Combining bivalve (Corbicula fluminea) and filter-feeding fish (Aristichthys nobilis) enhances the bioremediation effect of algae: An outdoor mesocosm study
Combining bivalve (Corbicula fluminea) and filter-feeding fish (Aristichthys nobilis) enhances the bioremediation effect of algae: An outdoor mesocosm study
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双壳类（Corbicula Fluminea）和滤食性鱼类（Aristichthys nobilis）的结合可增强藻类的生物修复效果：一项户外中生态研究
DOI：
10.1016/j.scitotenv.2020.138692
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发表时间：
2020
影响因子：
9.8
通讯作者：
Erik Jeppesen
中科院分区：
文献类型：
--
作者：
Ruijie Shen;Xiaohong Gu;Huihui Chen;Zhigang Mao;Qingfei Zeng;Erik Jeppesen
在室外围隔生态系统中，我们实验研究了结合两个本地滤食性，鳙鱼（Aristichthys nobilis）和亚洲蛤（河蚬），以控制滋扰蓝藻水华的效果。使用了四种处理-仅蛤、仅鱼、组合和对照。在组合中，鳙鱼（80 g m−3）和亚洲蛤（260 g m−2）对浮游植物生物量和改善水质具有显着的控制效果。实验结束时，联合组的叶绿素（Chla）浓度低于5 μg L− 1，而仅用蛤处理组为36 μg L − 1，对照组为31 μg L− 1，而仅用鱼处理组的Chlain则增加到211 μg L−1。大型藻类（Microcystissp.）在对照组和只养蛤组中以绿藻为主，而在只养鱼组中以小型藻类（Actinastrum hantzschii和Clamyeliumglobose）为主。总氮（TN）和总磷（TP）在水柱中的浓度显着降低蛤放养，无论鱼类的存在。通过24 h的实验室试验，验证了文蛤滤除小型藻类后的排泄物能否被鳙鱼摄食。实验结束时，有蛤围隔中的栅藻密度显著降低，鳙鱼的肠道充盈指数显著高于无蛤围隔时。我们的研究结果表明，在选定的实验条件和密度，水的透明度提高时，鳙鱼和亚洲蛤一起发生，而Chlacconcentrations和藻类生物量增加的鱼类只有围隔，在蛤只有围隔没有观察到显着的影响。我们认为，滤食性鱼类和蛤蜊的组合可以提高水的透明度，因此它可能是一个有用的恢复工具。
In outdoor mesocosms, we experimentally studied the effect of combining two native filter feeders, bighead carp (Aristichthys nobilis) and Asian clam (Corbicula fluminea), to control nuisance cyanobacterial blooms. Four treatments – clam-only, fish-only, combined and controls – were used. In combination, bighead carp (80 g m−3) and Asian clam (260 g m−2), had a remarkable controlling effect on phytoplankton biomass and improved water quality. By the end of the experiment, the chlorophylla(Chla) concentration of the combined group was below 5 μg L−1compared with 36 μg L−1in the clam-only treatments and 31 μg L−1in the controls, whereas Chlain the fish-only group had increased to 211 μg L−1. Large-sized algae (Microcystissp.) dominated in the control group and the clam-only group, whereas small-sized algae (Actinastrum hantzschiiandClamydomonas globose) dominated in the fish-only group. The concentrations of total nitrogen (TN) and total phosphorus (TP) in the water column were significantly reduced by clam stocking, regardless of the presence of fish. A 24-h laboratory experiment was conducted to verify whether the excrements produced by clams filtering small-sized algae could be eaten by bighead carp. At the end of the experiment, the density ofScenedesmusobliquushad decreased significantly in the clam-present mesocosms, and the gut fullness index of bighead carp was significantly higher in the clam-present mesocosms than when clams were absent. Our results show that, under the selected experimental conditions and densities, water clarity improved when bighead carp and Asian clam occurred together, whereas Chlaconcentrations and algae biomass increased in the fish-only mesocosms; in the clam-only mesocosms no significant effects were observed. We suggest that the combination of filter-feeding fish and clams may enhance water clarity and it may therefore potentially be a useful restoration tool.