Physiological correlations of population density in the eastern chipmunk (Tamias striatus) and the white-footed mouse (Peromyscus leucopus)

1969 ◽  
Vol 47 (3) ◽  
pp. 427-433 ◽  
Author(s):  
F. V. Clulow ◽  
A. DesMarais ◽  
J. Vaillancourt
Keyword(s):  
Population Density ◽  
Adrenal Cortex ◽  
Control Mechanism ◽  
Peromyscus Leucopus ◽  
Physiological Control ◽  
Tamias Striatus ◽  
Adrenocortical Activity ◽  
Eastern Chipmunk ◽  
Eastern Chipmunks ◽  
White Footed Mouse

Populations of various densities of eastern, chipmunks (Tamias striatus lysteri (Richardson) and white-footed mice (Peromyscus leucopus noveboracensis (Fischer) were formed by the introduction of wild-trapped animals onto islands of different size on Heney (Little Whitefish) Lake, Quebec.The animals were subsequently recaptured and various indicators of adrenocortical activity, including levels of circulating eosinophils and plasma corticostcroids, were measured. The evidence indicated that activation of the adrenal cortex is directly correlated with population density in T. striatus but not in P. leucopus.The conclusions are discussed in relation to current theories on the regulation of mammalian population including J. J. Christian's hypothetical behavioural–physiological control mechanism.

Genic homogeneity among temporal populations of the eastern chipmunk (Tamias striatus)

1990 ◽  
Vol 68 (10) ◽  
pp. 2169-2173 ◽  
Author(s):  
Matthew M. White ◽  
Gerald E. Svendsen
Keyword(s):  
Age Structure ◽  
Allozyme Variation ◽  
Allozyme Analysis ◽  
Tamias Striatus ◽  
Resident Population ◽  
Eastern Chipmunk ◽  
Genotype Frequencies ◽  
Eastern Chipmunks

A population of eastern chipmunks (Tamias striatus) was surveyed for allozyme variation over two distinct reproductive seasons each year during 1987 and 1988. Individuals were placed into resident, recruit, and disappearing individual categories for the allozyme analysis. The resident population declined by 43% during the period of the study. Individuals in the recruit and emigrant categories accounted for about 50% of the population each season and the number in each of these categories varied widely from season to season. No inbreeding, based on genotype frequencies, was observed within the resident population. No significant genic heterogeneity was observed among temporally separated populations of chipmunks in the resident, recruit, or disappearing individual categories. The high levels of additions and losses from the population and the complex age-structure of chipmunk populations were likely the major contributors to the lack of inbreeding and seasonal differentiation. These results are contrasted with the more widely studied microtine systems.

Population regulation in white-footed mice (Peromyscus leucopus) in a suboptimal habitat

1991 ◽  
Vol 69 (1) ◽  
pp. 76-81 ◽  
Author(s):  
Alicia V. Linzey ◽  
Michael H. Kesner
Keyword(s):  
Phase Space ◽  
Population Density ◽  
Population Regulation ◽  
Reproductive Effort ◽  
Peromyscus Leucopus ◽  
Demographic Structure ◽  
Overwinter Survival ◽  
Annual Basis ◽  
Period Data ◽  
White Footed Mouse

A white-footed mouse (Peromyscus leucopus) population living in a suboptimal habitat was monitored weekly throughout the year over a 4-year period. Data obtained were used to examine the hypothesis that populations living in suboptimal habitats are not self-regulating. A total of 880 different mice were handled on 3023 occasions. Population density fluctuated on both a seasonal and an annual basis, and differences in demographic structure among years included shifts in predominance of subadults versus adults, proportion of the population composed of juveniles, survivorship of males, and reproductive effort. In general, the 2nd year was distinctive in that it was lower in density, dominated by subadults, had few juveniles, poor overwinter survival, and low reproductive effort. A phase space plot of density against proportion of females breeding indicated that reproductive effort was being regulated in response to density, suggesting that this suboptimal habitat population was self-regulating.

Hibernation of eastern chipmunks (Tamias striatus) maintained under controlled conditions

1972 ◽  
Vol 50 (1) ◽  
pp. 95-105 ◽  
Author(s):  
Grace Workman Scott ◽  
Kenneth C. Fisher
Keyword(s):  
Temperature Sensors ◽  
Endogenous Rhythm ◽  
Bottom Temperature ◽  
Tamias Striatus ◽  
Controlled Conditions ◽  
Eastern Chipmunks ◽  
First Time ◽  
Periodic Arousals

The hibernation pattern of captive eastern chipmunks maintained under controlled conditions of light and temperature was examined. It was consistent with the view that hibernation results from an endogenous rhythm with a periodicity of about a year, probably temperature independent.Continuous recording from nest bottom temperature sensors was tested for the first time with this species and found to be more accurate than the sawdust technique for detecting arousals. It also provided useful information about trends in body temperature.The hypothesis that a shift in the temperature at which heat-producing responses are mobilized occurs during hibernation and that it is responsible for the pattern of periodic arousals, is discussed in relation to the observations made.

Seasonal Study of Spontaneous Daily Torpor in the White-Footed Mouse, Peromyscus leucopus

1978 ◽  
Vol 51 (3) ◽  
pp. 289-299 ◽  
Author(s):  
G. Robert Lynch ◽  
F. Daniel Vogt ◽  
Harvey R. Smith
Keyword(s):  
Peromyscus Leucopus ◽  
Daily Torpor ◽  
Seasonal Study ◽  
White Footed Mouse
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