Table 2 Mean (± SD) stable isotope values of carbon and nitrogen of food sources at each site in Valla Stream in summer and autumn.
Sites | Food sources | Summer | Autumn | ||||
|---|---|---|---|---|---|---|---|
N | δ13C | δ15N | N | δ13C | δ15N | ||
Macroinvertebrates | 3 | − 26.74 ± 1.11 | 3.08 ± 1.28 | 3 | − 29.53 ± 2.33 | 2.31 ± 0.99 | |
S1 | Crayfish | – | − 26.34 ± 0.60 | 4.66 ± 0.30 | – | − 26.15 ± 0.86 | 4.71 ± 0.41 |
Detritus | 3 | − 28.01 ± 0.05 | − 1.57 ± 0.10 | 3 | − 30.01 ± 0.62 | − 2.44 ± 0.63 | |
Periphyton | – | − 26.88 ± 1.99 | 1.91 ± 1.46 | 3 | − 27.32 ± 0.30 | 0.88 ± 0.12 | |
Macrophytes | 3 | − 39.61 ± 0.20 | 1.92 ± 0.35 | 3 | − 39.20 ± 0.10 | 0.86 ± 0.16 | |
Macroinvertebrates | 3 | − 27.92 ± 1.89 | 2.60 ± 1.30 | 3 | − 30.41 ± 2.88 | 2.72 ± 0.82 | |
S2 | Crayfish | – | − 26.47 ± 0.60 | 4.97 ± 0.55 | – | − 26.76 ± 0.32 | 4.81 ± 0.54 |
Detritus | 3 | − 28.92 ± 0.36 | − 2.07 ± 0.03 | 3 | − 29.06 ± 0.46 | − 2.62 ± 0.24 | |
Periphyton | – | − 26.88 ± 1.99 | 1.91 ± 1.46 | 3 | − 28.24 ± 2.16 | 1.89 ± 1.38 | |
Macrophytes | 3 | − 40.52 ± 0.72 | 0.42 ± 0.17 | 3 | − 39.59 ± 0.08 | 1.10 ± 0.21 | |
Macroinvertebrates | 3 | − 27.83 ± 1.34 | 3.95 ± 2.24 | 3 | − 29.52 ± 1.65 | 3.77 ± 1.08 | |
S3 | Crayfish | – | − 26.55 ± 0.76 | 6.11 ± 1.69 | – | − 26.42 ± 0.52 | 6.42 ± 0.97 |
Detritus | 3 | − 29.18 ± 0.38 | − 1.53 ± 0.31 | 3 | − 29.76 ± 0.73 | − 2.15 ± 0.31 | |
Periphyton | – | − 26.88 ± 1.99 | 1.91 ± 1.46 | 3 | − 24.26 ± 0.74 | 2.65 ± 0.45 | |
Macrophytes | 3 | − 39.15 ± 0.49 | 0.34 ± 0.038 | 3 | − 38.85 ± 0.03 | 0.85 ± 0.18 | |
