Wyoming Grasshopper Population Dynamics Maps

from Chapter II of Spatial Analysis of Ecological Factors Related to Grasshopper Population Dynamics in Wyoming

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1944-96 Grasshopper Outbreak Frequency Map | 1944-49 Grasshopper Outbreak Frequency Map | 1950-59 Grasshopper Outbreak Frequency Map | 1960-69 Grasshopper Outbreak Frequency Map | 1970-79 Grasshopper Outbreak Frequency Map | 1980-89 Grasshopper Outbreak Frequency Map | 1990-96 Grasshopper Outbreak Frequency Map | Spatial distribution map for the years when less than 300,000 ha were infested | Spatial distribution for map the years when more than 1,000,000 ha were infested | Region definition map | Infestation collapse 1966-67 map | Infestation collapse 1968-69 map | Infestation collapse 1975-76 map | Infestation collapse 1987-88 map | Infestation collapse 1988-89 map | Infestation expansion 1962-63 map | Infestation expansion 1971-72 map | Infestation expansion 1973-74 map | Infestation expansion 1978-79 map | Infestation expansion 1986-87 map



Fig. 1 (Updated from the 1960-93 map) Spatial distribution of rangeland grasshopper outbreaks in Wyoming from 1944 to 1996, with no data for 1982, 1983 or 1984 (Schell 1994). White = no recorded infestations; gray = 1-2 yr infested; blue = 3-4 yr infested; green = 5-6 yr infested; orange = 7-8 yr infested; red = 9-11 yr infested; yellow = 12-15 yr infested; light yellow = 16-21 yr infested; black = state and county borders.



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