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Table 4
Grazing rate (Rgr) and clearance rate (CR) of P. geimermassardi of phytoplankton of the Colfiorito Marsh.
| Jun-Rgr | Jul-Rgr | Aug-Rgr | Jun-CR | Jul-CR | Aug-CR | |
|---|---|---|---|---|---|---|
| Ultraplankton | 51.0 ± 5.0 | 25.4 ± 11.8 | 57.4 ± 8.7 | 85.0 ± 8.4a | 42.4 ± 19.6b | 95.7 ± 14.4a |
| R. curvata | 29.4 ± 7.7 | 30.2 ± 10.7 | 33.1 ± 13.0 | 49.0 ± 12.8 | 50.4 ± 17.8 | 55.2 ± 21.7 |
| A. falcatus | 40.5 ± 12.6 | 16.5 ± 10.0 | – | 67.4 ± 20.9 | 27.5 ± 16.7 | – |
| A. spiralis | – | 7.1 ± 6.0 | – | – | 11.8 ± 10.0 | – |
| C. microporum | – | – | 13.4 ± 7.2 | – | – | 22.3 ± 12.0 |
| C. quadrata | 57.1 ± 16.7a | – | 5.8 ± 4.8b | 95.2 ± 27.8a | – | 9.7 ± 8.0b |
| K. obesa | 58.6 ± 18.8 | 27.3 ± 20.3 | – | 97.7 ± 31.3 | 45.5 ± 33.9 | – |
| P. duplex | 1.2 ± 0.2 | 0.7 ± 0.7 | – | 2.0 ± 0.4 | 1.2 ± 1.2 | – |
| S. ecornis | 26.8 ± 11.4 | 28.9 ± 4.8 | – | 44.6 ± 19.1 | 48.2 ± 7.9 | – |
| S. ellipsoideus | 29.2 ± 9.2ab | 17.8 ± 13.5b | 58.3 ± 12.6a | 48.6 ± 15.4ab | 29.7 ± 22.5b | 97.2 ± 21.0a |
| S. quadricauda | 4.2 ± 2.4 | 29.1 ± 12.9 | 18.4 ± 14.4 | 7.0 ± 3.9 | 48.4 ± 21.5 | 30.7 ± 24.0 |
| S. bibraianum | 28.6 ± 2.9 | 43.5 ± 9.5 | 29.2 ± 6.6 | 47.7 ± 4.9 | 72.5 ± 15.9 | 48.6 ± 10.9 |
| S. tetras | – | 1.0 ± 0.4 | – | – | 1.6 ± 0.6 | – |
| T. minimum | 1.9 ± 0.6b | 65.3 ± 7.3a | 3.9 ± 2.2b | 3.1 ± 1.0b | 108.9 ± 12.1a | 6.4 ± 3.7b |
| T. obliquus | 28.9 ± 2.7 | 26.6 ± 17.2 | – | 48.2 ± 4.5 | 44.4 ± 28.7 | – |
| S. tetracerum | 0.8 ± 0.7 | 0.4 ± 0.4 | 0.7 ± 0.4 | 1.3 ± 1.2 | 0.7 ± 0.7 | 1.2 ± 0.7 |
| Dinobrion sp. | 2.5 ± 0.6a | – | 0.6 ± 0.3b | 4.1 ± 1.0a | – | 0.9 ± 0.5b |
| A. ovalis | 86.4 ± 4.2a | 36.4 ± 1.1c | 78.7 ± 1.5b | 143.9 ± 7.0a | 60.7 ± 1.9c | 131.2 ± 2.6b |
| F. acus | 31.3 ± 8.7a | 0.6 ± 0.4c | 14.6 ± 12.7b | 52.2 ± 14.5a | 1.1 ± 0.7c | 24.4 ± 21.2b |
| G. acuminatum | – | 28.7 ± 5.2 | 42.2 ± 11.5 | – | 47.9 ± 8.6 | 70.3 ± 19.2 |
| G. constrictum | – | 28.7 ± 9.9 | 28.7 ± 9.5 | – | 47.8 ± 16.5 | 47.8 ± 15.8 |
| N. cryptocephala | – | 0.3 ± 0.13 | – | – | 0.6 ± 0.1 | – |
| R. abbreviata | 38.1 ± 3.1 | 30.3 ± 25.1 | 25.5 ± 6.9 | 63.4 ± 5.1 | 50.5 ± 41.8 | 42.5 ± 11.4 |
| U. ulna | – | – | 3.1 ± 0.5 | – | – | 5.2 ± 0.9 |
| Euglena sp. | 33.9 ± 7.0 | 21.5 ± 16.8 | 50.3 ± 13.3 | 56.5 ± 11.7 | 35.9 ± 28.0 | 83.9 ± 22.1 |
| T. volvocina | – | 16.8 ± 0.9 | 18.5 ± 13.0 | – | 28.0 ± 1.5 | 30.8 ± 21.6 |
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