Open Access
Table 3
Trophic niche breadth (Levins 1968) of otters at three salmonid streams (Y: Ysper; O: Ois; P: Piesting). Diet composition expressed as relative frequency of occurrence (RFO%) and relative biomass consumed (BIO%).
| Study site | Method (%) | Levins index of trophic niche breadth | ||||
|---|---|---|---|---|---|---|
| Spring | Summer | Autumn | Winter | Total | ||
| Y | RFO | 0.42 | 0.23 | 0.26 | 0.27 | 0.32 |
| BIO | 0.12 | 0.13 | 0.06 | 0.12 | 0.12 | |
| O | RFO | 0.22 | 0.13 | 0.19 | 0.16 | 0.19 |
| BIO | 0.19 | 0.07 | 0.07 | 0.03 | 0.09 | |
| P | RFO | 0.34 | 0.27 | 0.15 | 0.20 | 0.25 |
| BIO | 0.13 | 0.10 | 0.08 | 0.04 | 0.07 | |
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