Natura Pitiusa

En el present treball es realitza una descripció geoambiental del sistema dunar d’es Codolar, Eivissa. Aquesta àrea està situada dins l’àrea de Parc Natural de ses Salines d’Eivissa i Formentera (Illes Balears). Aquest sistema platja-duna era desconegut i té la particularitat que es troba desvinculat de la seva font d’alimentació, constituint un veritable mant eòlic. La platja arenosa actualment està coberta per distintes barres de còdols i graves. El sistema dunar, separat de la platja, presenta elevats símptomes regressius, on es pot observar la fragmentació del sistema amb la presència de dos nuclis arenosos independents un de l’altre que en temps pretèrits eren tot un, d’extensió molt superior a l’actual. A més de la descripció geomorfològica també s’incorpora un inventari florístic i una breu discussió sobre les característiques de la vegetació.  Paraules clau: Eivissa, es Codolar, geoambiental, sistema dunar, vegetació. Martín-Prieto, J.Á., Espinosa, J., Roig-Munar, F.X., V

Resumen Se estudia el comportamiento germinativo de tres especies de interés para abordar distintos programas de restauración en sistemas de matorral interior y vegetación litoral. La respuesta germinativa de las especies difirió bajo las dos condiciones de temperatura ensayadas (20ºC y 25/10ºC, 16 horas luz). Brassica repanda (Willd.) DC. subsp. maritima (Willk.) Heywood incrementó su porcentaje de germinación frente a las temperaturas alternantes mientras que Lavandula pedunculata (Mill.) Cav. ofreció resultados similares ante las dos condiciones de temperatura. Silene cambessedesii Boiss. & Reut. fue la única especie que requirió de tratamientos pregerminativos, constatándose la presencia de dormiciones  Fuentes, N. & Estrelles, E.  (2005) Anales de Biología 27

EXECUTIVE SUMMARY The Balearic shearwater has been long considered as a subspecies of either the Manx shearwater Puffinus puffinus or the Yelkouan shearwater Puffinus yelkouan, but was recognised as a distinctive species about ten years ago. As such, this shearwater has been catalogued globally as Critically Endangered following IUCN criteria, on the basis of both its extremely rapid population decline (-7.4% per year) and its small population size, which taken together could lead to the extinction of the species in less than 3 generations (average extinction risk of 40 years). Moreover, the global breeding population is restricted to the Balearic Islands, with an effective breeding range of less than 100 km2 . This alarming situation has led to its inclusion in several international lists and conventions. This action plan updates and revises the previous Species Action Plan (Aguilar 1999), and covers the whole distribution range of the species. The species breeds exclusively in the B

 1. World-wide, many seabirds are affected by fisheries in opposing ways: as a source of mortality from bycatch, but also by providing discards as a predictable and abundant food resource. This applies to the Balearic shearwater Puffinus mauretanicus, the most endangered European seabird, whose time to extinction was estimated at only ~40 years a decade ago. 2. Since the previous assessment, new data and more sophisticated demographic modelling have become available, and new fishing policies from the European Union (Common Fisheries Policy, CFP) will apply, posing different scenarios for the viability of the species. Thus, there is both an urgent need and an opportunity for a more reliable update of the conservation status of the species. 3. Demographic data were collected between 1985 and 2014 at one of the world’s largest colonies. Most demographic parameters were estimated using multievent capture–recapture modelling. Some parameters, such as bycatch rate, immature individual surv