Liu Hua-Xue, Huang Hong-Hui, Xu Shan-Nan, Dai Ming, Shen Ping-Ping
Key Laboratory of South China Sea Fishery Resources Exploitation & Utilization, Ministry of Agriculture, South China Sea Fisheries Research Institute, Chinese Academy of Fisheries Sciences, Guangzhou, 510300, China.
Key Laboratory of Tropical Marine Bio-Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, China.
Ecotoxicology. 2015 Oct;24(7-8):1419-29. doi: 10.1007/s10646-015-1464-2. Epub 2015 May 13.
Planktonic community structure was investigated during outbreak of harmful Phaeocystis globosa bloom in a subtropical bay, the Maowei Sea, South China Sea. The phytoplankton assemblage was numerically dominated by colonial P. globosa, with its abundance ranging from 1.23 × 10(8) to 11.12 × 10(8) cells m(-3) and contributing nearly 90 % to the total abundance. Totally 66 mesozooplankton (>169 µm) and 19 ciliates species were recorded, with the densities ranged from 169 to 1633 ind m(-3) and 74 to 1118 cells L(-1), respectively. The dominant species for mesozooplankton were Copepoda (larvae), Bestiola sinicus, B. amoyensis, Macrura (larvae) and Acartia spinicauda, respectively. The ciliate assemblage was numerically dominated by Codonella rapa, Strombidium globosaneum and Mesodinium rubrum. During the bloom, P. globosa seemed to be negatively affected by the nutrient phosphate significantly (p < 0.05). However, no correlation between P. globosa and ciliate assemblage was detected, but P. globosa was negatively correlated with total biomass of mesozooplankton and abundance of B. sinicus (p < 0.05), suggesting that P. globosa was uncoupled from the grazing by both ciliates and mesozooplankton when appearing as colonies form. On the other hand, both positive and negative correlations among the dominant groups of mesozooplankton and ciliates were observed (p < 0.05) which possibly indicated that the predation of mesozooplankton upon ciliates might be strengthened during the Phaeocystis bloom and the complex effect also varied from species to species.
在南海北部湾一个亚热带海湾——茅尾海发生有害球形棕囊藻藻华期间，对浮游生物群落结构进行了调查。浮游植物组合在数量上以群居的球形棕囊藻为主，其丰度范围为1.23×10⁸至11.12×10⁸个细胞/立方米，占总丰度的近90%。共记录到66种中型浮游动物（>169微米）和19种纤毛虫，其密度分别为169至1633个个体/立方米和74至1118个细胞/升。中型浮游动物的优势种分别为桡足类（幼体）、中华哲水蚤、厦门哲水蚤、十足目（幼体）和刺尾纺锤水蚤。纤毛虫组合在数量上以萝卜形钟虫、球形中缢虫和红色中缢虫为主。在藻华期间，球形棕囊藻似乎受到营养盐磷酸盐的显著负面影响（p<0.05）。然而，未检测到球形棕囊藻与纤毛虫组合之间的相关性，但球形棕囊藻与中型浮游动物的总生物量和中华哲水蚤的丰度呈负相关（p<0.05），这表明当球形棕囊藻以群体形式出现时，它与纤毛虫和中型浮游动物的捕食作用解耦。另一方面，观察到中型浮游动物和纤毛虫的优势类群之间存在正相关和负相关（p<0.05），这可能表明在球形棕囊藻藻华期间，中型浮游动物对纤毛虫的捕食作用可能会增强，且这种复杂影响因物种而异。
