State of the White Stork (Ciconia ciconia) population in Ukraine in 2012. - V.N. Grishchenko, E.D. Yablonovska-Grishchenko. - Berkut. 21 (1-2). 2012. - P. 50-63.
The year 2012 was 21st one of monitoring studies of the White Stork in Ukraine. Data analysed were obtained on 132 monitoring plots in all the regions of Ukraine. They had 1652 occupied nests on the overall area 9.6 ths km2. Migration and breeding phenology, number dynamics and breeding success were studied. The year was medium for the White Stork population in Ukraine by majority of parameters. Timing of the spring arrival was close to average dates. In separate regions deviations of mean first arrival dates from long-term mean dates (1992–2012) fluctuated from –3.2 to +4.0 (0.03 ± 0.55 days (± se), 14 regions). Young birds left the nests since 5.07, majority of broods started to fly on 15–25.07. Mean date of the fledge was 21.07 (± 0.3 days, n = 58). The autumn passage went also in usual terms. The first migrating flocks were observed on average on 16.08 (± 1.6 days, n = 20, lim: 30.07–28.08). Last departures were registered since 20.08 till 8.10 (average – 1.09, n = 30). In 2012, the White Stork population in Ukraine has slightly increased. On monitoring plots, the number rose on average in 3.4 ± 1.3% (n = 108). The largest number increasing was registered in Central Ukraine (10.0 ± 3.4%, n = 15). Reproductive parameters were close to long-term means. Storks raised on average 2.50 ± 0.05 fledged youngs per breeding pair (JZa) and 2.78 ± 0.04 fledged youngs per successful pair (JZm). 10.2 ± 0.9 pairs bred unsuccessful. Productivity of breeding rose from the west to the east. It was expressed to the greatest extent in northern part of Ukraine. The peculiar gradient was traced across the forest zone from Volynia to Chernigiv region. Reproductive parameters were the lowest in West Ukraine to the North from the Carpathians (JZa = 2.08 ± 0.05; JZm = 2.35 ± 0.05; n = 40) and the highest in North-East Ukraine (JZa = 3.04 ± 0.13; JZm = 3.25 ± 0.11; n = 17). Broods had from 1 to 6 fledglings. Majority of stork pairs in Ukraine raised 3 youngs (40.1%, n = 1445). Frequency graphs varied for different regions. In West Ukraine 47.6% of stork pairs raised only two youngs. The largest number of big broods was found in South-East Ukraine: 47.8% of them had 4 fledglings. Only one nest with 6 young storks was registered in Chernigiv region. The proportion of broods with 5 fledglings varied from full absence in Central Ukraine and the plain part of West Ukraine to 10.9% in north-eastern part of the country. [Russian].
Key words: monitoring, breeding success, number dynamics, migration, phenology.
Address: V.N. Grishchenko, Kaniv Nature Reserve; Kaniv, 19000, Ukraine; e-mail: vgrishchenko@mail.ru.