TABLE 3.
Summary of one-way analysis of variance (ANOVA) for environmental and biological variables of the Chukchi Sea in 2011 and 2012.
| Variables | 2011 | 2012 | |
| Environmental variables | |||
| Teu (°C) | −1.0 | ns | −0.7 |
| Seu | 30.5 | >∗∗∗ | 29.4 |
| Δσt (kg m–3) | 3.8 | <∗ | 4.8 |
| Ic (%) | 75.0 | >∗∗∗ | 18 |
| Zeu (m) | 74.6 | ns | 59.6 |
| Zm (m) | 13 | ns | 15 |
| NO2 + NO3 (μmol l–1) | 2.52 | ns | 2.00 |
| NH4 (μmol l–1) | 0.54 | ns | 0.66 |
| SiO2 (μmol l–1) | 7.75 | ns | 7.79 |
| PO4 (μmol l–1) | 0.92 | >∗∗ | 0.76 |
| (NO2 + NO3 + NH4): PO4 (mol:mol) | 2.54 | ns | 2.74 |
| (NO2 + NO3 + NH4): SiO2 (mol:mol) | 0.31 | ns | 0.36 |
| Biological variables | |||
| BT | 37.5 | ns | 17.8 |
| BL | 20.7 | ns | 6.9 |
| BM | 2.2 | ns | 2.3 |
| BS | 6.6 | ns | 6.8 |
| Total abundance (106 cells l–1) | 1.5 | ns | 1.4 |
| Diatoms (%) | 31.1 | ns | 49.0 |
| Flagellates (%) | 48.6 | >∗ | 24.5 |
| Unidentified phytoplankton (%) | 20.4 | ns | 26.5 |
The mean values and their significant differences (> or <) between 2011 and 2012 are given. Total abundance: total abundance of phytoplankton averaged over the euphotic zone; Diatoms: relative biovolume of diatoms averaged over the euphotic zone; Flagellates: relative biovolume of flagellates averaged over the euphotic zone; Unidentified phytoplankton: relative biovolume of unidentified nano- and pico-phytoplankton averaged over the euphotic zone. Other abbreviations are defined in Tables 1, 2. ∗p < 0.05, ∗∗p < 0.01, ∗∗∗p < 0.001, ns: not significant. n = 18.