凡纳滨对虾-缢蛏生态循环养殖池塘中浮游植物群落结构与水质因子相关性研究

为研究凡纳滨对虾(Litoperaaeus vannamei)与缢蛏(Siaoraovacula constricta)生态循环养殖过程中浮游植物群落结构及其与水质因子变化特征之间的相关性,本实验于2018年6月至11月在宁波市鄞州区椿霖养殖场对虾蛏循环养殖池塘中水质及浮游植物的动态开展了逐月采样监测,分析了养虾塘与养蛏塘中的浮游植物群落结构变化及水质因子变动。结果显示:(1)对虾养殖期间共鉴定出6个门101种浮游植物(包含9个未定种),从种的数量上来看,硅藻门>甲藻门>绿藻门>蓝藻门>裸藻门>隐藻门,其中包含优势种14种,养殖初期优势种为硅藻门的新月菱形藻(Nitzschia closteriu)、牟氏角毛藻(Chaetoceros muelleri)等,随后甲藻门的海洋原甲藻(Prorocentrum micans)和绿藻门的小球藻(Chlorella vulgaris)等逐渐占据优势,后期仍以硅藻门为主要优势种。(2)浮游植物的丰度介于6.8×10⁵-2.5×10⁸cell/L,生物量为2.04-65.72...

RELATIONSHIP BETWEEN PHYTOPLANKTON STRUCTURE AND WATER QUALITY FACTORS IN CULTURE PONDS OF LITOPENAEUS VANNAMEI AND SINONOVACULA CONSTRICTA

To understand the relationships between water quality and phytoplankton community structure in ecological recycling culture of Litopenaeus vannamei and Sinonovacula constricta, the water quality was tested and the changes of phytoplankton community structure were analyzed from June 2018 to November 2018 in an aquaculture farm in Yinzhou District, Ningbo, and then the relationships between phytoplankton community structure and water quality factors were analyzed. Results show that 6 phyla and 101 species (including 9 unnamed species) were identified, i.e., in descendent order in the number of species:Bacillariophyta > Pyrrophyta > Chlorophyta > Euglenophyta > Cyanophyta > Chrysophyta > Xanthophyta. Among them, 14 species (including 1 unnamed species) were dominant species, the dominant species was Bacillariophyta in the early stage of culture, and then the dominant species were Dinoflagella and Chlorophyta, and finally diatom was still the main Bacillariophyta species. The density of zooplankton ranged from 6.8×10⁵-2.5×10⁸ cell/L, the biomass was 2.04-65.72mg/L, the Shannon-Wiener diversity index was 1.34-2.56, the evenness index was 0.43-0.72, indicating high diversity level and even species distribution. As shown in CCA analysis, the species of Bacillariophyta were mainly affected by temperature, salinity, and pH; the species of Chlorophyta were mainly affected by nitrogen content (including total nitrogen, ammonia nitrogen, nitrous nitrogen); and the species of Pyrrophyta and Cyanophyta were mainly affected by phosphorus content (including total phosphorus, active phosphorus) and temperature.