Saturday, November 21, 2009

Whooper Swan (Cygnus cygnus) at Altura

Another surprise - a Whooper Swan Cygnus cygnus has been found by Carlos Vilhena at the tank of Altura in the eastern Algarve yesterday. I went to see the bird in the afternoon. It was roosting next to the tank and I got the impression, that it was very exhausted. I could not see its legs, but others did and the bird is not ringed. It really looks like a wild bird to me ! Would be the second record for Portugal. I know that Whooper Swans sometimes join flocks of Common Cranes Grus grus on migration, of wich big numbers are wintering each year in the South of Portugal (inland) and Spain, like in Doñana, Andalusia. Lots of birds are already there. The yellow-brownish colour tone on the birds neck and head might come from pigments in the water it has been feeding in (Iron-Oxid or similar) but could also indicate that it is a second year bird. However, I miss the reference to clearify this at the moment. Bill colour defenitly excludes a 1st Winter bird. Its often young birds wich tend to "exaggerate" their passage and end up far beyond the actual wintering distribution of the species. In this case this would be the northern parts of central Europe, with the big lakes at the northern margin of the Alp mountains as the southern limit.
You can check a map of the wintering distribution of the species in Germany here, and in the UK here.
Its remarkable that 8 Whooper Swans (of how many in total ?)have been reported flying westwards on the north-western Tip of Galicia a week ago. And many northern Ducks and Geese has been reported. These Ind. could have reached the Algarve in the meanwhile. Here is the original note from
Whooper Swan Cygnus cygnus (1-8)
(1-8) A Coruña Eight birds were seen flying W from O Barqueiro, A Coruña on 13.11 (Ricardo Hevia)

Altura-reservoir actually is an rather ugly concrete-tank that does not look very attractive to waterbirds one should say, but it is filled with a Makro-Algae and therefore does attract many Common Coots (and Red-Crested Coot occasionaly) wich also feed on this plants, like Gadwalls and Swans...

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