EKDERBURY ISLAND D. 
Brown Boobv (Sula leucogaste r j 
BIRDS 
- 
! ' ■ a _ a -a- ~~ -s 
W '-I > 
Current Status: Cornmon*resident nesting species* 
Prior Records: The only prior record is from, the Wilkes Expedition i Cassin 1858)* 
and the bird is merely recorded as present* 
Population: The largest number estimate on any trip was 300 in November, 19&L 19 I 3 
and the lowest number was 100 in July and November, 1961. The population does 
some 
-net- show a**v- correlation with the number of nests 
*~r 
4fey February 
Over 150 adults have been banded and in 'July, 1965 only— 
60 
was-efeserved-te-be-banded-r- approximately 50$ of the A birds-wes?© observed 4© 
were 
he-banded* ) This would indicate that 
the population is only slightly larger than the 300 estimated in November, 1963 
and that a proximately 50 % of the population is aiway present in any one day* 
The largest breeding population was 86 in November, 1963 and the smallest 
25 in Feb*, 1964* The nesting population usually comprises about 50$ of the 
total population on the i sland although it was 28% in Nov*, 1963 and 13$ 
in Feb., 1964. 
■■—'Wc'pjpS- 
' _ 'o'-i“fa > c / ed' Booby' w'. 
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Jr 
R 0 d-fbo 
(=> s 
\f V V/ . 
>Hbdby phfich grfiow a .drbffnite ann 
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ihbe^ii'p p^duLation. These patterns are coni' 
cle^ritd 4 __,Mlch largerwhdhy 
/ 
.ed 
✓ 
tc 
a. n 
Annual Cycle: The presence of^a nnual cycle is not certain nor _l.s there any 
evidence Jjdt a definite cycle of any length 
5 show* 
%e pofaKS 
jreedin 
uapl ?. 
(e tfigupe - 
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activity in^ti 
wo ye 
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