i 
- 2 - 
Lisianski islands. From these figures, one can calculate the ratio of adults 
to pups, immatures to pups, and adults+immatures to pups as presented in Table II. 
Since approximately 50% of the pups past newborn stage had apparently been 
weaned, and the mothers returned to sea to feed, an ammendad total adult pop¬ 
ulation was calculated to obtain a better view or the adult to pup ratio. mis 
number was calculated by adding to the figure for total adult population the 
number obtained by multiplying by «o the total pup or the year figure (not 
counting newborn.) For purposes of comparing these figures to those ror 
elephant seal Kirounga angustirostris counts made on certain Mexican islands, 
I have used the counted adult to pup ratio, because in fact, not all the adult 
animals are present on elephant seal breeding grounds either ( most of the adult 
_ 1 
females are present, but bachelor bulls are excluded.) 
TABLE I. MONK SEAL POPULATION CENSUS 
Category 
Laysan 
Lisianski 
Combined 
Adults, 
counted 
95 
n 
male 
27 
37 
w 
9 
female 
33 
30 
9 
undetermined 
58 
23 
Inara tur 
es v counted 
51 
26 
ii 
v male 
12 
10 
to 
P ferule 
15 
6 
el 
y undetermined 
24 
10 
?u? of 
Year* counted 
54 
33 
V? 
* rale 
38 
14 
(9 
<j icings 
11 
17 
It 
v undetermined 
5 
2 
218 
64 
68 
86 
77 
22 
21 
34 
87 
52 
28 
7 
reborn. 
counted 
14 
3 
ii 
> 
male 
ii 
* 
female 
WW 
2 
ii 
> 
undetermined 
14 
1 
»tai 
242 
242 
157 
157 
17 
Adults, calculated 149 
Adults, paired male/female 
112 
x 
16 
2 
1 
399 399 
261 
16 
m 
