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Table 4

Trophic niche overlap (Pianka, 1973) for relative frequency of occurrence (RFO, below the diagonal) and relative biomass consumed (BIO, above the diagonal) for otter diet at three salmonid streams (Y − Ysper, O − Ois, P − Piesting)

  Pianka index of food niche overlap  

Study site Y O P
Y 0.88 0.91
O 0.49 0.99
P 0.60 0.97

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