Winter roosting places of Red Kite in Navarra 2012: evolution demography, characterization and use. English summary.
Navarra is a region of around 10.000 km2 located in the northern part of Spain, along the Spanish/French border, and to the south of the Pyrenees. The navarran population of Red Kites was first thoroughly monitored twice in the 90’s during the 92/93 and 93/94 wintering seasons and then continuously counted in the 2000’s for the last 12 winter seasons.
The results of the last wintering season are presented in this report. The average of the population estimate for the Navarran population for the 14 census done is 2.111. The total count for the 2011/2012 wintering period was 1.449, down from the 1.724 previous record representing 16 % less birds. This value also represents 28 % less than the average census count. It also only represents 57 % of the maximum value obtained in 05/06 with 2.667 individuals.
As a summary, in a few words, the Navarran wintering population of Red kite shows a worrying decreasing tendency since maximum 2005/2006
The Navarran wintering population of Red kite this year was distributed among 18 roosting areas, each one having a variable number of roosting places. The complete south of the region was not collecting nearly any birds after the extinguishing of the roosting places of the Ribera and the prior disappearing of the Zona Media. This is a fact that happens for the first time since the beginning of this monitoring program.
Up to date 14 Red kites have been tagged in Navarra by Jesús Mari Lekuona team and these birds have been found in Spain (Burgos, Huesca, León) and France, as well as locally. One bird was found dead in León and the source reasons for the dying are being investigated. We continued our co-operation with European Research Teams spotting foreign visitor birds from France and Germany and also helping a German group to shot a video on the wintering habits of the species.
This population seems to be very dependent on the public dumping areas and this is the potential reason for the significant changes observed in the distribution of the kites inside the region in the last few winters when several dumping areas were closed and dumping activities concentrated in a few places.
Year
|
Count
|
Population estimate
|
1993
|
2.181
|
2.290
|
1994
|
2.147
|
2.254
|
2001
|
2.142
|
2.249
|
2002
|
2.026
|
2.229
|
2003
|
1.673
|
2.008
|
2004
|
2.522
|
2.522
|
2005
|
2.137
|
2.244
|
2006
|
2.615
|
2.667
|
2007
|
2.175
|
2.240
|
2008
|
1.894
|
1.951
|
2009
|
1.866
|
1.959
|
2010
|
1.536
|
1.613
|
2011
|
1.724
|
1.810
|
2012
|
1.449
|
1.521
|
Average
|
2.006
|
2.111
|
Support and collaboration
This
census and report was sponsored by the Government of Navarre under the NECROPIR
project Project nr. EFA 130/09. Habitat and Wildlife Guards Departments
supported this census. Volunteers from the Sociedad de Ciencias Naturales
Gorosti also contributed.
Details of the
this census and the complete monitoring program can be found in
The blog of the species in
the region http://milano-real.blogspot.com.es/
And Gorosti’s webpage http://sites.google.com/site/scngorosti/Home/secciones/seccion-de-zoologia/ornitologia/proyecto-milano-real
No hay comentarios:
Publicar un comentario