. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 164 At-Sea Distribution Bulwer's Petrels were found in the grid in all months except December, January, February, and June (Table 21 and Fig. 49). Since the grid population is too high to be accounted for by Johnston birds, and the peaks occur just before and after the breeding season, it is unlikely that Johnston based birds make more than a minor contribution to the grid population. The September peak in grid birds is certainly concurrent with the major southward migration from the Hawaiian chain (POBSP, 196
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 164 At-Sea Distribution Bulwer's Petrels were found in the grid in all months except December, January, February, and June (Table 21 and Fig. 49). Since the grid population is too high to be accounted for by Johnston birds, and the peaks occur just before and after the breeding season, it is unlikely that Johnston based birds make more than a minor contribution to the grid population. The September peak in grid birds is certainly concurrent with the major southward migration from the Hawaiian chain (POBSP, 1967a). J F MA MJ JASON Figure 49. Diurnal occurrence of Bulwer's Petrels 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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