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ŠUMARSKI LIST 11-12/2020 str. 26     <-- 26 -->        PDF

Although some bird species show a preference for the particular forest type (Diaz 2005, Kirin et al. 2011) this preference was not discovered in our study area. Species recorded in this study have wide ecological valence and can inhabit different types of forest habitats. In this study, we recorded both Short-toed Treecreeper and Eurasian Treecreeper, which rarely breed in sympatry. Short-toed Treecreeper is considered to be the dominant species, therefore constraining Eurasian Treecreeper towards higher altitudes (Gil 1997). Southwood (1961) concluded that oak trees have the highest number of insect species which could be very important for hole nesters, especially bark feeding species such as treecreepers. In riverine oak forests in Croatia, Eurasian Treecreeper is almost never recorded (Kralj 2000). However, in stands of lower quality with less feeding opportunities, such as the riverine forests in our research, it is evidently present along with its competitor or even alone (Sakhvon 2009). Furthermore, forest patches frequently occupied by Eurasian Treecreeper are characterized by a higher amount of