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Nest Predation on Red-backed Shrike (Lanius colurio) in the Trigrad - Yagodina Karst Region

Posted 21/8/2015

Nest Predation on Red-backed Shrikes (Lanius collurio) in the Trigrad - Yagodina Karst Region

Global extinction of species increased the need for nature conservation. One of the species that is prone to this extinction is the Red-backed Shrike (Lanius collurio), which showed a significant population decline in western and northern Europe. The disappearance of traditional pastoral activities from these areas appears to be the main cause of this decline. However, the factors behind this remain unclear. These agricultural changes not only make the area less suitable for Red-backed Shrikes, but also increase the suitability for Corvids, which are the main nest predators of Red-backed Shrikes. As nest predation is the most limiting factor to reproductive success, it might play an important role in the decrease of Red-baked Shrike in several countries. In order to place nest predation in these areas in perspective, it is necessary to have an impression of the role of nest predation in a stable population first. In this study Red-backed Shrikes and their potential predators are surveyed in the Western Rodopi Mountains (Bulgaria), along with behavioural observations aimed at capturing prey-predator interaction.