SEASONAL CHANGES IN RAPTOR NUMBERS AT ARMIDALE, NEW SOUTH WALES
| Posted: |
26/09/2021 |
| Author(s): |
Stephen Debus |
Transect counts and other observations in 1980 and 1984-1985 revealed a winter
low and summer peak in raptor numbers and species diversity at Armidale (N.S.W.).
Most of the common species were more numerous in summer than in winter; literature
data indicate that these species are correspondingly more numerous in winter than in
summer in some climatically less extreme areas in eastern and south-eastern Australia.
Some species at Armidale appear to conform to Newton's (1979) movement categories:
(a) breeding adults sedentary, surplus birds dispersive (Wedge-tailed Eagle
Aquila audax,
Little Eagle
Hieraaetus morphnoides, some Brown Falcons
Falco berigora and Australian
Kestrels
Falco cenchroides); (b) local movements (some Collared Sparrowhawks
Accipiter
cirrhocephalus, Peregrine Falcons
Falco peregrinus and Brown Falcons ; (c) migrants
(breeding: some Brown Goshawks
Accipiter fasciatus and Australian Kestrels; wintering:
Marsh Harrier
Circus aeruginosus); (d) nomadic or irruptive (Black-shouldered Kite
Elanus notatus, Black Kite
Milvus migrans).
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