Table 3

Spectral analysis of the individual climatic indices and fur-count records. As in Table 2, the main periods are significant at the 99% level and secondary periods at the 95% level in MTM. The analysis after removing the trend yields the same periods, except 170 years, in the fur-count records and the NHT index.

Time series

Main periods

Secondary periods

NAO

3, 3.5

ENSO

4

2

NHT

170, 2.5

2

Bear

170, 3, 2.5

Beaver

170, 3, 2.5

Fisher

170, 3, 2.5

Fox

170

3, 2.5

Lynx

170, 10, 2.5

3

Marten

170, 3

10, 2.5

Mink

170, 3, 2.5

Muskrat

170, 3

2

Otter

170, 3, 2.5

Wolf

170, 2.5

Wolverene

170, 3, 2.5

Loeuille and Ghil BMC Ecology 2004 4:6   doi:10.1186/1472-6785-4-6