TERRITORIALISM AND CO-OPERATIVE BREEDING OF THE EASTERN YELLOW ROBIN Eopsaltria australis
| Posted: |
21/09/2021 |
| Author(s): |
S. Marchant |
I studied the Eastern Yellow Robin
Eopsaltria australis from 1975 to 1986 near Moruya.
N.S.W. The birds were distributed in territories of 1 to 2 hectares. A fire in 1980 did not at
once reduce breeding numbers; they declined next season. Established pairs held territories
while breeding. In the non-breeding season they lived in the same areas but were not seen
to defend territories. Some first year birds also bred. almost always without success; having
attempted to breed, these pairs then dispersed. Others attended the nests of their parents
or near neighbours. These attendants were first-year males. First-year females were unobtrusive
and were not known to act as attendants. Mildly threatening disputes within territories
early in the breeding season were probably directed towards evicting unwanted
immature birds by established pairs. Attendants were attached to only about one fifth of
the annual breeding attempts.
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