Table 1.
Multiple regression of population density (#/m2) as a function of year (1992 through 2021) and depth (mean depth of each survey site; 4, 7, 9, and 14 m). Independent regressions of population density as a function of year at each depth
| Source | DF | Type III SS | Mean square | F | P |
|---|---|---|---|---|---|
| Year | 1 | 0.0059 | 0.0059 | 0.09 | 0.7583 |
| Depth | 1 | 13.1529 | 13.1529 | 210.28 | <0.0001 |
| Error | 583 | 36.4659 | 0.0625 | ||
| Corrected total | 585 | 49.6955 | |||
| Depth = 4 m | |||||
| Year | 1 | 0.0213 | 0.0213 | 0.06 | 0.8128 |
| Error | 33 | 12.3308 | 0.3737 | ||
| Corrected total | 34 | 12.3521 | |||
| Depth = 7 m | |||||
| Year | 1 | 0.0116 | 0.0116 | 0.29 | 0.5882 |
| Error | 140 | 5.5030 | 0.0393 | ||
| Corrected total | 141 | 5.5146 | |||
| Depth = 9 m | |||||
| Year | 1 | 0.0269 | 0.0269 | 2.41 | 0.1217 |
| Error | 331 | 3.6976 | 0.0112 | ||
| Corrected total | 332 | 3.7245 | |||
| Depth = 14 m | |||||
| Year | 1 | 0.0065 | 0.0065 | 2.52 | 0.1167 |
| Error | 74 | 0.1897 | 0.0026 | ||
| Corrected total | 75 | 0.1961 |
DF = degrees of freedom; SS = sums of squares, F = F statistic, P = probability level.