生物操纵对常见底栖丝状绿藻的控制研究OA北大核心CSTPCD

In this study,we explored the potential for aquatic animals to control the growth of ben-thic filamentous green algae using biomanipulation,aiming to provide a safe and efficient solution for controlling overgrowth of filamentous green algae in aquatic ecosystems and for addressing algal blooms.Radix auricularia(snail),Rhinogobius giurinus(fish),Rhodeus sinensis(fish)and Macrobra-chium nipponense(prawn)were selected as test aquatic animals,and control experiments were con-ducted in two phases:Phase Ⅰ,experiments using R.auricularia,R.giurinus,R.sinensis,and M.nip-ponense to control a benthic filamentous green algae(Spirogyra sp.);Phase Ⅱ,experiments using R.sinensis to control three species of benthic filamentous green algae(Spirogyra sp.,Hydrodictyon reticulatum,and Cladophora sp.).All treatments during both phases included a control group and were run in triplicate.Physical and chemical parameters of the water body,and periphytic algae and plankton biomass during the experiments were determined.The biomass of attached Spirogyra sp.in Phase Ⅰ was initially 90 g/m2 and decreased to a final biomass of 34 g/m2 after treatment with R.si-nensis,significantly lower than the control or other biological treatment groups.R.sinensis exhibited significant control on both planktonic and attached Spirogyra sp.(P＜0.01).In Phase Ⅱ,the biomass of attached Spirogyra sp.was significantly lower than in the control group,while the biomass of at-tached Hydrodictyon reticulatum and Cladophora sp.decreased,but non-significantly,compared to the control group.The biomass reductions of attached Spirogyra sp.,Hydrodictyon reticulatum and Cladophora sp.by R.sinensis were 98.27％,12.45％and 67.91％,respectively.These results indicate that R.sinensis clearly exerts biological control on benthic filamentous green algae,but displays a preference for Spirogyra sp..In conclusion,R.sinensis significantly reduced the biomass of benthic filamentous green algae,with no observed impacts on other phytoplankton and zooplankton,demon-strating the great potential of R.sinensis for biological control of filamentous algae.