Table 5, --Primary causes of death among pups, Reef Rookery 

 study area, St. Paul Island, 9 July to 22 August 1964 and 

 1966 



1/ Does not include 52 pups in 1964 and 7 in 1966 that were 

 unsuitable for examination. 



comparison could be made for the period Z8 

 June to 8 July because we did not examine the 

 pups that died during this interval in 1964. 



There is a lag between birth of the first 

 pups and maturation of hookworms, and no 

 pups were found dead from hookworm disease 

 in either year before 17 July. We can assume, 

 therefore, that hookworm disease caused no 

 deaths before examination began on 9 July and 

 that the incidence of deathfrom this cause from 

 28 June to 22 August was 8.1 percent in 1964 

 and 17.7 percent in 1966. 



Mortality from malnutrition and hookwornn 

 disease was about 10 percent higher and mor- 

 tality from trauma about 10 percent lower in 

 1966 than in 1964. The peaks of death from 

 malnutrition, hookworm disease, and infection 

 occurred at the same time in both years, but 

 the peaks from trauma did not (fig. 9). 



The number of dead pups collected, death 

 rates for Reef Rookery, and time of peak 

 mortality were similar for the 2 years (tables 2 

 and 6 and figs. 10 and 11). In 1965, the total 



TRAUMA 



20 r 



27 4 II 



JUNE JULY 



18 25 



I 8 15 22 



AUGUST 



MALNUTRITION 



27 4 II 



JUNE JULY 



I 8 15 22 



AUGUST 



20 

 V> 



a. 



3 15 ■ 

 Q. 



li. 



OlO 



(£ 



Ul 



CD 



5 5 



:d 



z 



HOOKWORM DISEASE 



1966 



27 4 II 



JUNE JULY 



15 22 



20 



w 



0. 



315 



0. 



INFECTION (BACTERIAL, VIRAL) 



27 4 II 



JUNE JULY 



18 25 



8 15 22 



AUGUST 



Figure 9. — Comparisons of the primary causes of death among pups. Reef Rookery study area, St. Paul Islands 



1964 and 1966. 



Table 6. --Comparison of number of dead pups on Reef Rookery study area 

 and St. Paul Island, 1964-66 



mortality for Reef Rookery was 155 percent 

 greater than in 1964. Causes of death were not 

 determined in 1965, so we do not know if the 

 increase was due to a proportional increase in 

 all causes or in one or a few causes. Ap- 

 parently the changes in mortality for the study 

 area were similar to those on the entire 

 rookery in 1964-66 (table 6). 



10 



