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The dependence of the breeding success of the eagle owl on the population dynamics of rodents, which are a staple of its diet in Mordovia, was traced. At peak numbers of rodents, large clutches and a high survival rate of fledglings were observed in the breeding pairs; after a year of depression of rodent populations, in the following year, the pairs do not nest at all or their breeding success is reduced to a minimum due to the death of the clutches. In 52% of the cases, the nesting pairs laid three eggs; in 31%, two eggs; in 9%, four eggs; in 4%, one egg or five eggs. The average clutch size was 2.78 ± 0.17. The average number of chicks grown from a successful nest was 2.41 ± 0.27. The nests in Mordovia were located at a distance of 1.1–3.7 km from residential areas.

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Andreychev, A.V.; Lapshin, A.S.; Kuznetsov, V.A., 2016: Breeding success of the Eurasian Eagle Owl (Bubo bubo) and rodent population dynamics. Biology Bulletin 43(8): 851-861.

Alexey Andreychev

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This page is a summary of: Breeding success of the Eurasian eagle owl (Bubo bubo) and rodent population dynamics, Biology Bulletin, December 2016, Pleiades Publishing Ltd,
DOI: 10.1134/s1062359016080045.
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