Regional Trends of Biological Resources — Grasslands
Figures
Figure 1 --- Potential vegetation types
in the central grasslands.
Figure 2 --- Extent of historical prairie
grasses of the Great Plains.
Figure 3 --- Tall-grass prairie.
Figure 4 --- Mixed-grass prairie
in Nebraska Sandhills.
Figure 5 --- Short-grass prairie
in Laramie Plain, Wyoming.
Figure 6 --- Importance of coevolution
between grazing and native prairie bird distributions and abundances.
Figure 7 --- Prairie wetlands, showing
the zonation of wetland plant communities.
Figure 8 --- The prairie pothole region
of the northern Great Plains.
Figure 9 --- Upper California Crossing,
Oregon Trail, Fort Sedgewick (Ovid), Colorado 1900(a) and 1990(b).
Figure 10 -- Fire plays a major role
in prairie dynamics.
Figure 11 -- The Dakota skipper,
a rare prairie butterfly.
Figure 12 -- The prairie mole cricket
an unusual and rare prairie species.
Figure 13 -- A mountain plover, an
endemic bird species of the short-grass prairie.
Figure 14 -- Distribution and trends
of selected grassland bird species in the U.S. and Canada.
Figure 15 -- A bison herd in southwestern
South Dakota.
Figure 16 -- Priority landscapes of
biological significance in the Great Plains.
Figure 17 -- Confluence of the
turbid waters of the Yellowstone and the clear waters of the Missouri.
Figure 18 -- Black Hills: Cathedral
Spires, South Dakota.
Figure 19 -- Arikaree River, Colorado.
Figure 20 -- Rainwater Basin, Nebraska.
Figure 21 -- Upper Cimmaron Mesas:
Lasa, Mesa de Maya, Colorado, Cobert Mesa.
Figure 22 -- Texas Hill Country;
San Marcos River, Texas.
Figure 23 -- Platte River with
sandhill cranes.
Tall-grass Prairie Butterflies and Birds:
- Figure 1 -- Percent decline of three grassland sparrows between 1966 and 1993.
- Figure 2 -- Regal fritillary on a purple coneflower.
- Figure 3 -- Powershiek skipperling.
- Figure 4 -- Percent correlation in abundance between species pairs.
Duck Plague: Emergence of a New Cause of Waterfowl Mortality:
- Figure 1 -- Geographic distribution, spread, and relative activity of duck plague in the U.S. since 1967.
- Figure 2 -- Number of duck plague outbreaks in the United States by decade since 1970.
- Figure 3 -- Death of 40,000 mallards at Lake Andes National Wildlife Refuge during the 1973 outbreak.
Population Trends for Prairie Pothole Carnivores:
- Figure 1 -- Coyote hunting in prairie grassland.
- Figure 2 -- Red fox in prairie grassland.
- Figure 3 -- Number of red foxes and coyotes seen per hour during winter deer censuses.
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