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49 50 51 52 53 54 55 56 57 58 59 60 Years

Figure 18.5 Annual fluctuations in the numbers of four irruptive species counted while migrating over Falsterbo in southern Sweden, 1950-1960. From Ulfstrand et al. (1974).

r2=71.63

p=0.004

r2=71.63

p=0.004

Birch crop index

Birch crop index

2 3 Birch crop index

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