High breeding success of the Collared Flycatcher in oak forests near Sumy in 2003. - N.P. Knysh. - Berkut. - 13 (1). 2004. - P. 134-136.
Weather conditions of very cold April and warm dry May did not adversely affect times of arrival and breeding of Collared Flycatchers inhabiting nesting boxes, but appreciably influenced on the breeding success. Full clutches (n = 53) had on average 6,17 ± 0,15 eggs. From 339 eggs (57 clutches) 301 (88,8 %) hatchlings have appeared, 274 (80,8 %) youngs left the nests. There were 5,28 ± 0,30 hatchlings and 4,81 ± 0,33 fledglings per nests. Death of offsprings was insignificant: 19,2 % in comparison with 36,1 % in 1999–2002. First of all it was caused by reduction of nest predation of Dryomys nitedula. Its population has suffered during long harsh winter. [Russian].
Key words: Collared Flycatcher, Ficedula albicollis, Sumy region, ecology, breeding, breeding success.
Adress: N.P. Knysh, Sumy Pedagogical University, Dep. of Zoology, Romenska str. 87, 40002, Sumy, Ukraine.