498. 
499. 
OFF-ROAD VEHICLES, HARASSMENT, PREDA- 
TION, THREATENED AND ENDANGERED SPECIES, 
RECREATION MANAGEMENT, U.S. BLM LANDS, 
U.S. NATIONAL PARKS, U.S. NATIONAL WILD- 
LIFE REFUGES, WILDLIFE (GENERAL) 
U.S. Department of the Interior, Nation- 
al Park Service. 1981. Revised draft 
environmental impact statement: Griz- 
zly bear management program, Yellow- 
stone National Park, Idaho, Montana, 
Wyoming. U.S. National Park Service, 
Rocky Mountain Regional Office, Den- 
ver, Colo. 130 pp. 
This draft statement, preliminary to a 
final statement, reviews grizzly bear 
management alternatives and impacts in 
Yellowstone National Park. The con- 
tinuation of the present management 
program is proposed, aimed at main- 
taining a wild, free-ranging grizzly 
population and minimizing bear-human 
conflicts by reducing the availability 
of unnatural food sources and regulat- 
ing visitor distributions in the park. 
Impacts of the proposed plan on bears 
and park visitors are evaluated. 
CAMPING, HIKING, TOURISM, WILDLIFE VIEW- 
ING, FORESTS, HUMAN HEALTH AND SAFETY, 
THREATENED AND ENDANGERED SPECIES, REC- 
REATION MANAGEMENT, WILDLIFE MANAGEMENT , 
U.S. NATIONAL PARKS, U.S. NATIONAL FOR- 
ESTS, GRIZZLY BEAR 
U.S. Department of the Interior, Nation- 
al Park Service, Rocky Mountain Na- 
tional Park. 1980. Environmental as-~ 
sessment: Snowmobile route designa- 
tion in the West Unit, Rocky Mountain 
National Park. U.S. National Park 
Service, Rocky Mountain Regional 
Office, Estes Park, Colo. 41 pp. plus 
appendices. 
Policies and procedures concerning the 
designation of snowmobile routes in 
Rocky Mountain National Park are eval- 
uated. Harassment of wildlife is one 
of several impacts assessed for the 
proposed action and = alternatives. 
Snowmobile activities in the park and 
adjacent areas may affect elk and mule 
deer on winter ranges, and bald eagles 
wintering on Grand Lake. 
OFF-ROAD VEHICLES, HARASSMENT, FORESTS, 
LAKES, THREATENED AND ENDANGERED SPE- 
CIES, RECREATION MANAGEMENT, U.S. NA- 
TIONAL PARKS, WILDLIFE (GENERAL), ELK, 
MULE DEER, BALD EAGLE 
9] 
500. 
uOL, 
502. 
Protection 
noise on wildlife 
U.S. Environmental 
1971. Effects of 
and other = animals. U.S. Environ. 
Prot. Agency, Off. Noise Abate. Con- 
trol NTID300.5. 74 pp. 
Agency. 
Demonstrated and suspected effects of 
noise on wildlife and domestic animals 
are reviewed in this comprehensive re- 
port. Sources of noise potentially 
disturbing to wildlife include indus- 
tries, automobiles, aircraft, and rec- 
reational vehicles. 
URBAN ZONES, HARASSMENT, WILDLIFE (GEN- 
ERAL) 
U.S. Fish and Wildlife Service, Division 
of Wildlife Services. 1976. Survey 
of the southern bald eagle in Arizona. 
U.S. Fish Wildl. Serv. Endang. Spec. 
Rep. 1. 33 pp. 
During surveys of bald eagle nest 
sites and observations of breeding 
birds in Arizona, various disturbances 
to nesting birds were observed. Hik- 
ing and climbing near nests caused a 
high level of disturbance, and four 
nests were abandoned probably due to 
these factors. River floating did not 
appear to disturb nesting eagles 
greatly. Horseback riding appeared to 
have the least effect of any activity, 
perhaps due to eagle habituation to 
ranch and farm workers on horseback. 
HIKING, CLIMBING, BOATING, HORSEBACK 
RIDING, DESERTS, RANGELAND, RIVERS, 
FLIGHT DISTANCE, RECREATION MANAGEMENT, 
BALD EAGLE 
U.S. Senate, Committee on Interior and 
Insular Affairs, Subcommittee on Parks 
and Recreation. 1971. Hearing: 
Snowmobiles and other off-road vehi- 
cles. U.S. Government Printing Of- 
fice, Washington, D.C. 109 pp. 
This transcription of the 1971 Senate 
Hearing on off-road vehicles includes 
statements and related information 
submitted during the hearing concern- 
ing the use and impacts of off-road 
vehicles on public lands. Statements 
and appended articles describe direct 
and indirect effects of off-road vehi- 
cles on wildlife and habitat, manage- 
ment actions to minimize impacts, and 
future needs regarding legislation and 
enforcement. 
