New paper reveals how landscape factors affect territory occupancy and breeding success of Egyptian Vultures on the Balkans

27.11.2016

Vultures are amongst the most threatened group of birds on the Planet. They are affected by a large number of threats such as poisoning, electrocution, collision with man-made structures, direct persecution, changes in agricultural practices, landscape composition, and sanitary regulations that can reduce food availability. To formulate effective conservation strategies, it is of key importance to quantify which of these factors has the greatest influence on demographic parameters such as territory occupancy and breeding success, and whether quantitative models can be transferred across geographic regions and political boundaries. New scientific paper of the LIFE+ project “The Return of the Neophron” collated territory and nest monitoring data of the endangered Egyptian Vulture Neophron percnopterus in the Balkans to understand the relative influence of various factors on population declines. Data on occupancy in 87 different territories and breeding performance of 405 territory-monitoring years between 2003 – 2015, with an overall territory occupancy rate of 69% and a mean productivity of 0.80 fledglings per occupied territory, were used for the aim of analysis. The paper examined which of 48 different environmental variables were most influential in explaining variation in territory occupancy and breeding success in Bulgaria and Greece, and tested whether these models were transferrable to the Former Yugoslav Republic of Macedonia. Territory occupancy and breeding success were affected by a wide range of environmental variables, each of which had a small effect that may not be the same across political boundaries. Both models had reasonably good discriminative ability, but were unsuccessful in predicting occupancy or breeding success in the external validation data set from a different country. Management dealing on a small number of environmental variables is unlikely to be effective in slowing the decline of Egyptian Vultures on the Balkan Peninsula. Recommend measures in the short term should be focused on the reduction of adult mortality through the enforcement of anti-poison laws, and in the long term – to the adoption of large-scale landscape conservation programs that retain or restore historical small-scale farming practices may benefit vultures and other biodiversity.

The full paper is available here.

 

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