Open Access
Table 4
Dietary composition of the Evrotas chub from the perennial and the intermittent site, displayed as frequency of occurrence (Fo, %) and numeric abundance (Ai, %) from non-empty guts. Pooled data for aquatic prey and terrestrial prey (including all adult invertebrate forms) are also presented. L: larvae; P: pupa; A: adult.
| Perennial | Intermittent | ||||
|---|---|---|---|---|---|
| (n = 29) | (n = 37) | ||||
| Prey Categories | Fo% | Ai% | Fo% | Ai% | |
| Aquatic prey | |||||
| Acari | Hydrachnidae | 2.70 | 0.20 | ||
| Coleoptera | Elmidae (A.) | 3.45 | 0.20 | 2.70 | 0.10 |
| Elmidae (L.) | 3.45 | 0.20 | |||
| Helophoridae (A.) | 2.70 | 0.10 | |||
| Diptera | Athericidae (L.) | 5.41 | 0.20 | ||
| Ceratopogonidae (L.) | 3.45 | 0.20 | 5.41 | 0.20 | |
| Chironomidae (L.) | 68.97 | 11.38 | 51.35 | 24.26 | |
| Chironomidae (P.) | 3.45 | 0.40 | 5.41 | 0.51 | |
| Dixidae (L.) | 3.45 | 0.20 | 8.11 | 0.31 | |
| Limonidae (L.) | 20.69 | 1.40 | 18.92 | 0.82 | |
| Simulidae (L.) | 24.14 | 2.79 | 8.11 | 0.51 | |
| Stratiomyidae (L.) | 6.90 | 0.40 | 5.41 | 0.20 | |
| Tipulidae (L.) | 3.45 | 0.40 | |||
| Anthomyidae (L.) | 27.03 | 4.50 | |||
| Unidentified Diptera (P.) | 13.79 | 1.20 | |||
| Ephemeroptera | Baetidae (L.) | 24.14 | 2.79 | 35.14 | 2.66 |
| Baetidae (P.) | 3.45 | 0.20 | |||
| Ephemeridae (L.) | 17.24 | 1.60 | 40.54 | 2.25 | |
| Ephemerillidae (L.) | 10.34 | 0.60 | |||
| Heptagenidae (L.) | 24.14 | 1.60 | 16.22 | 1.23 | |
| Leptophlebidae (L.) | 10.34 | 1.00 | 5.41 | 0.51 | |
| Unidentified Ephemeroptera (L.) | 17.24 | 1.00 | |||
| Lepidoptera | Lepidoptera (L.) | 6.90 | 0.40 | 2.70 | 0.10 |
| Nematoda | Nematoda | 48.28 | 6.19 | 56.76 | 7.98 |
| Odonata | Calopterygidae (L.) | 3.45 | 0.20 | ||
| Gomphidae (L.) | 5.41 | 0.20 | |||
| Oligochaeta | Oligochaeta | 10.34 | 0.60 | ||
| Plecoptera | Perlidae (L.) | 8.11 | 0.72 | ||
| Perlodidae (L.) | 6.90 | 0.80 | 24.32 | 2.76 | |
| Unidentified Plecoptera (L.) | 3.45 | 0.20 | |||
| Trichoptera | Hydropsychidae (L.) | 17.24 | 1.60 | 13.51 | 0.61 |
| Hydroptilidae (L.) | 24.14 | 1.60 | 8.11 | 0.31 | |
| Leptoceridae (L.) | 48.28 | 43.11 | 2.70 | 0.10 | |
| Philopotamidae (L.) | 3.45 | 0.20 | |||
| Polycentropodidae (L.) | 2.70 | 0.31 | |||
| Psychomyidae (L.) | 2.70 | 0.10 | |||
| Unidentified Trichoptera (L.) | 10.34 | 0.80 | |||
| Unidentified Trichoptera (P.) | 6.90 | 0.40 | |||
| Total Aquatic prey | 93.10 | 83.63 | 89.19 | 51.79 | |
| Terrestrial prey | |||||
| Aranea | Aranea | 3.45 | 0.40 | 8.11 | 0.31 |
| Chilopoda | Chilopoda | 3.45 | 0.20 | ||
| Coleoptera | Staphylinidae (A.) | 6.90 | 0.40 | ||
| Unidentified Coleoptera (A.) | 40.54 | 2.46 | |||
| Diptera | Ceratopogonidae (A.) | 2.70 | 0.41 | ||
| Chironomidae (A.) | 20.69 | 3.39 | 50.05 | 40.94 | |
| Empididae (A.) | 41.38 | 9.78 | 24.32 | 2.76 | |
| Unidentified Diptera (A.) | 6.90 | 0.40 | |||
| Ephemeroptera | Baetidae (A.) | 2.70 | 0.10 | ||
| Hymenoptera | Hymenoptera (A.) | 3.45 | 0.40 | ||
| Trichoptera | Unidentified Trichoptera (A.) | 3.45 | 0.40 | ||
| Unidentified items | Unidentified items | 10.34 | 1.00 | 16.22 | 1.23 |
| Total Terrestrial prey | 55.17 | 16.37 | 78.38 | 48.21 | |
| Algae and plants | 17.24 | 27.03 | |||
| Total prey | 501 | 977 | |||
| % VI (n total fish examined) | 12.12 (33) | 5.13 (39) | |||
| FI (mean) | 2.48 | 3.10 | |||
| Mean n items consumed | 17.28 | 26.41 | |||
| Number of prey categories | 39 | 33 | |||
| Shannon's diversity H' | 2.31 | 2.02 | |||
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