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Table 2 The dietary compositions of P. fulvldraco and C. heterodon revealed by gut content analysis and the stable isotope signatures

From: Initial response of fish trophic niche to hydrological alteration in the upstream of Three Gorges Dam

Food sources Diets of P. fulvldraco Diets of C. heterodon
% δ13C δ15N % δ13C δ15N
Terrestrial plants - - - - - -
Plant debris - - - 14.5 −25.1 1.7
Phytoplankton 8.5 −23.8 5.3 23.0 −23.2 4.2
Beneath algae - - - 8.5 −22.9 10.3
Zooplankton 27.0 −22.9 6.7 21.5 −23.7 6.2
Shrimp 12.5 −21.5 8.7 - - -
Mollusk 32.5 −22.1 7.4 27.5 −22.6 6.9
Fish 19.5 −20.7 11.4 5.0 −21.5 9.2
Bulk diet   −22.1 8.2   −22.5 6.6
Discrimination (Δ)   +0.47 3.3   −0.51 2.9
  1. “-” indicates that the food items were not found in the consumers’ guts