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. 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).



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