Filters: Tags: Northwestern Naturalist (X)
2 results (5ms)|
Filters
Date Range
Extensions Types Contacts Categories |
We conducted surveys in Rocky Mountain National Park, Colorado for amphibians in 1987-1994. Four species, Ambystoma tigrinum, Bufo boreas, Pseudacris maculata,and Rana sylvatica, were recorded. Pseudacris maculatawas the most widely distributed and abundant species in the Park. Two populations of Emaculata were estimated to contain 161 and 136 breeding males in 1988. There was no evidence of a decline of A. tigrinum or R. sylvatica, but these species were found at relatively few locations. We did not detect Rana pipiens, which had been known previously from 3 locations in the Park.We found 7 breeding populations of B. boreas, which has declined recently elsewhere in the southern Rocky Mountains,but all but 2 of...
The pygmy rabbit (Brachylagus idahoensis) is the smallest leporid in North America and is endemic to sagebrush-steppe habitats of the Great Basin (Jansen 1946; Green and Flinders 1980). Brachylagus idahoensis is an extreme habitat specialist that relies exclusively on big sagebrush (Artemisia tridentata) for food and for protection from predators and thermal extremes; it is also the only native rabbit species that constructs extensive burrow systems (Green and Flinders 1980; Katzner 1994). Because of their dependence on this vegetation type, populations of B. idahoensis are vulnerable to habitat fragmentation, overgrazing, and sagebrush eradication (Holecheck 1981; Dobler and Dixon 1990). Although knowledge of B....
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Brachylagus idahoensis,
Fossil Butte National Monument,
Northwestern Naturalist,
Wyoming,
long distance movements,
|
