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Table 2
Annual and seasonal otter diet composition for three salmonid streams located in Austria (Y: Ysper; O: Ois; P: Piesting). Diet composition is expressed as relative frequency of occurrence and relative biomass consumed (RFO % • BIO %) rounded to integer numbers.
| Study area Y | Study area O | Study area P | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Prey category | Total n = 950 |
Spring n = 218 |
Summer n = 191 |
Autumn n = 154 |
Winter n = 387 |
Total n = 409 |
Spring n = 109 |
Summer n = 99 |
Autumn n = 141 |
Winter n = 60 |
Total n = 813 |
Spring n = 179 |
Summer n = 187 |
Autumn n = 111 |
Winter n = 336 |
| Fish | 49 • 63 | 43 • 64 | 44 • 52 | 68 • 81 | 48 • 59 | 80 • 85 | 71 • 77 | 86 • 89 | 78 • 82 | 88 • 95 | 77 • 84 | 66 • 72 | 71 • 73 | 83 • 85 | 85 • 92 |
| Salmonids | 29 • 56 | 24 • 58 | 25 • 45 | 42 • 75 | 30 • 51 | 27 • 66 | 21 • 39 | 25 • 69 | 26 • 69 | 41 • 85 | 31 • 70 | 24 • 56 | 28 • 63 | 29 • 68 | 37 • 79 |
| Bullhead | 2 • <1 | 2 • <1 | 3 • <1 | 3 • <1 | 2 • <1 | 43 • 11 | 37 • 8 | 55 • 19 | 41 • 12 | 38 • 5 | 35 • 9 | 26 • 8 | 34 • 10 | 49 • 15 | 35 • 8 |
| Cyprinids | 2 • 2 | 1 • 1 | 2 • 1 | 3 • 2 | 4 • 3 | 1 • 1 | 1 • 1 | 1 • 1 | 1 • 1 | 0 • 0 | 3 • 4 | 5 • 7 | 0 • 0 | 1 • 1 | 4 • 4 |
| Pike | < 1 • < 1 | < 1 • < 1 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 |
| Perch | 5 • 4 | 7 • 6 | 5 • 4 | 5 • 4 | 5 • 4 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | < 1 • < 1 | < 1 • < 1 | < 1 • < 1 | < 1 • 1 | < 1 • < 1 |
| Grayling | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 1 • 8 | 4 • 28 | 0 • 0 | 0 • 0 | 1 • 4 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 |
| Undefined | 9 • NA | 10 • NA | 9 • NA | 16 • NA | 7 • NA | 8 • NA | 8 • NA | 6 • NA | 9 • NA | 7 • NA | 8 • NA | 11 • NA | 8 • NA | 4 • NA | 8 • NA |
| Crayfish | 28 • 28 | 19 • 20 | 41 • 41 | 11 • 9 | 33 • 34 | 1 • 2 | 1 • 2 | 1 • 1 | 2 • 2 | 1 • 1 | 3 • 4 | 2 • 3 | 3 • 8 | 6 • 10 | 2 • 3 |
| Birds | 1 • 3 | 1 • 2 | 2 • 4 | 3 • 5 | 1 • 2 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | < 1 • 1 | 0 • 0 | 2 • 9 | 0 • 0 | 0 • 0 |
| Amphibians | 8 • 5 | 17 • 11 | 2 • 1 | 6 • 3 | 7 • 4 | 16 • 12 | 26 • 22 | 3 • 3 | 19 • 15 | 8 • 4 | 8 • 8 | 20 • 22 | 3 • 4 | 3 • 3 | 5 • 4 |
| Reptiles | < 1 • < 1 | 0 • 0 | 0 • 0 | < 1 • < 1 | 0 • 0 | 1 • 1 | 0 • 0 | 3 • 6 | 0 • 0 | 0 • 0 | < 1 • 1 | 0 • 0 | 2 • 4 | < 1 • 1 | 0 • 0 |
| Mammals | 2 • 1 | 3 • 2 | 2 • 1 | 3 • 1 | 2 • 1 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 0 • 0 | 2 • 2 | 2 • 3 | 2 • 3 | < 1 • < 1 | 1 • 1 |
| Insects | 7 • < 1 | 11 • < 1 | 5 • < 1 | 6 • < 1 | 6 • < 1 | 2 • < 1 | 1 • < 1 | 6 • < 1 | 1 • < 1 | 3 • < 1 | 6 • < 1 | 5 • < 1 | 12 • < 1 | 4 • < 1 | 3 • < 1 |
| Undefined | 4 • NA | 5 • NA | 3 • NA | 2 • NA | 3 • NA | < 1 • NA | 0 • 0 | 1 • NA | 0 • 0 | 0 • 0 | 3 • NA | 4 • NA | 4 • NA | 2 • NA | 3 • NA |
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