Table 1 Food web samples from Lake Templin (Potsdam, Germany) and their respective characteristics: age, lipid content, stable isotope values of whole fish in case of fish, and calculated trophic positions (TP) using a δ15N enrichment of 2.3‰ per TP
Sample | Scientific name | Detailed description | Age (y) | Lipid content (%) ± SD | Water content (%) | Protein content (mg/g) ± SD | δ13C (‰) ± SD | δ15N (‰) ± SD | Calculated TP |
|---|---|---|---|---|---|---|---|---|---|
Plankton fraction (200 µm) | – | – | – | 0.52 | 90 | 14.3 ± 1.0 | − 34.4 ± 0.2 | 14.7 ± 0.1 | 1.3 |
Dreissena, small | Dreissena polymorpha | Soft tissue (incl. breathing water) of mussels < 2 cm shell length | ≤ 2.5 | 0.5 ±  < 0.1 | 97.0/95.9* | 22.1 ± 0.9 | − 31.3 ± 0.1 | 16.4 ± 0.1 | 2.1 |
Dreissena, large | Dreissena polymorpha | Soft tissue (incl. breathing water) of mussels > 2 cm shell length | ≥ 2.5 | 0.3 ±  < 0.1 | 98.9/97.1* | 15.9 ± 0.4 | − 32.0 ± 0.1 | 16.1 ± 0.1 | 1.9 |
White bream | Blicca bjoerkna | Pool of 3 individual fish, GIT removed (length 28–30 cm) | 5+–6+ | 7.4 ± 0.1 | 71.2 | 49.2 ± 0.8 | − 29.2 ± 0.9§ | 18.6 ± 0.2§ | 3.0 |
Roach | Rutilus | Pool of 3 individual fish, GIT removed (length 35–36 cm) | 9+–10+ | 6.2 ±  < 0.1 | 70.5 | 53.1 ± 2.7 | − 29.0 ± 0.4§ | 18.9 ± 0.4§ | 3.1 |
Roach, small | Rutilus | Pool of 17 individual whole fish (length: 9–11 cm) | < 1 | 4.6 ± 0.1 | 79.5 | 56.2 ± 11.3 | − 29.1 ± 0.1 | 19.2 ± 0.1 | 3.3 |
Bleak | Alburnus | Pool of 15 individual whole fish (length: 10–13 cm) | < 1 | 13.0 ± 0.1 | 72.1 | 53.3 ± 2.7 | − 28.7 ± 0.1 | 19.3 ± 0.1 | 3.3 |
Perch, small | Perca fluviatilis | Pool of 20 individual whole fish (length: 7–10 cm) | < 1 | 3.4 ±  < 0.1 | 77.4 | 15.3 ± 1.7 | − 28.0 ± 0.1 | 20.0 ± 0.1 | 3.6 |
Pike | Esox lucius | Pool of 2 individual fish, GIT removed (length 36–42 cm) | 2+ | 2.8 ± 0.1 | 78.2 | 40.0 ± 2.1 | − 28.0 ± 0.8§ | 20.6 ± 0.8§ | 3.9 |
Asp | Aspius | Pool of 2 individual fish, GIT removed (length 60–62 cm) | 5+–7+ | 11.4 ± 0.7 | 69.3 | 53.0 ± 3.6 | − 27.8 ± 0.1§ | 21.2 ± 0.7§ | 4.2 |
Perch 1 | Perca fluviatilis | Individual fish, GIT removed (length 41 cm) | 10+ | 5.4 ± 0.1 | 70.1 | 47.0 ± 0.7 | − 27.0 ± 0.1 | 21.1 ± 0.1 | 4.1 |
Perch | Perca fluviatilis | Pool of 2 individual fish, GIT removed (length 28–32 cm) | 6+ | 5.9 ± 0.1 | 73.0 | 44.2 ± 4.3 | − 26.7 ± 0.4§ | 21.3 ± 0.5§ | 4.2 |
Pike-perch A | Sander lucioperca | Pool of 3 individual fish, GIT removed (length 21–31 cm) | 1+ | 2.4 ± 0.1 | 78.1 | 41.1 ± 1.6 | − 27.6 ± 0.1§ | 21.5 ± 0.1§ | 4.3 |
Pike 1 | Esox lucius | Individual fish, GIT removed (length 68 cm) | 5+ | 3.0 ±  < 0.1 | 75.9 | 44.2 ± 1.5 | − 26.8 ± 0.1 | 21.6 ± 0.1 | 4.3 |
Pike-perch | Sander lucioperca | Pool of 3 individual fish, GIT removed (length 24–26 cm) | 1+ | 2.0 ±  < 0.1 | 78.6 | 41.0 ± 1.3 | − 26.3 ± 0.1§ | 22.4 ± 0.1§ | 4.7 |