornithology has entered the era of big data. In this paper, which is particularly addressed to undergraduate students and starting researchers in the emerging field of movement ecology, I summaris…
Differential survival throughout the full annual cycle of a migratory bird presents a life‐history trade‐off
2021
1. Long‐distance migrations are among the most physically demanding feats animals perform. Understanding the potential costs and benefits of such behaviour is a fundamental question in ecology and evolution. A hypothetical cost of migration should be outweighed by higher productivity and/or higher annual survival, but few studies on migratory species have been able to directly quantify patterns of survival throughout the full annual cycle and across the majority of a species’ range. 2. Here, we use telemetry data from 220 migratory Egyptian vultures Neophron percnopterus, tracked for 3,186 bird months and across approximately 70% of the species’ global distribution, to test for differences …
Adult coloration of the Bearded Vulture (Gypaetus barbatus) in the Pyrenees: relation to sex, mating system and productivity.
2021
Cosmetic coloration is not a common phenomenon among bird species. Adult Bearded Vultures Gypaetus barbatus typically show orange coloration in head, chest, belly and tarsus feathers that is the result of mud baths in ferruginous substrates. Several non-mutually exclusive visual signalling hypotheses can be proposed to explain this phenomenon. Coloration could be used to signal: (1) dominance towards conspecifics, with darker birds being dominant (status signalling hypothesis); (2) sex (gender signalling hypothesis) because females are usually more intensely coloured; (3) individual quality for mate choice (quality signalling hypothesis); or (4) different reproductive strategies between ind…
Un caso de nidificación de Alcaudón Dorsirrojo Lanius collurio en la provincia de Cuenca
2001
En la presente nota se describe la localización de un nido de esta especie en la Cañada Lagosa, en el término municipal de Valdemeca (Cuenca).
Nuevas aves nidificantes en la provincia de Castellón
2000
Desde la publicación del Atlas de las Aves Nidificantes en la Comunidad Valenciana (URIOS et al., 1991) se han producido cambios importantes del estatus de muchas de las aves. Algunas especies que no fueron encontradas durante la realización del trabajo de campo de dicho atlas, se reproducen actualmente en diversas localidades. Se aportan datos acerca de 18 nuevas especies nidificantes en la provincia de Castellón, actualizando su situación y distribución. Los datos provienen tanto de búsquedas específicas de algunas de las especies, como de censos periódicos en diversas áreas y de comunicaciones personales o citas publicadas recientemente. Las especies nuevas para Castellón son: el Somormu…
Nidificación de Gorrión Común (Passer domesticus) en una grúa móvil
1996
Es va trobar un niu de pardal comú situat a una grua d'una nau industrial el qual es movia contínuament distàncies de fins a 75 m. El moviment del niu no va afectar l'èxit reproductor dels pardals, els quals van alimentar els polls amb tota normalitat. Aquest lloc tan inusual d'ubicació del niu i d'altres casos publicats són exemples de l'alta adaptabilitat de l'espècie cap a indrets força humanitzats. -- A House Sparrow nest was found situated in a factory crane, which was continually moving distances of nearly 75 m. The movement of the nest did not affect the breeding success of the sparrows, which fed the nestlings normally This unusual nest site and other cases reported in the literatur…