POPULATION DENSITY AND HOME RANGE ESTIMATES FOR THE EASTERN BRISTLEBIRD AT JERVIS BAY, SOUTH-EASTERN AUSTRALIA
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|| Jack Baker
Twenty-two Eastern Bristlebirds Dasyornis brachypterus
were radio-tracked at Jervis Bay. Densities at two
sites were ≥1.5 and ≥2.1 birds/5 hectares respectively which were similar to previous aural surveys at Jervis
Bay and to the maximum density of 2.4 birds/5 hectares recorded at Barren Grounds. The average home range
minimum convex polygon area was approximately 10 hectares for the two birds tracked for more than 11 days.
Home ranges overlapped and there was no evidence of individuals or pairs occupying exclusive territories during
the non-breeding season. Management decisions which impact upon the Eastern Bristlebird will be flawed if they
assume the species is confined to small exclusive territories throughout the year. Even small-scale disturbances
in Eastern Bristlebird habitat are likely to impact upon numerous individuals.
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