Geology topics
C. L. Douglas
Publications and source records attributed to C. L. Douglas.
Interactions between desert bighorn sheep and feral burros at spring areas in Death Valley National monument
No abstract available at this time
An evaluation of the effects of recreational activities on bighorn in the San Gabriel Mountains, California
No abstract available at this time
Spatial variation in transferrin allele frequencies among herds of feral donkeys in Death Valley National Monument, California
Serum proteins were studied to clarify interrelationships of seemingly disjunct herds of feral donkeys ( Equus asinus ) in the mountains of Death Valley National Monument, California. Sera of 162 donkeys from five localities in the Panamint Mountains were examined by starch-gel electrophoresis to assess polymorphic variation in transferrins. Four homozygous and six heterozygous transferrin phenotypes controlled by four codominant, autosomal alleles were identified with Fe 59 autoradiography. Significant interlocality heterogeneity in genotype distribution and allele frequency distribution among herds was demonstrated. The maximum distance between adjacent herds was 52 km and the minimum distance was 14 km. There are no major physical barriers to movements between herds; furthermore, donkeys are highly mobile animals capable of extensive travel. Behavioral isolation of adjacent herds occurs from May through July, during the peak of reproduction. This isolation is reinforced by fidelity of individuals to their respective home ranges, and to physiological dependence on permanent sources of water. Adjacent herds may overlap during winter when breeding and dependence on water sources are reduced.
Burro impact on bighorn habitat
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Two kinds of small Indian dogs from Black Mesa, Arizona
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Bighorn habitat evaluation and management guidelines for the Grapevine Mountains, Death Valley National Monument
No abstract available at this time
Status of population modeling of the River Mountain herd
No abstract available at this time
Human disturbance at water sources of desert bighorn sheep
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Studies of bighorn-burro interaction in Death Valley: progress toward the objectives
No abstract available at this time
Human disturbance at water sources of desert bighorn sheep
No abstract available at this time
Desert bighorn sheep of the River Mountains, Nevada
No abstract available at this time
Movements of desert bighorn sheep in the Stubbe Spring area, Joshua Tree National Monument
No abstract available at this time
Desert bighorn sheep of the River Mountains, Nevada
No abstract available at this time
Movements of desert bighorn sheep in the Stubbe Spring area, Joshua Tree National Monument
No abstract available at this time
Biota of Lake Mead National Recreation Area, Nevada-Arizona: Amphibians, Reptiles and Mammals
No abstract available at this time
Albumin polymorphism in the feral donkey of Death Valley National Monument, California
No abstract available at this time