Suchergebnisse

A data logger devised and manufactured by our research team in order to study the homing routes of carrier pigeons was subsequently modified to study the homing behaviour and foraging strategies of breeding marine birds. Recent versions of the data logger, equipped with a flight sensor and depth meter or saltwater switch, were used in a study of the foraging strategies of chick-rearing Balearic shearwaters (Puffinus mauretanicus) in the framework of the project LIFE-Puffinus financed by the Balearic Government and the EU. Due to low recapture rates (only 3 out of 6 tagged birds were recovered), only preliminary data from a small sample are available. Data loggers have recorded data on the pattern of nest attendance (including departure time to foraging trips and return time) and the diurnal pattern of flight and dive activity (including depth and duration of dives). Despite the small sample size, the results show that our data loggers can successfully be applied to the study of the breeding biology and foraging ecology-including the diving pattern-of Balearic shearwaters and similar species. ; Un dispositivo electrónico diseñado y producido por nuestro equipo de investigación con la finalidad de estudiar las rutas de vuelo de palomas mensajeras ha sido adaptado al uso en investigación de la conducta de nidificación y estrategias de alimentación en aves marinas. Versiones mejoradas del aparato, equipado con un sensor de vuelo, y un profundímetro (o bien un sensor de agua marina) se han utilizado para el estudio de las estrategias de alimentación de individuos reproductores de la pardela balear (Puffinus mauretanicus), en el marco del proyecto LIFEPuffinus financiado por el Govern de les Illes Balears y la UE. Disponemos únicamente de datos preliminares, debido al pequeño tamaño de la muestra, ya que sólo se recuperaron tres de los seis aparatos colocados sobre las aves. Los data-loggers han proporcionado información sobre el modelo de permanencia en el nido (incluyendo los horarios de salidas y entradas ), la distribución diaria de las actividades de vuelo y buceo, así como la profundidad y duración de las zambullidas. A pesar del pequeño tamaño de la muestra, nuestros resultados sugieren que este tipo de data logres puede utilizarse en estudios de conducta de nidificación y alimentación de aves de la talla de la pardela balear, incluyendo el estudio del modelo de buceo.

An economically important, small-scale fishery operates during the winter months in Mallorca. Using a special surrounding net that is hauled over the sand and gravel bottoms of bays at depths reaching 30 m, it primarily targets Aphia minuta and Pseudaphya ferreri, but other goby species and juveniles of the Pagellus spp are also caught. Similar fisheries are operated on the Spanish coast and in Italy. This fishery is run with specific licenses, equipment controls, and closed seasons (based on species availability). In cooperation with local fishermen, the administration has in recent years established a daily quota for sustaining the sales prices 22of the species caught. A management plan was set up in 2013 in accordance with European Union rules to ensure the sustainability of the fishery. Its sustainable quotas have been set at 30 kg/day/boat for A. minuta and 50 kg/day/boat for P. ferreri, and the by-catch cannot exceed 10% of the total catch. Landings are permitted in 11 fixed ports and only 35 boats can fish with the regulated nets from December 15 to April 30. A co-management committee was created with the participation of the public administration, fishermen's associations, researchers, and certain non-governmental organizations. The co-management process was revised and fishermen's opinions were obtained in a successful enquiry that was answered by the majority of the operating fleet, and their views on the management rules will be considered in future regulations. The co-management of the small-scale boat seine fishery in the Balearic Islands is thus an ongoing collaborative and communicative process in a local community that continues to evolve over time. Although the fishermen are represented by their port guilds, communication efforts are necessary in the near future to ensure the success of the co-management process. ; This research was supported by the H2020 REA 634495-MINOUW Project ; Peer reviewed