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 | −− |