Распространение и численность орлана-белохвоста в Вологодском Поозерье и юго-восточном Прионежье

• Main Authors: Кузнецов, А., Бабушкин, М.
• Format: Text
• Language: unknown
• Published: Общество с ограниченной ответственностью «Сибэкоцентр» 2008
• Subjects: ХИЩНЫЕ ПТИЦЫ; ПЕРНАТЫЕ ХИЩНИКИ; ОРЛАН-БЕЛОХВОСТ; Kostroma; Onega; Haliaeetus albicilla; White-tailed eagle; Орлан-белохвост
• Online Access: http://cyberleninka.ru/article/n/rasprostranenie-i-chislennost-orlana-belohvosta-v-vologodskom-poozerie-i-yugo-vostochnom-prionezhie; http://cyberleninka.ru/article_covers/14777311.png

Our research of the White-tailed Eagle (Haliaeetus albicilla) was carried out since 1988 to 2007 and covered large territory between the Volga river with Rybinsk, Yaroslavl and Kostroma cities, Onezhskoe Lake, Vodlozero Lake and the Onega river upper reaches in the north. As a result of our research we revealed the White-tailed Eagle congregating to breed with high density near banks of large lakes and water reservoirs. The largest concentration of breeding White-tailed Eagles was recorded near the Rybinskoe water reservoir in the Darwin State Nature Reserve and in its zone of protection, where near 35 pairs of eagles breed (Fig. 1, Table.1). The number of White-tailed Eagles has significantly increased for 60 years of the Nature Reserve functioning (Fig. 2). Several factors have determined the process. Monitoring 179 nests of the White-tailed Eagle in the Nature Reserve we found that breeding success of the species per breeding pair ranged from 0.54 to 0.82 chicks in different years, an average of 0.75 chick per pair for 20 years. Thus there are near 20 juveniles per 25 living nests in the Nature Reserve every year, and from 1.22 to 2.00 chicks per successful pair, an average of 1.51 chicks. Such sufficiently high breeding success confirms favorable conditions for the White-tailed Eagle population survive on the Rybinskoe water reservoir. The main peculiarity of that population is preference of eagles to breed closely on banks of large water bodies (lakes and water reservoirs) in a forest zone. A total of 100 pairs are estimated to breed in such habitats. Forming the largest breeding group about a third of the population inhabit the Darwin State Nature Reserve on the Rybinskoe water reservoir (30-35 pairs). It seems that from that group birds moved to breed on other large reservoirs of the region in 1980-90s. The second on number is the breeding group on the Vodlozero Lake (20-25pairs). Near 10-12 pairs are estimated to breed on the Sheksninskoe water reservoir, 10-13 pairs on the Vozhe Lake, 6-8 pairs in the western side of the Beloe Lake, 5-6 pairs on the Lacha Lake and 2-3 pairs the Kostroma part of the Gorkovskiy water reservoir. Also per 1-2 pairs were found on the Kovzhskoe Lake, on Lekshmozero Lake and several other lakes of the region (Table. 1). Our research of the White-tailed Eagle (Haliaeetus albicilla) was carried out since 1988 to 2007 and covered large territory between the Volga river with Rybinsk, Yaroslavl and Kostroma cities, Onezhskoe Lake, Vodlozero Lake and the Onega river upper reaches in the north. As a result of our research we revealed the White-tailed Eagle congregating to breed with high density near banks of large lakes and water reservoirs. The largest concentration of breeding White-tailed Eagles was recorded near the Rybinskoe water reservoir in the Darwin State Nature Reserve and in its zone of protection, where near 35 pairs of eagles breed (Fig. 1, Table.1). The number of White-tailed Eagles has significantly increased for 60 years of the Nature Reserve functioning (Fig. 2). Several factors have determined the process. Monitoring 179 nests of the White-tailed Eagle in the Nature Reserve we found that breeding success of the species per breeding pair ranged from 0.54 to 0.82 chicks in different years, an average of 0.75 chick per pair for 20 years. Thus there are near 20 juveniles per 25 living nests in the Nature Reserve every year, and from 1.22 to 2.00 chicks per successful pair, an average of 1.51 chicks. Such sufficiently high breeding success confirms favorable conditions for the White-tailed Eagle population survive on the Rybinskoe water reservoir. The main peculiarity of that population is preference of eagles to breed closely on banks of large water bodies (lakes and water reservoirs) in a forest zone. A total of 100 pairs are estimated to breed in such habitats. Forming the largest breeding group about a third of the population inhabit the Darwin State Nature Reserve on the Rybinskoe water reservoir (30-35 pairs). It seems that from that group birds moved to breed on other large reservoirs of the region in 1980-90s. The second on number is the breeding group on the Vodlozero Lake (20-25pairs). Near 10-12 pairs are estimated to breed on the Sheksninskoe water reservoir, 10-13 pairs on the Vozhe Lake, 6-8 pairs in the western side of the Beloe Lake, 5-6 pairs on the Lacha Lake and 2-3 pairs the Kostroma part of the Gorkovskiy water reservoir. Also per 1-2 pairs were found on the Kovzhskoe Lake, on Lekshmozero Lake and several other lakes of the region (Table. 1).