POPULATION CYCLES I N SMALL MAMMALS
281
TABLE I11
Measured rates of population growth in the increase phme of the population cycle
for several vole species. Geometric increase is assumed; r is measured as
instantaneow rate per week
Species
Time period
Mean r
Reference
Ckthrionom ys
gbreolus
Microtw
pennsy lvanicus
Microtus
ochrogaster
Microtw
californicus
Lemmw
trimucronatus
March-Dec. 1958
March 1958Jan. 1959
April-July 1966
AprilJuly 1968
April-July 1970
June-Sept. 1933
June-Sept. 1933
March-Sept. 1933
March-Sept. 1934
March-Sept. 1934
March-Sept. 1934
June-Nov. 1965
Dec. 1965-Feb. 1966
Aug.-NOv. 1967
Aug.-Nov. 1969
Aug.-Nov. 1967
Dec. 1967Jan. 1968
MayJuly 1967
Dec. 1967-Jan. 1968
Dec. 1969-Feb. 1970
Aug.-Nov. 1967
Aug.-Nov. 1969
June-Oct. 1965
Nov. 1965-March 1966
June-Oct. 1967
Feb.-Oct. 1968
Aug.-Oct. 1969
NOV. 1969-Feb. 1970
Nov. 1962-March 1963
Nov. 1962July 1963
Jan.-April 1964
May-Oct. 1964
Aug. 196Wune 1967
Oct. 1952-May 1963
Sept. 1951-May 1952
Sept. 1959-May 1960
0.074 Newson (1963)
0.050 Newson (1963)
0.132 Petrusewicz et al. (1971)
0-135 Petrusewicz et al. (1971)
0.129 Andrzejewski and
Rajska (1972)
0.035
0.022
0.051
0.035
0.041
0.040
0.100
0.046
0.063
0.089
0-096
0.029
0.059
0.134
0.032
0.036
0-032
Hamilton (1937)
Hamilton (1937)
Hamilton (1937)
Hamilton (1937)
Hamilton (1937)
Hamilton (1937)
Krebs et al. (1969)
Krebs et al. (1969)
Gaines and Krebs (1971)
Gaines and Krebs (1971)
Gaines and Krebs (1971)
Gaines and Krebs (1971)
Gaines and Krebs (1971)
Gaines and Krebs (1971)
Gaines and Krebs (1971)
Gaines and Krebs (1971)
MyersandKrebs (1971b)
0-037 Krebs et al. (1969)
0.036 Krebs et al. (1969)
0.041 Krebs, unpublished
0-031 Gaines and Krebs (1971)
0.231 MyersandKrebs (1971b)
0.041 Myersand Krebs (1971b)
0.088 Krebs (1966)
0.040 Krebs (1966)
0.091 Krebs (1966)
0.042 Krebs (1966)
0.070 Batzli and Pitelka (197 1)
0.051 Thompson (1955a)
0.115 Thompson (19554
0.083 Krebs (1964a)