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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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.



Fig. 2. Regions of interest with respect to grasshopper outbreak distribution (blue = Northern Powder River Basin; light violet = Black Hills; orange = Platte-Goshen-Niobrara Complex; purple = Laramie Mountains; magenta = Southern Big Horn Mountains; green = Midwest and Thermopolis regions; yellow = Southern Powder River Basin; light blue = Laramie-Cheyenne Plains; black = state and county borders).



Additional Fig. Spatial distribution of rangeland grasshopper outbreaks in Wyoming from 1944 to 1949 (white = no recorded infestations; light shading = 1-2 yr infested; dark shading = 3-4 yr infested; purple = 5 yr infested; blue-green = 6-7 yr infested; red = 8-9 yr infested; black = state and county borders).



Additional Fig. Spatial distribution of rangeland grasshopper outbreaks in Wyoming from 1950 to 1959 (white = no recorded infestations; light shading = 1-2 yr infested; dark shading = 3-4 yr infested; purple = 5 yr infested; blue-green = 6-7 yr infested; red = 8-9 yr infested; black = state and county borders).



Fig. 3. Spatial distribution of rangeland grasshopper outbreaks in Wyoming from 1960 to 1969 (white = no recorded infestations; light shading = 1-2 yr infested; dark shading = 3-4 yr infested; purple = 5 yr infested; blue-green = 6-7 yr infested; red = 8-9 yr infested; black = state and county borders).



Fig. 4. Spatial distribution of rangeland grasshopper outbreaks in Wyoming from 1970 to 1979 (white = no recorded infestations; light shading = 1-2 yr infested; dark shading = 3-4 yr infested; purple = 5 yr infested; blue-green = 6-7 yr infested; red = 8-9 yr infested; black = state and county borders).



Additional Fig. Spatial distribution of rangeland grasshopper outbreaks in Wyoming from 1980 to 1989 (white = no recorded infestations; light shading = 1-2 yr infested; dark shading = 3-4 yr infested; purple = 5 yr infested; blue-green = 6-7 yr infested; red = 8-9 yr infested; black = state and county borders).



Additional Fig. Spatial distribution of rangeland grasshopper outbreaks in Wyoming from 1990 to 1996 (white = no recorded infestations; light shading = 1-2 yr infested; dark shading = 3-4 yr infested; purple = 5 yr infested; blue-green = 6-7 yr infested; red = 8-9 yr infested; black = state and county borders).



Fig. 6. Spatial distribution of rangeland grasshopper outbreaks for the years when less than 300,000 ha were infested (white = no recorded infestations; light shading = 1 yr infested; dark shading = 2 yr infested; dark blue = 3 yr infested; blue-green = 4 yr infested; red = 5 yr infested; orange = 6 yr infested; black = state and county borders).



Fig. 7. Spatial distribution of rangeland grasshopper outbreaks for the years when more than 1 million ha were infested (white = no recorded infestations; light shading = 1-2 yr infested; dark shading = 3-4 yr infested; dark blue = 5 yr infested; blue-green = 6-7 yr infested; red = 8-9 yr infested; black = state and county borders).



Fig. 8. Spatial distribution of rangeland grasshopper outbreaks during 1966-1967, when infestation area decreased by 59.7% from the previous year (dark shading = uninfested area; blue = area infested in 1966 only; yellow = area infested in 1967 only; green = area infested both years; black = state and county borders).



Fig. 9. Spatial distribution of rangeland grasshopper outbreaks during 1968-1969, when infestation area decreased by 92.6% from the previous year (dark shading = uninfested area; blue = area infested in 1968 only; yellow = area infested in 1969 only; green = area infested both years; black = state and county borders).



Fig. 10. Spatial distribution of rangeland grasshopper outbreaks during 1975-1976, when infestation area decreased by 52.0% from the previous year (dark shading = uninfested area; blue = area infested in 1975 only; yellow = area infested in 1976 only; green = area infested both years; black = state and county borders).



Fig. 11. Spatial distribution of rangeland grasshopper outbreaks during 1987-1988, when infestation area decreased by 95.8% from the previous year (dark shading = uninfested area; blue = area infested in 1987 only; yellow = area infested in 1988 only; green = area infested both years; black = state and county borders).



Fig. 12. Spatial distribution of rangeland grasshopper outbreaks during 1988-1989, when infestation area decreased by 89.5% from the previous year (dark shading = uninfested area; blue = area infested in 1988 only; yellow = area infested in 1989 only; green = area infested both years; black = state and county borders).



Fig. 13. Spatial distribution of rangeland grasshopper outbreaks during 1962-1963, when the infestation area increased by 346.1% over the previous year (dark shading = uninfested area; yellow = area infested in 1962 only; blue = area infested in 1963 only; green = area infested both years; black = state and county borders).



Fig. 14. Spatial distribution of rangeland grasshopper outbreaks during 1971-1972, when the infestation area increased by 228.4% over the previous year (dark shading = uninfested area; yellow = area infested in 1971 only; blue = area infested in 1972 only; green = area infested both years; black = state and county borders).



Fig. 15. Spatial distribution of rangeland grasshopper outbreaks during 1973-1974, when the infestation area increased by at least 340.6% over the previous year (dark shading = uninfested area; yellow = area infested in 1973 only; blue = area infested in 1974 only; green = area infested both years; black = state and county borders).



Fig. 16. Spatial distribution of rangeland grasshopper outbreaks during 1978-1979, when the infestation area increased by 331.3% over the previous year (dark shading = uninfested area; yellow = area infested in 1978 only; blue = area infested in 1979 only; green = area infested both years; black = state and county borders).



Fig. 17. Spatial distribution of rangeland grasshopper outbreaks during 1986-1987, when the infestation area increased by at least 243.6% over the previous year (dark shading = uninfested area; yellow = area infested in 1986 only; blue = area infested in 1987 only; green = area infested both years; black = state and county borders).



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