. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. v â¢â¢â¢â¢ .â¢. ⢠â ⢠v \ .â¢â¢â¢â¢â¢ *⢠1 1â*â^ 1 1 M M A 0 N D Figure 69. Means and extremes of semimonthly estimates of Blue-faced Booby numbers, Sand Island, Johnston Atoll, 1963-1969. This many were sometimes present at night during POBSP studies, but there were never a dozen birds on the island during the day. Birds usually ar- rived within an hour before sunset and left by dawn. If present ratios of day populations to night populations were the same in 1957, then the 1957 population may have been sev
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. v â¢â¢â¢â¢ .â¢. ⢠â ⢠v \ .â¢â¢â¢â¢â¢ *⢠1 1â*â^ 1 1 M M A 0 N D Figure 69. Means and extremes of semimonthly estimates of Blue-faced Booby numbers, Sand Island, Johnston Atoll, 1963-1969. This many were sometimes present at night during POBSP studies, but there were never a dozen birds on the island during the day. Birds usually ar- rived within an hour before sunset and left by dawn. If present ratios of day populations to night populations were the same in 1957, then the 1957 population may have been several times larger than any recorded during the 1960's. POBSP observations indicate a continuing decline in numbers using the atoll (Table 42). Maximum numbers in 1966 were only about half the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Press; National Research Council (U. S. ). Pacific Science Board; Smithsonian Institution; National Museum of Natural History (U. S. ); United States. Bureau of Sport Fisheries and Wildlife. Washington, D. C. : [Smithsonian Press]
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