Ecological Segregation of Bustards (Otididae) in the North of the Lower Volga Region: Evolutionary and Adaptive Aspects

Based on the concept of an ecological niche, the processes of segregation in the Lower Volga populations of great and little bustards (Otis tarda L. and Tetrax tetrax L). have been studied in the evolutionary and adaptive aspects. The results have shown that segregation of the ecological niches of t...

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Bibliographic Details
Published in:Russian journal of ecology 2004-07, Vol.35 (4), p.247-253
Main Authors: Shlyakhtin, G V, Tabachishin, V G, Khrustov, A V, Zav'yalov, E V
Format: Article
Language:English
Subjects:
Biotopes
Birds
Breeding seasons
Food resources
Nesting
Niches
Otis tarda
Segregation
Tetrax tetrax
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Summary:Based on the concept of an ecological niche, the processes of segregation in the Lower Volga populations of great and little bustards (Otis tarda L. and Tetrax tetrax L). have been studied in the evolutionary and adaptive aspects. The results have shown that segregation of the ecological niches of the two species occurs mainly on a trophic basis, when bird specialization in the use of food resources provides the possibility of changing the nesting biotopes. Some trophic adaptations are temporary and do not modify a species-specific stereotype, whereas other adaptations lead to the development of new forms of behavior and their evolutionary stabilization. Spatial characteristics (biotopic preference, nest location, etc.) complement the identified hierarchical series of parameters characterizing the ecological niches of the species studied. In the Transvolga region of Saratov oblast, the total sizes of great and little bustard populations in the breeding season reach approximately 4100 and 5900 birds, respectively.[PUBLICATION ABSTRACT]
ISSN:1067-4136
1608-3334
DOI:10.1023/B:RUSE.0000033794.84672.de