Table 3.
Summary of principal component analysis (PCA) of (A) the concentration of macro-nutrients and total FAs in organisms and snow and (B) the specific fatty acid composition at all studied locations (arc-sin-transformed proportions).
| A | B | ||||||
|---|---|---|---|---|---|---|---|
| Analysis of bulk macro-/micronutrients | Analysis of specific FA-composition | ||||||
| PC1 | PC2 | PC3 | PC1 | PC2 | PC3 | ||
| Eigenvalue | 3.72 | 1.76 | 1.10 | Eigenvalue | 8.46 | 3.89 | 1.64 |
| Variance explained (%) | 53.1 | 25.2 | 15.8 | Variance explained (%) | 56.4 | 26 | 10.9 |
| COMPONENT LOADINGS | |||||||
| Particulate concentration | C16:0 | 0.32 | −0.13 | −0.03 | |||
| Total FA:C | −0.09 | 0.63 | −0.43 | C16:1n-9 | 0.22 | −0.3 | −0.31 |
| N:C (molar) | 0.18 | −0.61 | −0.41 | C16:1n-7 | 0.33 | 0.09 | −0.07 |
| P:C (molar) | 0.42 | −0.21 | −0.48 | C16:3 | 0.07 | −0.49 | −0.11 |
| P:N (molar) | 0.4 | 0.38 | −0.28 | C16:4 | −0.27 | −0.03 | 0.41 |
| Nutrient concentration | C18:0 | 0.22 | 0.12 | 0.52 | |||
| NH4 (mg l−1) | −0.41 | 0.03 | −0.54 | C18:1n-7 | 0.33 | 0.08 | −0.05 |
| NO3 (mg l−1) | −0.48 | −0.06 | −0.05 | C18:1n-9 | −0.14 | 0.44 | −0.19 |
| SRP (mg l−1) | −0.47 | -0.18 | −0.21 | C18:2n-6 | −0.02 | −0.48 | −0.21 |
| C18:3n-6 | 0.34 | 0 | 0 | ||||
| C18:3n-3 | −0.21 | −0.26 | 0.27 | ||||
| C18:4n-3 | 0.08 | −0.34 | 0.5 | ||||
| C20:4n-6 | 0.33 | 0.03 | 0.1 | ||||
| C20:4n-3 | 0.33 | 0.08 | 0.08 | ||||
| C20:5n-3 | 0.31 | 0.13 | 0.16 | ||||
Only factors with eigenvalues >1 are shown, thus showing the data for the PC3 axis, which is not depicted in Figure 7.