Table 3.
PUFA Δ13C for each diet treatment in fish muscle and fish (for fish with weight gain only).
| Diet treatment | Tissue | Δ13CLIN | Δ13CALA | Δ13CARA | Δ13CEPA | Δ13CDHA |
|---|---|---|---|---|---|---|
| Benthic | Liver | 1.4‰ 
|
5.4‰ 
|
6.2‰ 
|
5.5‰ 
|
NA |
| Muscle | 1.1‰ 
|
5.2‰ 
|
5.4‰ 
|
6.0‰ 
|
NA | |
| Terrestrial | Liver | 1.0‰ 
|
−0.2‰ 
|
−0.6‰ 
|
4.3‰ 
|
14.7‰ 
|
| Muscle | 0.8‰ 
|
1.1‰ 
|
−0.6‰ 
|
3.9‰ 
|
13.4‰ 
|
|
| Baseline | Liver | 2.4‰ 
|
0.4‰ 
|
5.6‰ 
|
1.4‰ 
|
0.5‰ 
|
| Muscle | 0.4‰ 
|
2.7‰ 
|
2.4‰ 
|
0.3‰ 
|
−2.0‰ 
|
PUFA, polyunsaturated fatty acids. A positive number indicates the fish tissue is more enriched in δ13CFA than its diet; the larger the number, the larger the isotopic fractionation. Upward arrows indicate enrichment of δ13CFA in tissue relative to diet, while downward arrows indicate depletion of δ13CFA in tissue relative to diet; boldness indicates the size of departure from zero. We did not calculate Δ13C values for mixed treatments because we could not assume that fish were getting an exact 50:50 benthic:terrestrial mix due to selective feeding and competition between fish. NA indicates data were not available for one or more group.