. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 167. 100 200 Figure 50. Distribution of Wedge-tailed Shearwater nest sites on Sand Island. Johnston Atoll, 1963-1969. Numbers indicate chicks banded in 1968. Populations The Wedge-tailed Shearwater population at Johnston Atoll consists predominantly of light phase individuals. Light phase populations also breed in the Hawaiian Islands and the northern Marshall Islands. Figure 53 shows means and extremes of semimonthly estimates made by POBSP personnel from 1964 through 1969 of Wedge-tailed Shearwater numbers o
. Atoll research bulletin. Coral reefs and islands; Marine biology; Marine sciences. 167. 100 200 Figure 50. Distribution of Wedge-tailed Shearwater nest sites on Sand Island. Johnston Atoll, 1963-1969. Numbers indicate chicks banded in 1968. Populations The Wedge-tailed Shearwater population at Johnston Atoll consists predominantly of light phase individuals. Light phase populations also breed in the Hawaiian Islands and the northern Marshall Islands. Figure 53 shows means and extremes of semimonthly estimates made by POBSP personnel from 1964 through 1969 of Wedge-tailed Shearwater numbers on Sand Island. These estimates were usually based on sample counts of birds above ground, plus a liberal allowance for birds in burrows and birds not returning to the island each night. Year to year variations in these estimates were small and more likely resulted from differences in estimating techniques than real variations in shearwater numbers. Hence, there is no evidence that the number of Wedge-tailed Shearwaters using the atoll varied during the years of POBSP studies. On 30 September 1966 Shelton made a sample count on all parts of Sand Island and found that 57 percent of 150 Wedge-tails had fresh orange streamers put on some time that year. About 1,720 birds had been streamered in 1966, most of them in August and September. Although there was no way to determine an exact figure, streamer losses were thought to be less than. 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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