N | Cr | Ni | Cu | Zn | Cd | Pb | |
---|---|---|---|---|---|---|---|
1988 | 5 | 0.9 ± 0.2 | 0 ± 0 | 6.7 ± 2.2 a | 88.0 ± 6.8 ab | 4.0 ± 1.3 | 8.6 ± 7.5 a |
1993 | 12 | 2.4 ± 2.0 | 20.5 ± 14.6 | 9.3 ± 2.0 a | 120.7 ± 42.0 b | 3.2 ± 1.3 | 7.7 ± 4.5 a |
1994 | 8 | 0.9 ± 0.9 | 29.4 ± 3.9 | 4.4 ± 2.2 a | 123.8 ± 47.5 ab | 2.6 ± 0.4 | 4.9 ± 2.1 ab |
2003 | 5 | 1.1 ± 0.2 | 18.9 ± 2.6 | 21.7 ± 4.2 c | 65.8 ± 8.4 a | 2.3 ± 0.3 | 2.0 ± 0.8 b |
2004 | 5 | 1.0 ± 0 | 22.6 ± 4.6 | 15.3 ± 2.1 b | 102.1 ± 11.9 ab | 2.9 ± 0.4 | 3.0 ± 0.9 ab |
Log transformed | No | No | No | No | No | Yes | |
Sum squares | 8.254 | 809.625 | 928.829 | 11543.927 | 8.462 | 6.521 | |
Mean square | 2.063 | 269.875 | 232.207 | 2885.982 | 2.115 | 1.630 | |
df | 4 | 4 | 4 | 4 | 4 | 4 | |
ANOVA F | 2.391 | 2.592 | 47.482* | 3.246* | 2.175 | 4.200* |