The reproductive characteristics of the mountain cottontail
rabbit, Sylvilagus nuttalli (Bachman), were investigated from 269
specimens collected in central Oregon between 28 May 1968 and
28 August 1969.
Male rabbits were in breeding condition between mid-February
and 3 July 1969. Nearly 77% of the females bore four litters between
7...
Reproductive characteristics of introduced eastern cottontail
rabbits, Sylvilagus floridanus (J. A. Allen), were determined from
486 rabbits collected between January 1, 1968 and June 30, 1969,
near Corvallis, Oregon.
Sex ratios were 1:1 for all rabbits collected and for all embryos
20 days or more gestation. On the basis of...
Temporal changes in gene frequencies and genotype frequencies,
monthly densities, survival rates, growth rates, trap susceptibility
and home ranges were evaluated from 291 Nuttall's cottontails
(Sylvilagus nuttallii) captured 950 times by livetrapping and 53 cottontails
collected by shooting. Electrophoretic analyses of sera revealed
protein polymorphism at the transferrin locus in...
Descendants of eastern cottontails from Ohio
(Sylvilagns floridanus) introduced in Benton County,
Oregon and cottontails from Ohio were sampled and
analyzed morphometrically and colorimetrically. In
general, Oregon cottontails were smaller and lighter in
color than Ohio rabbits. Introgression and interspecific
competition with the smaller and darker colored native
brush rabbit...
Data from 186 mountain cottontail rabbits (Sylvilaus nuttallii) captured 455 times by livetrapping and from 46 rabbits collected by shooting were evaluated to determine monthly densities, survival rates, extent of movements, dispersion in relation to habitat types, and criteria for determining ages of mountain cottontails. Estimates of density computed for...
A population of Nuttall's cottontails (Sylvilagus nuttallii) in Deschutes County, Oregon, decreased fromm 166 individuals in August 1978 to 76 individuals in August 1979. Survival rates of four annual litter groups in 1978 were 0.74, 0.35, 0.72, and 0.93; survival rates for the same litter groups, respectively, in 1979 were...
