lunes, febrero 23, 2015

Winter census of Red Kite in Navarra (Northern Spain) 2015: 7 % decline after two years of recovery

60 volunteers and the Rangers of the Government of Navarra counted 1.678 red kites in 19 roosting places last January


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 17 winter seasons.
The results of the last wintering season are presented in this report. A full report and more detailed information can be found in The Red Kite in Navarra blog. The average of the population estimate for the Navarran population for the 17 census done is 1.957. The total count for the 2014/2015 wintering period was 1.678, down 9 % and 148 birds, from the previous 1.826 count. Furthermore, this value still represents 15 % less than the average census count and also represents a significant loss from the maximum value of 2.615 in 2007.
As a summary, in a few words, after two years with increasing values for the Navarran population this winter period observed a remarkable decrease in the number or wintering red kites. At the end of the day the values in this decade are far down from the averages values for the Navarran population in the 90’s, average value of 2.164 and the 00’s, average value of 2.059.
The Navarran wintering population of Red kite this year was distributed among 19 roosting areas, each one having a variable number of roosting places. Like in the previous two years the complete south of the region was not collecting many birds to the extent that even if we could see some scattered individuals during the day we were unable to locate any roosting places at all. This happens after the extinguishing of the roosting places of the Ribera and the prior disappearing of the roosting places in the Zona Media.
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.
This year 5 tagged red kites were spotted, 2 of them from a German origin and one from France. At the time of writing this report the origin of the remaining two is still to be found.
We do believe that national and international collaboration is a key factor in the conservation of the different species and in particular of the right kite. This year we are promoting the coordination of the census at a national level and will prepare a report when the data are collected.

Year
Population estimate
Count
1993
2290
2181
1994
2254
2147
2001
2249
2142
2002
2229
2026
2003
2008
1673
2004
2522
2522
2005
2244
2137
2006
2667
2615
2007
2240
2175
2008
1951
1894
2009
1959
1866
2010
1613
1536
2011
1810
1724
2012
1521
1449
2013
1755
1671
2014
1917
1826
2015
1.795
1.678



Average
2.060
1.957