Natura Pitiusa

Durante la campaña oceanográfica Fauna III, organizada por el Museo Nacional de Ciencias Naturales de Madrid (CSIC) dentro del contexto del Proyecto Fauna Ibérica, se recolectaron diversas muestras cualitativas, tanto planctónicas como bentónicas, alrededor de las Islas Baleares y Columbretes. Con el presente trabajo se dan a conocer los resultados obtenidos del estudio de los Anfípodos (Gammaridea) de las muestras bentónicas de dicha campaña, correspondientes al entorno de la isla de Ibiza.  Ortiz, M. y A. Jimeno, A. (2003) Graellsia, 59(1): 97-99

Abstract Using combined miniature archival light and salt-water immersion loggers, we characterise the year-round individual at-sea movements of Europe's only critically endangered seabird, the Balearic shearwater  Puffinus mauretanicus , for the first time. Focusing on the non-breeding period, we show that all of the 26 breeding birds tracked from their breeding site on Mallorca in the Mediterranean Sea successfully made a 2–4 month migration into the Atlantic Ocean, where they utilised well-defined core areas off Portuguese and French coasts. As well as identifying high-risk areas in the Atlantic, our results confirm that breeding birds spend most of the year concentrated around productive waters of the Iberian shelf in the western Mediterranean. Migration phenology appeared largely unrelated to the subsequent (distinctly synchronous) breeding attempt, suggesting that any carry-over effects were compensated for during a long pre-laying period spent over winter in the Mediterr

ABSTRACT: The Balearic shearwater Puffinus mauretanicus is the rarest and most threatened Mediterranean seabird. The biology of this shearwater is poorly understood, and its study is important to design conservation strategies. We studied the feeding ecology of the Balearic shearwater at sea in the western Mediterranean (1996 to 2000), focusing on the importance of fisheries discards for this species. Fieldwork was conducted on board commercial bottom trawlers (demersal fishery with diurnal activity) and purse seiners (pelagic fishery with nocturnal activity), as well as during experimental trawling surveys. The shearwaters made extensive use of discards, mostly those from trawlers. This was especially so during the late breeding season, which could be related to the general impoverishment of Mediterranean surface waters. At this time of year, most birds foraged along the eastern Iberian coast, with the largest concentrations occurring off the Ebro Delta. This distribution seems determ