Untitled - MendelNet 2013 - Mendelova zemědělská a lesnická ...

MENDELNET 2013Cladocerans were dominant food items in this age group (Fig. 1). Other items were recedent. Theaverage index of fullness was 197.4 ‰ (Fig. 2). Perch in this group consumed significantly lesscladocerans than perch group 0+, more insects than perch 5+ - 7+ , less fish than perch group5+ - 7+ (P < 0.008).Group 5+ – 7+, 84 fish, 6 capturesFish together with macrophytes made dominant food items. Fish eggs and detritus were detected inthe food too. Insects, cladocerans and copepods were recedent (Fig. 1). Index of fullnes was in therange 25.8 – 289.3 ‰ (Fig. 2). Perch in this group consumed significantly less cladocerans thanperch in the groups 0+ and 1+ and more fish than perch of group 1+ (P < 0.008).100%80%60%40%20%fish eggsmacrophytedetritusfishmolluscsinsectscopepodscladocerans0%0+ 1+ 5+-7+Fig. 1: Diet composition (in relative percentage biomass) three age groups of perch300250IF ( o /oo)2001501005000 1 5 - 7 5 - 7 0 5 - 7 5 - 7 0 0 5 - 7VI 2011 VII 2011 X 2011 V 2012 VI 2012 VII 2012 VIII - IX2012age group, month of captureFig. 2: Seasonal dynamics in the index of fullness three age groups of perch795 | P age