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Table 6 Relative Importance R I (%), Ivlev’s selectivity index (E) and level of selection of harpacticoid species found in the diet of the studied fish species

From: Meiofauna as food source for small-sized demersal fish in the southern North Sea

  Jan 09 May 09 Jul 09 Oct 09 Jan 10
R I (%) R I (%) E Level of selection R I (%) E Level of selection R I (%) E Level of selection R I (%) E Level of selection
B. luteum
 Longipedia spp.b 1.9 94.2 0.7 ++ 98.0 0.5 ++ 94.5 0.8 ++ 47.1 0.7 ++
 H. canaliculatum <0.1 3.3 0.9 ++   2.3 −0.7 −− 9.5 1 ++
 Pseudobradya spp.a 98.1 2.3 −0.7 −− <0.1 −0.9 −− 2 0.7 −− 34.7 0.3 ++
 P. crassicornis <0.1 <0.1 −1 −− <0.1 −1 −− <0.1 −1 −− 1.0 −0.8 −−
 B. aemula <0.1 −1 −− 1.0 1 ++ 0.2 −0.9 −−  
 T. reducta    0.2 −0.9 −− 5.9 1 ++
P. minutus
 Longipedia spp. 47.6 96.6 0.7 ++ 78.8 0.4 ++ 57.1 0.6 ++ 33.0 0.5 ++
 H. canaliculatum   11.4 1 ++ <0.1 −1  
 Pseudobradya spp.a 47.0 3.4 0.6 −− 9.6 0.1 0 42.1 0.6 ++ 53.9 0.5 ++
 E. propinquum 2.7 <0.1 −1 −− <0.1 −1 −− <0.1 −1 −− 7.5 1 ++
 C. tenuipes 2.1   <0.1 −1 −−   5.5 0.1 0
A. laterna
 Pseudobradya spp.a 99.9 99.8 0.8 ++ <0.1 −0.9 −− <0.1 −1 −− <0.1 −1 −−
 Longipedia spp.b <0.1 <0.1 −1 −− <0.1 −0.9 −− 99.8 0.8 ++ 99.7 0.9 ++
L. limanda
 Pseudobradya spp.a 99.8 12.8 −0.1 0 <0.1 −1 −− 15.9 0.1 0 99.8 0.7 ++
 Longipedia spp.b <0.1 87.1 0.7 ++ 99.1 0.5 ++ 84.1 0.7 ++ <0.1 −1 −−
  1. ++ positive selection, −− negative selection, 0 no selection. For Jan09 only R I values are given because only fish stomachs were sampled, not meiofauna in the field
  2. aMainly P. minor
  3. bFurca missing. Completed individuals were mostly identified as L. coronata and L. scotti