. The Canadian field-naturalist. 1969 Weller, Trauger and Krapu: Birds of Great Slave Lake 12-1 10- 359 Q. (A o Ul 3 Z 5 -. DOTS 10 20 30 40 50 EST. ACRES OCC. 62 2 4 4 0 1 = 73 Figure 11. Area-diversitv pattern for birds observed and possibly nesting on the West iMirage Islands. open areas; , trees were a deterrent to ground-nesting birds on small islands but not on larger islands where relatively larger open spaces existed. Most breeding birds of these islands were ground-nesting species utilizing fish rather than foods associated with land. Undoubtedly, pop
. The Canadian field-naturalist. 1969 Weller, Trauger and Krapu: Birds of Great Slave Lake 12-1 10- 359 Q. (A o Ul 3 Z 5 -. DOTS 10 20 30 40 50 EST. ACRES OCC. 62 2 4 4 0 1 = 73 Figure 11. Area-diversitv pattern for birds observed and possibly nesting on the West iMirage Islands. open areas; , trees were a deterrent to ground-nesting birds on small islands but not on larger islands where relatively larger open spaces existed. Most breeding birds of these islands were ground-nesting species utilizing fish rather than foods associated with land. Undoubtedly, population size and species diversity both were increased markedly by this addition to the habitat. Acknowledgments We are indebted to iVIr. William McDonald, geologist and long-term resident of Yellowknife, who inspired an interest in the Great Slave Lake islands and who guided us to the offshore and West Mirage Islands. Both Trauger and Krapu were employed by the Northern Prairie Wildlife Research Center, Bureau of Sport Fisheries and Wildlife, and were engaged on studies of Lesser Scaup and other species on the mainland. Mr. Charles E. O'Brien of the American Museum of Natural History kindly identified some bird remains. Summary The breeding birds of 73 of 97 islands of this isolated group were studied on June 30 and July 3-5, 1968. Their location in a cold, deep lake produced a harsh environment and results in vegetation comparable to that 100 miles or. 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 Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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