362
CHARLES J. KREBS AND JUDITH H. MYERS
A
C
70.
I
I
I
8
60 -
I
I
I
I
50
POOR WEATHER
-
-
-
-
1
2
3
4
5
707
60 -
FAVORABLE W E A THER
-
5 0 -
I
2
3
4
5
1954
1955
1956
1957
1958
YEAR
FIG. 38. Parts A and B demonstrate possible situations in which weather might
act to bring two asynchronous vole populations into synchrony. I n A poor
weather conditions have a strong influence on a peak population while having
little influence on a population in the phase of increase. In B favorable weather
extends the duration of peak population density in one population and accelerates
CHARLES J. KREBS AND JUDITH H. MYERS
A
C
70.
I
I
I
8
60 -
I
I
I
I
50
POOR WEATHER
-
-
-
-
1
2
3
4
5
707
60 -
FAVORABLE W E A THER
-
5 0 -
I
2
3
4
5
1954
1955
1956
1957
1958
YEAR
FIG. 38. Parts A and B demonstrate possible situations in which weather might
act to bring two asynchronous vole populations into synchrony. I n A poor
weather conditions have a strong influence on a peak population while having
little influence on a population in the phase of increase. In B favorable weather
extends the duration of peak population density in one population and accelerates