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Diet of nesting African Crowned Eagles Stephanoaetus coronatus in emerging and forest–savanna habitats in KwaZulu-Natal, South AfricaMalan, G, Strydom, E, Schulz, S, Avery, G 23 May 2016 (has links)
Abstract
The aim of this study was to investigate the species composition of prey caught in the forest, savanna and
emerging habitats in which African Crowned Eagles Stephanoaetus coronatus breed in KwaZulu-Natal province,
South Africa. At the 17 nest sites, the remains of 195 prey individuals were collected. The five dominant prey
species caught were Rock Hyrax Procavia capensis, Vervet Monkey Chlorocebus pygerythrus, Blue Duiker
Philantomba monticola, Greater Canerat Thryonomys swinderianus and Bushbuck Tragelaphus scriptus. All of
these species respond positively to urban expansion. Only eagles that nested inside protected areas were recorded
preying on domestic animals. In terms of biomass, Bushbuck was one of the dominant taxa, and the remains of an
estimated 28.8 kg Bushbuck ram was found under a nest. The surprisingly high proportion of Rock Hyraxes and low
proportion of Vervet Monkeys caught in emerging habitat may indicate that African Crowned Eagles nesting in this
habitat are adapting to a more specialised feeding strategy compared with those nesting in habitats that are more
natural. Future studies should investigate how and why prey proliferates in emerging habitats and examine the
association between land uses and the diet of African Crowned Eagles.
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Reproductive success and nesting periodicity of a pair of African Crowned Eagles breeding in KwaZulu-NatalMalan, G January 2005 (has links)
The African Crowned Eagle, Stephanoaetus coronatus, is a
large raptor with a particularly long breeding cycle, even
considering its size (Newton 1979). The incubation period is
49–51 days, the nestling period is 104–115 days and the
length of the post-fledging period is contentious and varies
considerably within its distribution in Africa (Steyn 1982). In
some regions where the bird breeds biennially, this period is
up to 350 days (Brown and Amadon 1989, Shultz 2002),
whereas in other regions the post-fledging period is shorter
as pairs bred annually, even for nine years in succession
(Vernon 1984). The reason for this discrepancy has been
ascribed to environmental quality and seasonal variability,
and differences in the main prey base, densities and mortalities
between populations (Newton 1979, Jarvis et al. 1980,
Steyn 1982, Vernon 1984, Boshoff et al. 1994, Shultz
2002). Furthermore, it is unclear if the fledglings disperse
from the nesting area of their own free will or are evicted by
the parents (Brown 1966, Oatley 1970).
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