. The bison of Yellowstone National Park. American bison; Mammals. 66 Bison of Yellowstone National Park. /9JS /940 /94S /950 /955 /960 /965 /970 Cumulative Populahcw a/umbexs & so* % zo° pi re i'l I!. /9JS /940 /945 /9SO /9SS /960 /965 /970 fcwcr/cws Fig. 24. Bison population trends from population counts, 1936-68. The 1955 reduction in the Mary Mountain area may have started the downward trend shown be- tween the counts of 1954 and 1956. The marked decrease in population numbers in the Mary Mountain and Pelican herds, and the smaller decrease in Lamar cannot be entirely due to the re- du
. The bison of Yellowstone National Park. American bison; Mammals. 66 Bison of Yellowstone National Park. /9JS /940 /94S /950 /955 /960 /965 /970 Cumulative Populahcw a/umbexs & so* % zo° pi re i'l I!. /9JS /940 /945 /9SO /9SS /960 /965 /970 fcwcr/cws Fig. 24. Bison population trends from population counts, 1936-68. The 1955 reduction in the Mary Mountain area may have started the downward trend shown be- tween the counts of 1954 and 1956. The marked decrease in population numbers in the Mary Mountain and Pelican herds, and the smaller decrease in Lamar cannot be entirely due to the re- ductions of 1956; there was none in Pelican. The decrease coincided with the severe winter of 1955-56, when snows were exceptionally heavy in January, and severe cold was prolonged in February. A large winter loss that year was indi- cated by sightings of 20-30 dead animals in Pelican during an aerial census of late January 1956 (Jim Stradley 1968 pers. comm.). The following June, 32 dead animals were counted in the main valley (Larry Brown 1969 pers. comm.). Reduction only added impetus, apparently, to a natural occur- 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 Meagher, Margaret Mary; United States. National Park Service. [Washington] : U. S. Dept. of the Interior, National Park Service
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Keywords: ., bookauthorunitedstatesnatio, bookcentury1900, booksubjectmammals
