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Table 5
Relative biomass density of phytoplankton in gut content (GC) and faecal pellets (FP), degree of selection (E) and efficiency of assimilation (A) of P. geimermassardi.
| Phytoplankton | Jun-GC | Jun-FP | Jun-E | Jun-A | Jul-GC | Jul-FP | Jul-E | Jul-A | Aug-GC | Aug-FP | Aug-E | Aug-A |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ultraplankton | 9.4 [7.7; 10.5] | 0 | 0.1 [0.1; 0.1] | −1 | 5.2 [3.8; 7.9] | – | −0.2 [−0.2; −0.2] | −1 | 11.9 [9.8; 13.5] | – | 0.2 [0.2; 0.3] | −1 |
| R. curvata | 5.4 [3.8; 6.3] | 7.5 [6.2; 8.6] | 0.2 [0.2; 0.2] | 0.2 [0; 0.4] | 6.2 [3.8; 7.7] | 4.1 [2.7; 5.5] | 0.3 [0.1; 0.5] | −0.4 [−0.5; −0.3] | 6.9 [3.8; 8.9] | 7.4 [6.3; 8.6] | 0.3 [0.3; 0.4] | 0.1 [−0.1; 0.4] |
| A. falcatus | 7.3 [5.4; 8.8] | 3.5 [2.8; 4.2] | 0.6 [0.5; 0.6] | −0.3 [−0.4; −0.3] | 3.4 [3.8; 7.7] | 0.9 [0.7; 1.3] | 0.4 [0.2; 0.6] | −0.5 [−0.8; −0.3] | – | – | – | – |
| A. spiralis | – | – | – | – | 1.4 [0.7; 2.8] | – | −0.4 [−0.4; −0.3] | –1 | – | – | – | – |
| C. microporum | – | – | – | – | – | – | – | – | 2.8 [1.5;4.4] | – | 0.2 [0.1; 0.3] | −1 |
| C. quadrata | 10.3 [7.4; 13.2] | – | 0.7 [0.7; 0.7] | –1 | – | – | – | – | 1.2 [0.2; 2.2] | – | −0.5 [−0.8; −0.2] | −1 |
| K. obesa | 10.4 [8.6; 13.2] | – | 0.5 [0.5; 0.6] | −1 | 5.6 [1.2; 9.3] | – | 0.4 [0.4; 0.5] | −1 | – | – | – | – |
| P. duplex | 0.2 [0.2; 0.3] | – | −1 [−1; −0.9] | −1 | 0.2 [0.1; 0.3] | – | −1 [−1; −0.9] | −1 | – | – | – | – |
| S. ecornis | 4.8 [2.8; 5.9] | 15.9 [14.9; 16.8] | −0.1 [−0.3; 0] | 0.5 [0.5; 0.7] | 6.0 [4.8; 7.0] | 13.6 [13.1; 13.9] | 0.1 [0.1; 0.2] | 0.4 [0.3; 0.5] | – | – | – | – |
| S. ellipsoideus | 5.2 [3.8; 6.2] | 8.6 [7.2; 9.8] | 0.2 [0.2; 0.3] | 0.2 [0.1; 0.4] | 3.6 [1.4;6.6] | 7.0 [5.7;8.4] | 0.3 [0.1; 0.4] | 0.6 [0.4; 0.7] | 12.1 [9.2; 14.0] | 7.0 [4.6; 9.3] | 0.5 [0.4; 0.6] | −0.3 [−0.5; −0.1] |
| S. quadricauda | 0.8 [0.3; 1.1] | – | −0.5 [−0.8; −0.4] | −1 | 6.0 [3.0; 7.5] | – | 0.4 [0.4; 0.4] | −1 | 5.5 [4.4; 6.5] | – | 0.1 [0; 0.2] | −1 |
| S. bibraianum | 5.3 [4.5; 6.2] | 17.4 [16.2; 18.8] | −0.2 [−0.3; −0.2] | 0.6 [0.5; 0.6] | 9.0 [6.9; 11.2] | 14.7 [14.1; 15.2] | 0.1 [0.1; 0.2] | 0.2 [0.1; 0.4] | 6.0 [4.5; 6.9] | 18.3 [16.8; 20.0] | −0.2 [−0.3; −0.1] | 0.5 [0.4; 0.6] |
