. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 204 population might then be composed of pre- or non-breeders which visit the Atoll at irregular intervals and then only for short periods. Year to year fluctuations in density appear to be very small and random (POBSP, 1967a; Gould, King and Sanger, 1974). oo CC < cy in o o UJ Q- 8 i—i CO A M 0 N D Figure 66. Diurnal occurrence of Red-tailed Tropicbirds at sea 175 miles southwest of Johnston Atoll, Please note that these images are extracted from scanned page images t
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 204 population might then be composed of pre- or non-breeders which visit the Atoll at irregular intervals and then only for short periods. Year to year fluctuations in density appear to be very small and random (POBSP, 1967a; Gould, King and Sanger, 1974). oo CC < cy in o o UJ Q- 8 i—i CO A M 0 N D Figure 66. Diurnal occurrence of Red-tailed Tropicbirds at sea 175 miles southwest of Johnston Atoll, 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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