Our Liviiii; RcMiurccs 



Fish Populations in the Illinois River 239 



Contaminant Trends in Great Lakes Fish 242 



Lake Trout in the Great Lakes 244 



Wetlands in Regulated Great Lakes 247 



Decline in the Freshwater Gastropod Fauna in the Mobile Bay Basin 249 



Protozoa 252 



Marine and Freshwater Algae 255 



Freshwater Diatoms; Indicators of Ecosystem Change 256 



Coastal and Marine Ecosystems 



Overview 259 



Nearshore Fish Assemblage of the Tidal Hudson River 260 



Natural Resources in the Chesapeake Bay Watershed 263 



Florida Manatees 267 



Gulf of Mexico Coastal Wetlands: Case Studies of Loss Trends 269 



Seagrass Distribution in the Northern Gulf of Mexico 273 



Seagrass Meadows of the Laguna Madre of Texas 275 



Coastal Barrier Erosion: Loss of Valuable Coastal Ecosystems 277 



Reef Fishes of the Florida Keys 279 



Coral Reef Ecosystems 280 



Riparian Ecosystems 



Overview 285 



Western Riparian Ecosystems 286 



Surface Cover Changes in the Rio Grande Floodplain. 1935-89 290 



Ecoregions ^^_-.^^^— i^^-^— ^— — ^.^-.^— ^^^^-^— ^-^— — ^-^-^^^— ^— — ^^ 



The Great Plains 



Overview 295 



Declining Grassland Birds 296 



Migratory Bird Population Changes in North Dakota 298 



Duck Nest Success in the Prairie Potholes 300 



Conservation Reserve Program and Migratory Birds in the Northern Great Plains 302 



Decline of Native Prairie Fishes 303 



The Coyote: An Indicator Species of Environmental Change on the Great Plains 305 



Interior West 



Overview 309 



Ecosystem Trends in the Colorado Rockies 310 



The Greater Yellowstone Ecosystem 312 



Subalpine Forests of Western North America 314 



Southwestern Sky Island Ecosystems 318 



Endangered Cui-ui of Pyramid Lake, Nevada 323 



Bonytail and Razorback Sucker in the Colorado River Basin 324 



Amphibian and Reptile Diversity on the Colorado Plateau 326 



Wintering Bald Eagles Along the Colorado River Corridor 328 



Mexican Spotted Owls in Canyonlands of the Colorado Plateau 330 



Bighorn Sheep in the Rocky Mountain National Parks 332 



Desert Bighorn Sheep 333 



Alaska 



Overview 337 



The Arctic Tundra Ecosystem in Northeast Alaska 338 



Anadromous Fish of the Central Alaska Beaufort Sea 341 



Pacific Salmon in Alaska 343 



Wolves and Caribou in Denali National Park, Alaska 347 



Kodiak Brown Bears 349 



Polar Bears in Alaska 35 1 



Sea Otters in the North Pacific Ocean 353 



Pacific Walruses 356 



Mentasta Caribou Herd 357 



Tundra or Arctic Hares 359 



