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Table 3
Biomass density of phytoplankton before (pre-exposure) and 24 h after collocation (post-exposure) of active polypides.
| μg L−1 | June pre-exposure | June post-exposure | July pre-exposure | July post-exposure | August pre-exposure | August post-exposure |
|---|---|---|---|---|---|---|
| Ultraplankton | 600.0 ± 147.3*a | 180.3 ± 60.9* | 284.3 ± 98.1b | 150.0 ± 29.0 | 200.0 ± 36.1b | 50.0 ± 4.6 |
| Raphidiopsis curvata F.E. Fritsch and M.F. Rich | 29.3 ± 3.8*a | 14.7 ± 3.9* | 14.3 ± 3.8b | 7.3 ± 3.5 | 21.1 ± 3.4*ab | 9.7 ± 2.5* |
| Total Cyanophyceae | – | |||||
| Ankistrodesmus falcatus (Corda) Ralfs | 4.3 ± 0.4* | 1.7 ± 0.4* | 3.3 ± 1.3 | 2.1 ± 0.6 | – | – |
| Ankistrodesmus spiralis (W.B. Turner) Lemmermann | – | – | 4.8 ± 0.9 | 4.0 ± 0.5 | – | – |
| Coelastrum microporum Nägeli | – | – | – | – | 4.8 ± 0.7 | 3.5 ± 0.9 |
| Crucigenia quadrata Morren | 4.5 ± 1.2* | 1.1 ± 0.2* | – | – | 3.4 ± 0.8 | 3.0 ± 1.0 |
| Kirchneriella obesa (West) West & G. S. West | 12.1 ± 2.5* | 3.0 ± 1.0* | 13.7 ± 4.4* | 6.9 ± 1.0* | – | – |
| Pediastrum duplex Meyen | 1140.0 ± 119.8 | 1107.2 ± 111.0 | 1354.0 ± 209.5 | 1328.7 ± 188.4 | – | – |
| Scenedesmus ecornis (Ehrenberg) Chodat | 64.1 ± 9.7*b | 33.9 ± 6.7* | 90.6 ± 5.9*a | 45.6 ± 7.1* | – | – |
| Scenedesmus ellipsoideus Chodat | 16.2 ± 2.0*a | 8.0 ± 1.1* | 10.0 ± 1.0b | 6.7 ± 1.8 | 16.2 ± 2.1*a | 4.0 ± 1.0* |
| Scenedesmus quadricauda (Turpin) Brébisson | 7.0 ± 0.4b | 6.4 ± 0.7 | 14.1 ± 1.8*a | 7.0 ± 1.3* | 19.4 ± 4.1*a | 12.3 ± 1.6* |
| Selenastrum bibraianum Reinsch | 609.3 ± 135.2a | 304.0 ± 50.5 | 1599.0 ± 259.4*b | 558.8 ± 39.7* | 914.0 ± 136.5*a | 457.0 ± 91.5* |
| Stauridium tetras (Ehrenberg) E. Hegewald | – | – | 190.4 ± 21.9 | 186.0 ± 22.0 | – | – |
| Tetraedron minimum (A.Braun) Hansgirg | 74.7 ± 8.2 | 71.3 ± 7.1 | 89.2 ± 24.9* | 18.6 ± 5.5* | 76.6 ± 7.6 | 71.0 ± 9.8 |
| Tetradesmus obliquus (Turpin) M. J. Wynne | 28.3 ± 1.9b | 14.2 ± 1.1 | 46.5 ± 11.8*a | 24.3 ± 3.9* | – | – |
| Total Chlorophyceae | 1960.6 ± 177.8b | 1550.8 ± 191.2 | 3392.0 ± 254.0*a | 2190.3 ± 209.1* | 1035.5± 132.4c | 550.9 ± 85.7 |
| Staurastrum tetracerum Ralfs ex Ralfs | 114.0 ± 18.3b | 112.7 ± 19.1 | 172.7 ± 17.0a | 171.0 ± 18.4 | 116.0 ± 14.7b | 114.0 ± 15.1 |
| Total Coniugatophyceae | – | |||||
| Dinobrion sp. | 93.5 ± 16.3b | 90.1 ± 17.9 | – | – | 248.7 ± 37.0a | 245.4 ± 37.7 |
| Total Chrysophyceae | – | |||||
| Amphora ovalis (Kützing) Kützing | 240.4 ± 50.9* | 30.0 ± 4.6* | 180.3 ± 17.5* | 75.1 ± 5.8* | 300.5 ± 44.9* | 45.3 ± 5.3* |
| Fragilaria acus (Kützing) Lange-Bertalot | 29.3 ± 5.7*a | 13.7 ± 0.4* | 14.8 ± 1.5b | 14.6 ± 1.3 | 21.9 ± 8.7ab | 14.7 ± 2.4 |
| Gomphonema acuminatum Ehrenberg | – | – | 8.5 ± 2.0* | 4.3 ± 1.0* | 2.8 ± 0.8 | – |
| Gomphonema constrictum Ehrenberg | – | – | 118.8 ± 17.4* | 59.4 ± 5.3* | 89.1 ± 13.1* | 44.5 ± 4.5* |
| Navicula cryptocephala Kützing | – | – | 12.5 ± 1.8 | 12.4 ± 1.8 | – | – |
| Rhoichosphenia abbreviata (C.Agardh) Lange-Bertalot | 237.5 ± 39.9b | 94.7 ± 9.0 | 296.9 ± 63.8ab | 148.4 ± 51.6 | 475.1 ±122.9a | 267.2 ± 107.9 |
| Ulnaria ulna (Nitzsch) Compère | – | – | – | – | 25.3 ± 1.5 | 23.5 ± 1.5 |
| Total Bacillariophyceae | 507.2 ± 95.8*b | 138.3 ± 13.4* | 631.8 ± 60.7*b | 314.2 ± 42.7* | 914.7 ± 93.0*a | 395.2 ± 99.0* |
| Euglena sp. | 1357.0 ± 179.4*b | 603.3 ± 99.0* | 1131.5 ± 305.3a | 664.5 ± 99.5* | 1508 ± 318.0*a | 452.6 ± 108.0* |
| Trachelomonas volvocina (Ehrenberg) Ehrenberg | – | – | 204.7 ± 47.4 | 136.5 ± 29.5 | 272.9 ± 92.1 | 169.6 ± 22.8 |
| Total Euglenophyceae | 1357.0 ± 179.4* | 603.3 ± 99.0* | 1336.2 ± 306.3* | 801.0 ± 116.0* | 1780.9 ± 310.3* | 622.2 ± 98.2* |
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