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Interspecific territoriality between Common Nightigale (Luscinia megarhynchos) and Thrush Nightingale (Luscinia luscinia)
Jiran, Martin ; Reif, Jiří (advisor) ; Fuchs, Roman (referee)
7 Abstract Aggression between males of different species defending breeding territories against each other is called interspecific teritoriality and it is one of the most important factors affecting the species'coexistence in birds. Interspecific territoriality most often occurs when two previously separated closely related species come in to secondary contact (sympatry). Although this topic is frequently studied, only a few studies focused on this problem in species characterized by interspecific hybridization and copying of songs. In this thesis I focused on a system of two closely related passerines - Common Nightingale (Luscinia megarhynchos) and Thrush Nightingale (Luscinia luscinia). Both species had separated 1.8 million years ago, they have very similar morphology and ecological requirements and their ranges overlap in a narrow belt across central Europe. These species hybridize in this sympatric area, show ecological character displacement (more pronounced in Common Nightingale) and Thrush Nightingale often copies songs of Common Nightingale (Thrush Nightingale is thus called as "mixed singer"). Moreover, Thrush Nightingale has slightly larger body size than Common Nightingale. The last three patterns indicate existence of aggressive conflicts between the species, in which Thrush Nightingale may be...

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