Ábrahám Levente (szerk.): Válogatott tanulmányok V. - Natura Somogyiensis 17. (Kaposvár, 2010)

LANSZKI, J., MÓROCZ, A. & CONROY, J. W. H.: A vidra (Lutra lutra) kora tavaszi táplálék-összetétele a Gemenci Tájegység (Duna-Dráva Nemzeti Park, Magyarország) természetes élőhelyein

320 NATURA SOMOGYIENSIS Table 2: Early spring non-fish diet of otters living in Gemenc Area, Hungary. •fish and non-fish items together, + = hiomass under 0.05%, B

A = standardized trophic niche breadth, for abbreviations see Table 1. Food item TD HS HK DD ND BD N %B N %B N %B N %B N %B N %B Frog Rana spp. 1 2.4 2 1 1 3 Toad Bufo spp. 1 0.8 Unidentified amphibians 6 6.8 1 + 6 2.1 6 3.3 4 0.1 Crayfish Astacus spp. 5 6.6 Water beetles 3 0.2 2 + 4 + 9 0.2 Molluscs (Mollusca) 1 + 1 + Number of spraints 34 55 45 39 21 85 Number of items* 49 75 60 56 26 148 Trophic niche breadth (B

A) 0.13 0.00 0.03 0.05 0.00 0.00 a) 100% TJ I 73% H 30% 25% CQ 0% J Fish weight (g): • 1000< Q 301-1000 a 10D-500 • <100 TD HS HKDD ND BD Ansa to HS HK TP DD ND BD Relative distance 5 10 15 20 25 H 1 1 1 1 J Fig. 3: Distribution of fish weight categories in the diet of otters (a) and dendogram of diet similarity (b) in the Gemenc Area, Hungary. For locations and other explanation see Fig. 1 and Fig. 2. a) Tj I 100% i a) Tj I 75% • 0 u s30% • c 23% • ffl 0% J OS | n B 1 Fish guild: • StagnophyHc DReophyüc • Euiytopic TD HS HKDD ND BD Area HK ND TD DD BD HS Relative distance 5 10 15 20 25 —I J Fig. 4: Distribution of fish guild categories in the diet of otters (a) and dendogram of diet similarity (b) in the Gemenc Area, Hungary. For locations and other explanation see Fig. 1 and Fig. 2.™