Status of the Balearic shearwater (Puffinus mauretanicus) on the Galician coast (NW Iberian Peninsula)

This paper aims to assess the status of the threatened Balearic shearwater Puffinus mauretanicus along the Galician coast (NW Iberian Peninsula) by studying its movements and numbers. Balearic shearwaters are detected off Galicia during their annual cycle although they are uncommon between November...

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Bibliographic Details
Published inScientia marina Vol. 67; pp. 135 - 142
Main Authors Mourino, J, Arcos, F, Salvadores, R, Sandoval, A, Vidal, C
Format Journal Article
LanguageEnglish
Published 01.07.2003
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Summary:This paper aims to assess the status of the threatened Balearic shearwater Puffinus mauretanicus along the Galician coast (NW Iberian Peninsula) by studying its movements and numbers. Balearic shearwaters are detected off Galicia during their annual cycle although they are uncommon between November and May. Overall, 44 groups of over 150 birds have been recorded in seven main areas since 1976, especially in the Vigo Ria and the Pontevedra Ria and along the coast of Bergantinos (Sisargas-Baldaio). Birds have been observed moulting primary and secondary feathers, mainly in June. North-eastward migration is evident along the Atlantic coast (capes Silleiro and Fisterra, daily maximum of 476 birds per hour) between June and August, where it seems to overlap with local movement. However, south-westward migration is far more frequent between September and October (daily maximum of 360 birds per hour) along the Cantabrian coast. The results might be biased due to the methodological problems, on account of the existence of irregular flows, an important inter-annual variability and local movements, probably brought about by the distribution of food resources.Original Abstract: Situacion de la pardela balear (Puffinus mauretanicus) en la costa de Galicia (nO peninsula iberica). - Este trabajo evalua el status de la amenazada pardela balear Puffinus mauretanicus en la costa de Galicia (NO Peninsula Iberica), estudiando sus movimientos y abundancia. Las pardelas baleares se pueden observar en el litoral gallego durante todo el ciclo anual aunque son escasas entre noviembre y mayo. En conjunto, 44 grupos de mas de 150 aves se han registrado en 7 areas principales desde 1976, especialmente en la Ria de Vigo, la Ria de Pontevedra y a lo largo de la costa de Bergantinos (Sisargas-Baldaio). Ha sido posible observar aves mudando primarias y secundarias, principalmente en junio. La migracion hacia el norte es patente en la costa atlantica (cabos Silleiro y Finisterre, maximo diario de 476 aves/hora) entre junio y agosto, donde parece solparse con movimientos locales. Sin embargo, la migracion hacia el sur es mucho mas frecuente a lo largo de la costa cantabrica entre septiembre y octubre (maximo diario de 360 aves/hora). Los resultados pueden estar algo sesgados debido a cuestiones metodologicas teniendo en cuenta la existencia de flujos irregulares, una importante variabilidad interanual y la existencia de movimientos locales, probablemente relacionados con la distribucion de recursos troficos. Palabras clave: pardela balear, Puffinus mauretanicus, costa de Galicia, areas importantes, movimientos, concentraciones.
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ISSN:0214-8358
DOI:10.3989/scimar.2003.67s2135