Table 1.
Variance estimates from analysis of variance of tree effects and year effects from population censuses of O. brumata and T. viridana from Wytham Woods, England
| Sums of squares
|
Variance explained
|
||||||
|---|---|---|---|---|---|---|---|
| Total | Tree | Year | Error | Tree, % | Year, % | Error, % | |
| O. brumata | 121.80 | 27.50 | 83.30 | 11.00 | 22.6 | 68.4 | 9.0 |
| T. viridana | 41.51 | 5.10 | 22.65 | 13.76 | 12.3 | 54.6 | 33.1 |
Data were collected from five Q. robur trees from 1951 to 1966 (80 observations per insect species). The time–series for T. viridana was detrended before analysis (see text for details).