Comparative Breeding Bata - Laysan and Lisianski 
Date of Population and Breeding 
Survey Bat a - -BlKiamfci Laysan 
Population and Breeding 
Bata -- Lisianski 
late 
Mar. 
1968 
100 - 150 , Little nesting 
Only 8 a nests seen, 1 
•with/e 
250 - Only e present. 
SNCNrll: 31 % e, 69/0 
empty, ca. 150-200 
nesting birds present 
Relationship of Lisi- 
anski cycle to Laysan 
Cycle clearly somewhat 
earlier to initiation 
on Lisianski 
1968 summary -- Cycle initialied somewhat earlier on Lisianski 
lat e 
Mar. 
1969 
kkO* SLOT: 60 : 67/0 / 
e and 33 % empty, act. 
y 2 i 4 - Ct. of 107 n around Cycle initiated apparently 
shoreline. \ SNCN: 8 : 25 % somewhat earlier on Laysan 
with e, 75% emp but act. 
Overall conclusion vis a vis Laysan: 
Similar, but initiation of laying may be slightly 
earlier in some years (196^, 1967, 1968), later 
in others (1965^ 1966, 1969). 
