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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Environment and avian song: case of South African birds
 Mikula, Peter ; Albrecht, Tomáš (advisor) ; Linhart, Pavel (referee)
Relationship between animal signalization and environmental conditions, where these species are living, is one of crucial topics of ecology. Using two complementary statistical approaches (fourth-corner and RLQ analyzes) I investigated geographical variation in parameters of bird vocalization in South Africa (RSA) and Lesotho. Altogether, I used nine quantitative and five qualitative acoustic traits for 472 bird species and nine environmental variables which could significantly influence parameters of their vocalization. My results supported findings of previous studies about the important effect of body size on species-specific vocal characteristics. In passerines, analyzes corrected for body size showed that the number of elements and element types were increasing with variability of natural conditions and were highest in very arid and climatically unpredictable areas. Element and element type rate were positively associated with altitude. Minimal song frequency in passerines and frequency range of vocalization in other birds were negatively correlated with average temperature of warmest and coldest month of the year, respectively. Similarly, environmental variables significantly influenced distribution of several qualitative song traits in passerines. Passerines, where female song and...
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Phylogeography in Nearctic birds
 MIKULÁŠ, Ivan
Birds are a group of the highly mobile animals in which phylogeographic differentiation might be comparatively minor. Geographic patterns of genetic variation were reviewed and compared in codistributed North American bird species. The second part of the thesis is focused on taxonomic rank of Nearctic bird subspecies.
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