Posts tagged ibis
New publication: Population trends from 8 years of BRC Autumn Counts

We are proud to announce that counting millions of raptors, over thousands of hours and the help of hundreds of volunteers has now resulted in a new open access publication in Ibis.


Juvenile (left) and adult female (right) Honey Buzzard. Photo by Bart Hoekstra.


For 8 important species for the bottleneck, we have analysed trends over the past 8 years of standardised counts (2011-2018). Despite this short study period, we can already detect moderate changes in abundance for at least one age class in all species except Pallid Harrier. You can find the summary of our results through the button below, or read the paper in its entirety in Ibis.


Wouter M.G. Vansteelant, Jasper Wehrmann, Dries Engelen, Johannes Jansen, Brecht Verhelst, Rafa Benjumea, Simon Cavaillès, Triin Kaasiku, Bart Hoekstra & Folkert de Boer. (2019) Accounting for differential migration strategies between age groups to monitor raptor population dynamics in the eastern Black Sea flyway. Ibis.