viernes, 26 de septiembre de 2008

Nuevo Oceanodroma en Azores: preludio de nuevos cambios en Canarias? [New Oceanodroma petrel in Azores: prelude to Canarian splits?]

Como se avanzó en la revisión del libro Petrels hecha en este blog, se ha reconocido una de las especies propuestas dentro del grupo de cuatro en que quedaría dividido el Petrel de Madeira (Oceanodroma castro). En el último número de la revista Ibis se publica el artículo que describe el Petrel de Monteiro (nombre castellano pendiente y provisionalmente traducido así) Oceanodroma monteiroi, propio y endémico de Azores. Transcribimos el resumen del artículo en inglés por su interés. Los autores del libro de Petrels proponen una separación en Canarias: el Petrel de Grant. Tal vez el trabajo de Ibis esté abriendo camino para su reconocimiento y el del resto del grupo.

As stated in this blog review of the Petrels book, the proposed split of the Madeiran Storm-petrel in four taxa has already begun. The last issue of the journal Ibis, from the BOU, includes the description of the Monteiro's Storm-petrel, endemic to the Azores. We include due to its interest the full abstract of the paper. The Petrels book authors propose another split for the Canaries: Grant's Storm-Petrel. Perhaps the Ibis work is opening the path to the recognition of all four Oceanodroma taxa.

Monteiro's Storm-petrel Oceanodroma monteiroi: a new species from the Azores
MARK BOLTON 1,2*, ANDREA L. SMITH 3 , ELENA GÓMEZ-DÍAZ 4 , VICKI L. FRIESEN 3 , RENATA MEDEIROS 1 , JOËL BRIED 1 , JOSE L. ROSCALES 4 & ROBERT W. FURNESS 5
1 Department of Oceanography and Fisheries, University of the Azores, 9901-862 Horta, Portugal
2 Royal Society for the Protection of Birds, UK Headquarters, The Lodge, Sandy, Beds, SG19 2DL, UK
3 Department of Biology, Queen's University, Kingston, Ontario K7L 3N6, Canada
4 Departament de Biologia Animal, Universitat de Barcelona, Avenida Diagonal 645, 08028 Barcelona, Spain
5 Institute of Biomedical and Life Sciences, Graham Kerr Building, University of Glasgow, Glasgow G12 8QQ, UK
Copyright Journal compilation © 2008 British Ornithologists' Union
KEYWORDS
genetics • isotopes • moult • taxonomy • vocalizations

ABSTRACT

The existence of two seasonally distinct breeding populations of Oceanodroma storm-petrels in the Azores islands was first documented in 1996. The discovery of morphological differences between the populations led to the suggestion that they may represent cryptic sibling species. Recent mtDNA and microsatellite analysis from storm-petrel populations has considerably advanced our understanding of their taxonomic relationships. Here we present new information on the timing of breeding and moult of the two Azores populations, the extent of exchange of individuals between seasons, and diet from feather isotopes. We conclude that the hot-season Azores population should be considered a new species for which we propose the name Oceanodroma monteiroi, Monteiro's Storm-petrel. The species is both genetically distinct and genetically isolated from the sympatric cool-season population of Madeiran Storm-petrel Oceanodroma castro, and from all other populations of Oceanodroma castro in the Atlantic and Pacific Oceans examined to date. Differences in the vocalizations permit species recognition, and the extent of primary feather wear and stage of moult aids separation of the two species in the Azores, which is especially valuable during August when both attend the breeding colonies in large numbers. Feather carbon and nitrogen isotopes reveal that the diet of Monteiro's Storm-petrel differs from that of the sympatric Madeiran Storm-petrel during both breeding and non-breeding seasons, and unlike the Madeiran Storm-petrel, Monteiro's Storm-petrel appears to maintain the same foraging environment during the summer and winter months, though it shows a dietary shift to higher trophic levels during the non-breeding season. Monteiro's Storm-petrel is thought to be confined to the Azores archipelago, where it is currently known to nest on just two small neighbouring islets. The total population size was estimated at 250–300 pairs in 1999.


Received 7 November 2007; revision accepted 8 May 2008.

DIGITAL OBJECT IDENTIFIER (DOI)
10.1111/j.1474-919X.2008.00854.x About DOI

viernes, 12 de septiembre de 2008

Gaviota de Sabine 'en el interior'


Si observar una Gaviota de Sabine (Larus sabini) ya es un hecho noticiable, pese a no ser rareza estatal a causa de las citas que se producen con regularidad - pese a su escasez habitual - en el Cantábrico, sí lo es hacerlo 'tierra adentro'. Eso es exáctamente lo que nos relata José Antonio Sencianes en su correo electrónico de 12.9.2008 en el que nos dice:

'Te mando unas fotos de Gaviota de Sabine de ayer jueves 11 de septiembre en la dehesa de Abajo (Doñana) por si te interesan para la web. Yo no fui el primer observador, yo me llegué por un aviso de un colega para ver si la podía ver y fotografiar. Creo que la primera vez que se vio fue el miércoles 10 en compañía de 1 gaviota cana y varias enanas. Ayer también estaban conmigo 3 observadores mas: Ana Etxeberría, Fernando del Valle y otro mas que no recuerdo su nombre. Un saludo. Jose A. Sencianes'

El ave la encontraron Xurxo Pinheiro y Goyo Para el dia 10.9, y permanecía en la zona al menos el dia 12 (Paco Chiclana). Dehesa de Abajo está en Doñana, pero en el interior, alrededor de 30 km tierra adentro. Se trata, por tanto de una cita de interés remarcable. Fotos: J.A.Sencianes


Abstract: Inland Sabine's Gull record at Doñana. On 11 September 2008 and since 10th September to 12th September at least, a Sabine's Gull, see photos above (J.A.Sencianes) was recorded at Dehesa de Abajo, c.30 km inland, at Doñana marshes, Sevilla. It is an interesting record not only for the species but also for the place.