Results 211 to 220 of about 10,945 (257)

Genetic Composition of Fluctuating Populations of Peromyscus leucopus and Peromyscus maniculatus

Journal of Mammalogy, 1989
Populations of two species of cricetine rodents, Peromyscus leucopus and P. maniculatus , sampled during a 6-year period were analyzed by electrophoresis for genetic variability at 33 presumptive loci. Population densities fluctuated concurrently for both species during this time period.
R. Baccus, J. O. Wolff
openaire   +1 more source

Odontomas in Peromyscus leucopus.

Journal of the National Cancer Institute, 1979
A colony of Peromyscus leucopus was established 15 years ago from animals trapped in the deciduous forest at Argonne National Laboratory, Argonne, Illinois. A roentgenographic survey of the skeletons of 189 of these untreated animals dying during a 13-month period disclosed 48 odontogenic growths in 21 of the mice.
M P, Finkel, L S, Lombard, E F, Staffeldt, P H, Duffy   +3 more
openaire   +1 more source

Prolactin-induced aggression in female Peromyscus leucopus

Behavioral and Neural Biology, 1981
Aggressiveness of female Peromyscus leucopus was markedly altered by manipulation of plasma prolactin levels. Following ovariectomy, females were non-aggressive. When ovariectomized females were injected with an intermediate dosage of prolactin, they became as aggressive as lactating females.
Phyllis E. Gleason, Sandra D. Michael, John J. Christian   +2 more
openaire   +1 more source

Peromyscus leucopus Rafinesque 1818

Peromyscus leucopus Rafinesque, 1818 White-footed Deermouse Peromyscus leucopus are found throughout Louisiana except in the southern coastal parishes. Many of the records reported come from the Mississippi Alluvial Valley. Since Lowery (1974), new specimen records were reported from Allen, Grant, Sabine, Saint James, and Winn parishes.
Hoffman, Justin D., Lester, Courtney, Doucet, Darian, Iguwe, Damilola   +3 more
openaire   +1 more source

Copulatory Behavior of White-Footed Mice (Peromyscus leucopus)

Journal of Mammalogy, 1975
Copulatory behavior was observed in the laboratory for 14 male-female pairs of white-footed mice, Peromyscus leucopus , in a total of 78 tests. P. leucopus displays a basic copulatory pattern with no lock, no intravaginal thrusting, multiple intromissions prerequisite to ejaculation, and multiple ejaculations.
openaire   +2 more sources

Radio-tracking of Peromyscus leucopus

Canadian Journal of Zoology, 1977
Miniature radio transmitters and 'local' triangulation methods were used to monitor the movements of free-ranging Peromyscus leucopus. A sexually mature male and female were studied in detail during two sessions within a 6-week period. Positions were recorded on 107 occasions, giving home ranges of 1.26 ha for the male and 0.91 ha for the female ...
Pierre Mineau, Dale Madison
openaire   +1 more source

Juvenile Molt in Peromyscus leucopus noveboracensis

Journal of Mammalogy, 1956
A survey of the literature indicates that previous workers (Osgood, 1909; Nicholson, 1941; Hamilton, 1943; Cahalane, 1947; Burt, 1949) have been aware of the change from the gray juvenile pelage to the “rufous” or cinnamon red of the adult deer mouse, Peromyscus leucopus noveboracensis , but no investigation has been made of the progress of the pelage ...
openaire   +1 more source

Unseasonal Breeding In Artificial Colonies of Peromyscus Leucopus

Journal of Mammalogy, 1965
Colonies of mice, Peromyscus leucopus , often began to breed soon after being introduced to previously uninhabited islands in midsummer, although natural populations were not breeding at this season. This breeding began when population densities were higher than those of natural populations and continued until densities far higher than those of natural
openaire   +2 more sources

Genetic evidence of promiscuity in Peromyscus leucopus

Behavioral Ecology and Sociobiology, 1991
We collected pregnant female Peromyscus leucopus from natural populations during the summer of 1987 and 1988 and allowed these females to give birth to their field-conceived young in the laboratory. Blood samples were taken by suborbital puncture and phenotypes of five genetic loci (Esterase-1, trasferrin, hemoglobin, albumin and 6-phosphogluconate ...
Xuhua Xia, JohnS. Millar
openaire   +1 more source

Activity of breeding Peromyscus leucopus

Canadian Journal of Zoology, 1980
Activity of lactating and nonbreeding Peromyscus leucopus was examined under seminatural conditions. Lactating females spent significantly more time away from the nest (307 min/night) than nonbreeding females (173 min/night). Increased time away from the nest was related to an increased duration of each activity bout rather than the number of bouts ...
Richard M. Harland, John S. Millar
openaire   +1 more source