Table 4. Variation in black caiman isotopic values.
Factorial analysis of variance exploring 1) the effect of season (D1, W2, W3) and tissue type (muscle, plasma, and RBCs) on stable carbon and nitrogen isotope values for black caimans in intermediate age classes (B, C) and 2) the effect of tissue type (muscle, plasma, and RBCs) and total length (TL) on stable carbon and nitrogen isotope values for black caimans in all age classes (A,B,C,D). In italics are the results that were significant in the full model.
| δ15N | δ13C | ||||||
|---|---|---|---|---|---|---|---|
| Age class | Variables | dfn, dfd | F | P | F | P | |
| B | Season (D1,W2,W3) | 2, 72 | 0.02 | 0.982 | 1.22 | 0.302 | |
| Tissue | 2, 72 | 20.84 | <0.001 | 0.83 | 0.441 | ||
| Season x Tissue | 4, 72 | 0.23 | 0.919 | 1.42 | 0.236 | ||
| C | Season (D1,W2) | 1, 84 | 2.59 | 0.111 | 0.16 | 0.690 | |
| Tissue | 2, 84 | 122.02 | <0.001 | 7.28 | 0.001 | ||
| Season x Tissue | 2, 84 | 0.43 | 0.654 | 0.48 | 0.621 | ||
| A, B, C, D | Tissue | 2, 219 | 16.21 | <0.001 | 0.07 | 0.936 | |
| TL | 1, 219 | 210.84 | <0.001 | 1.22 | 0.271 | ||
| Tissue x TL | 2, 219 | 0.36 | 0.702 | 0.95 | 0.387 | ||