- Furthermore, data from study plots on Midway indicate that, 
under normal conditions of nest mortality, 33 percent of the nesting 
birds fail -to nest the following season. If we allow 5 percent for 
mortality, this means that the total population of sexually mature 
birds is about 42 percent greater than the number actually nesting 
during any one season. Therefore; the total effective nesting popu- 
lations are about 800,000 Laysan albatrosses and 160,000 black-footed 
albatrosses. ; 
Table 1. --Summary of Breeding Populations of Albatrosses 
in the Hawaiian Archipelago, 1957-58. 
os Number _ of breeding birds 

Island or atoll : Layean albatrosses : Black-footed albatrosses 
Kure Atoll 700 140 
Midway Atoll 200,000 17,000 
Pearl and Hermes Reef 36,000 14,000 
Lisianski Island 60,000 5,500 
Laysan Island . 260,000 67,000 
Gardner Pinnacles ; 6 = 
French Frigate Shoals 1,200 3,000 
Necker Island 5,000 750 
Nihoa 1,000 100 
Kaula | -- | 200 
Niihau 1,000 ae 
Moku Manu o* == 
a eee Se ek rr ee a ea Ee ee 
TOTAL ca. 560,000 ca.110,000 
a a a e 
* One pair nested in 1946-47 and 1947-48; one bird observed in December 
' 1955, and three in December 1956. (Hawaii Audubon Society records.) 
