Fish size selection and diet composition of Eurasian otters (Lutra lutra) in salmonid streams: Picky gourmets rather than opportunists? | Knowledge and Management of Aquatic Ecosystems

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Table 6

Manly's selection ratios and indices for salmonid fish size classes in the diet of otters in three salmonid streams (Y: Ysper; O: Ois; P: Piesting). Significant values are set in bold, considering a Bonferroni correction.

Study site	Diet measure	Fish size class	Proportion used	Proportion available	Selection ratio w_i	w_i SE	P-value	Standardized index B_i
Y	RFO%	A < 120 mm	0.38	0.82	0.465	0.024	< 0.001	0.031
		B 120–250 mm	0.47	0.17	2.780	0.220	< 0.001	0.184
		C > 250 mm	0.15	0.01	11.854	3.326	0.001	0.785
	BIO%	A < 120 mm	0.05	0.20	0.259	0.006	< 0.001	0.062
		B 120–250 mm	0.39	0.63	0.622	0.005	< 0.001	0.148
		C > 250 mm	0.55	0.17	3.310	0.054	< 0.001	0.790

O	RFO%	A < 120 mm	0.13	0.32	0.396	0.078	< 0.001	0.144
		B 120–250 mm	0.68	0.43	1.570	0.097	< 0.001	0.572
		C > 250 mm	0.19	0.24	0.778	0.125	0.074	0.283
	BIO%	A < 120 mm	0.01	0.02	0.692	0.047	< 0.001	0.220
		B 120–250 mm	0.54	0.30	1.792	0.016	< 0.001	0.570
		C > 250 mm	0.45	0.68	0.659	0.006	< 0.001	0.210

P	RFO%	A < 120 mm	0.38	0.66	0.577	0.034	< 0.001	0.142
		B 120–250 mm	0.52	0.28	1.852	0.130	< 0.001	0.454
		C > 250 mm	0.10	0.06	1.651	0.309	0.035	0.405
	BIO%	A < 120 mm	0.07	0.11	0.639	0.016	< 0.001	0.233
		B 120–250 mm	0.53	0.42	1.252	0.010	< 0.001	0.456
		C > 250 mm	0.40	0.47	0.857	0.008	< 0.001	0.312

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