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Table 4 Component communities in R. auricularia and L. stagnalis (reduced dataset) and within-reservoir variations in the levels of larval trematode infections (contrasts in overall prevalence and the prevalence of the dominant species).

From: Larval trematode communities in Radix auricularia and Lymnaea stagnalis in a reservoir system of the Ruhr River

Snail species Trematode species Prevalence (%) Significance of differences (p)
  Baldeneysee Site B1 Site B3a§ Site B3b§ Site B6  
   (n= 20) (n = 76) (n = 20) (n = 22)  
R. auricularia Overall prevalence 15.0 22.4 31.6 18.2 ns
  O. ranae - - 10.5 - 0.018
  D. spathaceum - - 5.3 - ns
  E. recurvatum - 17.1 10.5 18.2 ns
  P. radiatum 15.0 2.6 - - ns
  N. attenuatus - 1.3 - - -
  Echinostoma sp. - 1.3 - - -
R. auricularia Hengsteysee Site He1 Site He2 Site He3 Site He6a  
   (n = 35) (n = 30) (n = 50) (n = 51)  
  Overall prevalence 2.9 76.7 44.0 2.0 0.0001
  T. franki - 26.7 18.0 - 0.0001
  E. recurvatum - 23.3 - 2.0 0.0001
  D. spathaceum - 13.3 4.0 - 0.007
  P. radiatum - - 10.0 - 0.008
  Echinostoma sp. 2.9 3.3 2.0 - -
  P. elegans - 3.3 - - -
  A. burti - 3.3 - - -
  T. clavata - 6.7 - - -
  H. conoideum - - 4.0 - -
  N. attenuatus - - 2.0 - -
  I. melis - - 4.0 - -
L. stagnalis Baldeneysee Site B1 Site B3a Site B4   
   (n = 22) (n = 51) (n = 37)   
  Overall prevalence 4.5 13.7 8.1   ns
  D. pseudospathaceum 4.5 5.9 -   ns
  E. revolutum - 7.8 5.4   -
  P. elegans - - 2.7   -
  1. §Same site sampled twice: on 26 September (a) and on 19 October (b).