FISHERY BULLETIN: VOL. 85, NO. 2 



Table 2. — Counts of adult and juvenile northern sea lions on individual rookeries for 

 selected surveys from spring and summer 1956 to 1985 in the Aleutian Islands and 

 Gulf of Alaska. 



'Rookery island name and code (within parentheses) as in Figure 1. 



^Mathisen and Lopp (1963). 



'Kenyon (text fn. 3), for central Aleutian Islands in 1962; Kenyon and Rice (1961), for eastern 

 Aleutian Islands in 1960 



■•Fiscus and Johnson (text fn. 9). 



sFiscus et al. (1981), for central Aleutian Islands in 1979: Braham et al. (1980), for eastern Aleu- 

 tian Islands in 1976; Calkins and Pitcher (text fn. 5), for western Gulf of Alasl<a in 1978 and central 

 Gulf of Alaska in 1979. 



^This study. 



'Significant difference from 1985 at P < 0.05. 



'nc = not counted. 



and 1984, and 76% at Akutan Island between 1965 

 and 1985 (NMMLii). 



Ugamak Island Surveys 



The estimated number of sea lions on Ugamak 

 Island was 14,536 in 1957 and 13,553 in 1968 (Table 

 2). Significant changes were not observed until 



"Data available from NMML files. Northwest and Alaska Fish. 

 Cent. Natl. Mar. Mammal Lab., NMFS, NOAA, 7600 Sand Point 

 Way N.E., Seattle, WA 98115. 



1975-78 (Braham et al. 1980), by which time 

 numbers had fallen to about 4,760 animals. Aerial 

 surveys in 1984 and 1985 found 1,252 and 1,429 

 animals, respectively. 



Ground counts of sea lions on Ugamak Island at 

 comparable sites and survey dates (Table 4) showed 

 a decline of 84% from 10,295 in 1969 to 1,684 in 

 1986. The decline was greatest between 1969 and 

 1977 when the count fell by 65%, from 10,295 to 

 3,577. Numbers fell 53% from 1977 to 1986, and 

 17% between 1985 and 1986. 



The number of breeding animals at Ugamak 



356 



