Eurasian eagle owl (Bubo bubo) colonizing lowland floodplain forests in south Moravia (Czech Republic) and cases of its breeding in wooden nestboxes
This paper presents data on the occurrence and breeding of Eurasian eagle owl (Bubo bubo) in south Moravia, Czech Republic (Břeclav and Znojmo districts), in the floodplains of the Morava and Dyje Rivers, since 1994, and the first cases of confirmed breeding from 2009 to 2011. In two cases, eagle owls bred successfully in large, wooden artificial nestboxes originally installed for saker falcon (Falco cherrug).
In 2015–2016, 6,429 km medium-voltage power lines with 76,430 pylons were checked for bird mortality in the Czech Republic. 1,326 bird victims of power lines were found, 156 of which died after collisions, and 1,170 birds were electrocuted. They belonged to 60 species from 12 orders, and birds of prey made up almost half of all victims. Steel pylons bearing several cross-arms including upper and crosswise jumpers were identified as most dangerous from the electrocution point of view. On the other hand, pylons in straight lines with Pařát cross-arms (triangular arrangement of conductors without any horizontal bar) were among the least dangerous, and when they had a simple perch fitted below the cross-arm, no mortality was recorded. But these pylons are new in practice and despite becoming widely used recently, they form less than one tenth of all pylons in the Czech Republic. On other pylons various types of mitigation measures have been installed. Commonly used plastic covers and plastic strips have proved to be especially effective, but only in cases when they are undamaged and correctly installed.