生物操纵对常见底栖丝状绿藻的控制研究

为探究安全高效调控丝状绿藻生长的解决方法，本研究开展了两次生物操纵实验。首先研究了耳萝卜螺（Radix auricularia）、子陵吻鰕虎鱼子陵吻虾虎鱼（Rhinogobius giurinus）、中华鳑鲏（Rhodeus sinensis）和日本沼虾（Macrobrachium nipponense）对底栖丝状绿藻—水绵（Spirogyra sp.）的控制效果，结果表明，中华鳑鲏处理组的固着态水绵生物量从实验前期的90g/m2下降到实验末期的34 g/m2，相对于其它生物操纵对象，中华鳑鲏对浮游态和固着态水绵抑制效果尤为显著。进而，我们深入探讨了中华鳑鲏对多种底栖丝状绿藻，包括水绵、水网藻（Hydrodictyon reticulatum）、刚毛藻（Cladophora sp.）生长的抑制效果。结果表明，鳑鲏处理组中，固着态水绵生物量（146 mg/m2）显著低于对照组（8423mg/m2），固着态水网藻生物量（49mg/m2）略低于对照组（56mg/m2），固着态刚毛藻生物量（486mg/m2）也低于对照组（1516mg/m2），结果进一步表明支持中华鳑鲏对水绵、水网藻、刚毛藻均存在一定的抑制效果，其中对水绵抑制效果具有显著性。中华鳑鲏在抑制底栖丝状绿藻生长的同时对水体中浮游植物和浮游动物造成的影响并不显著，表明作为控制丝状绿藻的潜在生物操纵对象具有很好的应用前景。

The control of benthic filamentous green algae by biological manipulation

In order to explore the regulated solution of filamentous green algae with safe and efficient method , two biological manipulation experiments were carried out in our study. Firstly, the control effect of Radix auricularia, Rhinogobius giurinus, Rhodeus sinensis and Macrobrachium nipponense for the benthic filamentous green algae-Spirogyra was observed, and the results showed that the periphytic Spirogyra biomass of the Rhodeus sinensis group decreased from 90 g/m2 in the early stage of the experiment to 34 g/m2 at the end of the experiment. The inhibition effect of Rhodeus sinensis on the phytoplanktic and periphytic Spirogyra was particularly significant comparing to other biological manipulation animals. Furthermore, we deeply discussed the inhibition effect of Rhodeus sinensis on the Spirogyra, Hydrodictyon reticulatum, and Cladophora. The results showed that in the Rhodeus sinensis group, the periphytic Spirogyra biomass (146 mg/m2) was significantly lower than that in the control group (8423 mg/m2), the periphytic Hydrodictyon reticulatum biomass (49 mg/m2) was slightly lower than that in the control group (56 mg/m2), and the periphytic Cladophora sp. biomass (486 mg/m2) was also lower than that in the control group (1516 mg/m2).The results further showed that the Rhodeus sinensis had a obvious inhibition effect on all the three filamentous green algae, among which the inhibition effect on Spirogyra was significant. While inhibiting the growth of benthic filamentous green algae, the Rhodeus sinensis had insignificant effects on both of the phytoplankton and zooplankton. Our results showed that Rhodeus sinensis as a potential biological manipulation animal would have good prospect of application.