| 摘要: |
| 牡蛎的滤食作用不但能控制浮游植物丰度，还能通过摄食选择性影响群落结构。通过在较高营养水体的围隔实验表明，牡蛎养殖在持续磷限制条件下，促使浮游植物群落由甲藻向小型硅藻优势转变。实验结束时对照组中浮游植物群落由扁压原甲藻主导，占总丰度的77%；而牡蛎养殖组新月柱鞘藻丰度占比达到93%。牡蛎养殖组中，甲藻去除速率随养殖密度增长，但是硅藻最终丰度在高密度牡蛎组最高。研究结果说明大量的贝类养殖能够提升小型链状硅藻的优势度，增加此类赤潮发生风险。 |
| 关键词: 牡蛎养殖 浮游植物 硅甲藻比 围隔实验 |
| DOI：10.11759/hykx20200408002 |
| 分类号:P76 |
| 基金项目:中国科学院战略性先导科技专项（XDA23050401）；中国科学院科技服务网络计划（Y82346101L）；国家重点基础研究发展计划（973）项目（2015CB452903） |
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| Top-down impacts of Crassostrea gigas on the phytoplankton community: Mesocosm experiments in a eutrophic pond |
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WANG Zhao-hui1,2,3, ZHANG Guang-tao1,3
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1.Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2.University of Chinese Academy of Sciences, Beijing 100049, China;3.Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266237, China
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| Abstract: |
| In addition to phytoplankton biomass removal, oyster feeding may also impact the community composition. In our mesocosm experiments, under the continuous phosphorus restriction conditions, oyster feeding promoted a shift in phytoplankton community structure away from dinoflagellates toward the dominance of small diatoms. At the end of cultivation, Prorocentrum compressum prevailed in control treatments, accounting for 77% of the total abundance, whereas Cylindrotheca closterium reached 93% at all oyster densities. In oyster cultivation treatments, while dinoflagellate abundance decreased with oyster density in the initial days, the final diatom abundance was the highest in the high-oyster density treatment. The results indicated that dense bivalve farming can potentially increase the risk of red tide formation by small and chain-forming diatom species. |
| Key words: oyster cultivation phytoplankton diatom/dinoflagellate ratio enclosure experiment |
