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Intraspecific Differentiation of the Oriental Cuckoo (Cuculus optatus) within the Range: Relationship with the Abundance of Host Species
- Meshcheryagina, S. G., Golovatin, M. G., Bachurin, G. N.
- Russian journal of ecology 2019 v.50 no.1 pp. 27-33
- Cuculus, Phylloscopidae, breeding, eggs, host specificity, hosts, parasites, population density, races
- The distribution of C. optatus host-specific races within the breeding range has been analyzed. It has been found that these races are geographically separated: their distribution areas coincide with regions where the population density of corresponding race-forming host species (leaf warblers) is increased. The abundance of the brood parasite depends on the population density of race-forming host species and of accessory hosts (species laying pure white eggs). The group of accessory hosts plays an important role in areas where the proportion of race-forming species in the total population of leaf warblers is relatively small.