| S. tetras | – | – | – | – | 0.2 [0.1; 0.3] | – | −0.9 [−0.9; −0.9] | −1 | – | – | – | – |
| T. minimum | 0.3 [0.2; 0.4] | – | −0.9 [−0.9; −0.9] | −1 | 13.5 [12.0; 15.3] | – | 0.5 [0.4; 0.5] | −1 | 0.8 [0.5; 1.3] | – | −0.7 [−0.8; −0.6] | −1 |
| Phytoplankton | Jun-GC | Jun-FP | Jun-E | Jun-A | Jul-GC | Jul-FP | Jul-E | Jul-A | Aug-GC | Aug-FP | Aug-E | Aug-A |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| T. obliquus | 5.3 [5.0; 5.5] | 9.3 [8.6; 10.1] | 0.1 [0; 0.1] | 0.3 [0.2; 0.3] | 5.5 [2.9; 9.7] | 10.0 [9.7; 10.3] | 0.2 [0; 0.4] | 0.5 [0.4; 0.6] | – | – | – | – |
| S. tetracerum | 0.1 [0; 0.2] | – | −1 [−1; −0.9] | −1 | 0.1 [0; 0.2] | – | −1 [−1; −0.9] | −1 | 0.2 [0.1; 0.3] | – | −1 [−0.9; −1] | −1 |
| Dinobrion sp. | 0.5 [0.3; 0.6] | – | −0.9 [−1; −0.8] | −1 | – | – | – | – | 0.1 [0.1; 0.2] | – | −1 | −1 |
| A. ovalis | 15.8 [14.4; 18.0] | 18.7 [17.3; 20.2] | 0.4 [0.4; 0.4] | 0.1 [0; 0.1] | 7.5 [7.1; 7.9] | 15.4 [14.6; 16.0] | 0.2 [0.2; 0.2] | 0.3 [0.3; 0.4] | 16.3 [16.1; 16.5] | 16.9 [15.7; 18.2] | 0.4 [0.4; 0.4] | 0 [0; 0.1] |
| F. acus | 5.8 [4.1; 8.3] | – | 0.2 [0.1; 0.3] | −1 | 0.1 [0; 0.2] | – | −0.9 [−1; −0.9] | −1 | 1.7 [0.5; 2.8] | – | −0.5 [−0.7; −0.2] | −1 |
| G. acuminatum | – | – | – | – | 6.0 [5.1; 7.2] | – | 0.4 [0.3; 0.5] | –1 | 8.7 [7.1; 11.4] | – | 0.7 [0.7; 0.7] | −1 |
| G. constrictum | – | – | – | – | 5.9 [3.6; 7.2] | 14.8 [14.3; 15.4] | 0.1 [0.1; 0.2] | 0.4 [0.3; 0.6] | 6.0 [3.6; 7.1] | 15.4 [14.8; 16.2] | 0.1 [0.1; 0.1] | 0.5 [0.4; 0.6] |
| N. cryptocephala | – | – | – | – | 0.1 [0.1; 0.1] | – | −0.9 [−1; −0.9] | −1 | – | – | – | – |
| R. abbreviata | 7.0 [6.2; 8.5] | – | 0 [−0.1; 0] | −1 | 6.3 [2.5; 12.4] | – | −0.3 [−0.4; −0.2] | −1 | 5.3 [3.9; 6.7] | – | −0.2 [−0.4; −0.1] | −1 |
| U. ulna | – | – | – | – | – | – | – | – | 0.7 [0.5; 0.8] | 20.6 [19.1; 22.8] | −0.7 [−0.8; −0.7] | 0.9 [0.9; 0.9] |
| Euglena sp. | 6.1 [5.4; 6.6] | 20.3 [18.8; 22.1] | −0.2 [−0.3; −0.2] | 0.5 [0.5; 0.6] | 4.5 [1.5; 8.5] | 19.5 [18.2; 20.8] | −0.5 [−0.7; −0.4] | 0.6 [0.4; 0.9] | 10.4 [7.8; 13.1] | 16.9 [15.7; 18.3] | 0.1 [0; 0.1] | 0.3 [0.2; 0.4] |
| T. volvocina | – | – | – | – | 3.5 [3.2; 3.7] | – | −0.3 [−0.3; −0.2] | −1 | 3.8 [0.8; 5.7] | – | −0.4 [−0.8; −0.2] | −1 |
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