Berkut. 27 (2): 77-80. 2018.
University of Namibia, Department of Integrated Environmental Science; Ogongo Campus, Private Bag, 5520, Oshakati, Namibia
g.kopij@unam.na
Abstract. A territory mapping method has been employed in 2015 to assess the population density of all diurnal raptors and owls in a riparian forest on Zambezi River near Katima Mulilo, NE Namibia. The forest was c. 280 ha in surface area. The following densities (pairs/10 km2) were recorded: Haliaeetus vocifer – 7.1, Polyboroides typus, Milvus aegyptiacus, and Accipiter tachiro – each species with 3.6; Circaetus cinerascens, Kaupifalco monogrammicus each species with 1.8; Tyto alba – 14.3, Strix woodfordii – 10.7, and Glaucidium perlatum – 3.6. In general, the raptor population density in southern Africa is much higher in woodlands and savanna than in grasslands.
Key words: Accipitiformes, Strigiformes, census, habitat, population ecology.
Распространение и плотность гнездования дневных хищников и сов в одном из прибрежных лесов на р. Замбези в Северо-Восточной Намибии. - Г. Копий. - Беркут. 27 (2). 2018. - Исследования проводились в 2015 г. в лесу возле г. Катима-Мулило. Площадь его около 280 га. Плотность населения изучалась путем картирования. Получены следующие данные (пар/10 км2): Haliaeetus vocifer – 7,1, Polyboroides typus, Milvus aegyptiacus и Accipiter tachiro – по 3,6; Circaetus cinerascens и Kaupifalco monogrammicus – по 1,8; Tyto alba – 14,3, Strix woodfordii – 10,7, Glaucidium perlatum – 3,6. Плотность гнездования хищников на юге Африки намного выше в лесной местности и саванне, чем на лугах и пастбищах.
Ключевые слова: Accipitiformes, Strigiformes, учет, биотоп, популяционная экология.
Allan D., Jenkins K., Barnes K., Whittington P. (1996): Lesotho Highland Water Project. Final report, contract no. 1008. Baseline biological survey and reserve development; phase 1B, vol. 3: Fauna; Birds, p. 116-173. AfriDev. Consultans. Darling (South Africa).
Bibby C.J., Burgess N.D., Hill D.A., Mustoe S. (2002): Bird Census Techniques, 2nd ed. Academic Press, London.
Brown L.H., Urban E.K., Newman K.B. (1982): The Birds of Africa. Vol. 1. Academic Press, Cambridge (MA, USA).
Hockey P.A.R., Dean W.R.J., Ryan P.G., Maree S. (eds.) (2005): Roberts’ Birds of Southern Africa. John Voelcker Bird Book Fund, Cape Town.
Kopij G. (1996): Distribution and abundance of diurnal raptors in the Cold Highveld Grassland of South Africa. - J. of African Raptor Biology. 11 (1/2): 7-10.
Kopij G. (2001a): Birds of Roma Valley, Lesotho. Department of Biology, National University of Lesotho, Roma (Lesotho).
Kopij G. (2001b): Birds of the western part of the Dewetsdorp district, Free State. - Mirafra. 18 (2): 1-16.
Kopij G. (2016): Birds of Katima Mulilo town, Zambezi Region, Namibia. - Intern. Science & Technology J. of Namibia (Windhoek). 7: 85-102.
Kopij G. (2017): Structure of avian assemblages in Zambezian Baikiaea woodlands, northern Namibia. - Zoology & Ecology. 27 (1): 1-10.
Kopij G. (2018a): Ecological distribution and population densities of raptors in the inner and outer zone of a Central European city. - Ukr. J. of Ecology. 8 (1): 21-32.
Kopij G. (2018b): Atlas of birds of Kasane town, NE Botswana. - Babbler. 64: 3-15.
Kopij G. (2018c): Population density and community structure of birds breeding in Mopane Savanna of the Ogongo Game Park, north-central Namibia. - Intern. J. of Science & Technology of Namibia. 12: 117-134.
Kopij G., Paxton M. (2018): Seasonal changes in the diversity and numbers of waterbirds in a tropical river in Southern Africa. - Polish J. of Ecology. 66 (3): 257-269.
Mendelsohn J., Jarvis A., Roberts C., Robertson T. (2009): Atlas of Namibia. A Portrait of the Land and its People. Sunbird Publishers, Cape Town.
Petty S. J. (1998): Ecology and Conservation of Raptors in Forests. - Forestry Commission Archive. 118: 1-37.
Seymour C.L., Simmons R.E. (2008): Can severely fragmented patches of riparian vegetation still be important for arid-land bird diversity. - J. of Arid Environment. 72: 2275-2281.
Smith R.L. (1996): Ecology and Field Biology. 5th ed. Addison Wesley Longman, Menlo Park (CA).
Steyn P. (1982): Birds of prey of Southern Africa. David Phillip, Cape Town.
Sutherland W. J. (1996): Ecological Census Techniques: a handbook. Cambridge University Press, Cambridge (U.K.).
Tarbotton W.R., Vernon C.T., Allan D., Little M.R. (1993): Final Report: baseline biological survey: fauna and flora. Lesotho Highland Water Phase 1A. Contract no. 75. Vol. 7: Birds. Loxton Venn & Assoc., Johannesburg.