Table 2
Number of prey items and frequency of occurrence of each food category recorded in stomachs of brown trout and brook trout, from Czech streams Malá Jeřice (allopatric brown trout), Černá Nisa (allopatric brook trout) and Malý Štolpich (sympatry). n – total number of stomachs examined; N – total number of prey items in each category; N (%) – average proportion of each category in the stomachs.
| Prey category | Brown trout | Brook trout | ||||||
|---|---|---|---|---|---|---|---|---|
| Allopatry | Sympatry | Allopatry | Sympatry | |||||
| n = 58 | n = 58 | n = 71 | n = 48 | |||||
| N | N (%) | N | N (%) | N | N (%) | N | N (%) | |
| Aquatic | ||||||||
| Megaloptera | 1 | 0.1 | – | – | 1 | – | 1 | – |
| Ephemeroptera | 17 | 1.1 | – | – | 18 | 0.8 | 1 | – |
| Plecoptera | 58 | 3.7 | 23 | 1.5 | 208 | 9.2 | 29 | 1.3 |
| Trichoptera | 221 | 13.9 | 251 | 16.6 | 233 | 10.3 | 141 | 6.1 |
| Coleoptera | 3 | 0.2 | 10 | 0.7 | 2 | – | 3 | – |
| Diptera | 619 | 39.0 | 320 | 21.2 | 1128 | 50.0 | 481 | 20.9 |
| Oligochaeta | 2 | 0.1 | – | – | – | – | – | – |
| Hydracarina | – | – | – | – | 1 | – | 81 | 3.5 |
| Terrestrial | ||||||||
| Megaloptera | – | – | 1 | 0.1 | 3 | 0.1 | 4 | 0.2 |
| Trichoptera | 7 | 0.4 | 3 | 0.2 | 8 | 0.4 | 2 | 0.1 |
| Diptera | 97 | 6.1 | 117 | 7.7 | 197 | 8.7 | 161 | 7.0 |
| Hymenoptera | 155 | 9.8 | 225 | 14.9 | 225 | 10.0 | 337 | 14.7 |
| Heteroptera | 10 | 0.6 | 46 | 3.0 | – | – | 126 | 5.5 |
| Coleoptera | 151 | 9.5 | 275 | 18.2 | 121 | 5.4 | 400 | 17.4 |
| Lepidoptera | – | – | 3 | 0.2 | – | – | 6 | 0.3 |
| Dermaptera | – | – | 2 | 0.1 | – | – | 3 | 0.1 |
| Aphidomorpha | 215 | 13.6 | 142 | 9.4 | 51 | 2.3 | 344 | 15.0 |
| Psyllomorpha | 23 | 1.5 | 42 | 2.8 | 2 | 0.1 | 84 | 3.7 |
| Araneida | – | – | 20 | 1.3 | 4 | 0.2 | 9 | 0.4 |
| Auchenorrhyncha | 6 | 0.4 | 32 | 2.1 | 10 | 0.4 | 72 | 3.1 |
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