海洋科学2016，Vol.40Issue(7)：33-40,8.DOI:10.11759/hykx20151207002
桂山岛海域甲藻孢囊的分布与浮游植物休眠体萌发研究
Distribution of dinocysts and the germination of phytoplank-ton resting spores in surface sediments from the Guishan Is-land sea area in the Pearl River Estuary of the South China Sea
摘要
Abstract
In order to understand the distribution of dinocysts and the potential of harmful algal blooms (HABs) found in the Guishan Island sea area in the Pearl River Estuary, dinocysts were analyzed in surface sediment sam-ples, collected in January 2009. The surface sediments were incubated for 20, and 40 days, and germinated vegeta-tive cells were examined; a total of 21 types of dinocysts were observed, withProtoperidinium species cysts found to be the most abundant and diversified. The average concentration of germinated phytoplankton was 490, and 264 cells/g, respectively, after 20 and 40 days incubation. Cyst concentrations were low, ranging from 110 to 315 cysts/g, with an average of 202 cysts·g–1, while higher concentrations of cysts were found in stations located in aquaculture areas. The proportions of cysts from heterotrophic dinoflagellates were higher, indicating a high nutrient level in this sea area. Furthermore, proportions of living cysts averaged 61.75%, indicating the high potential for HABs. The species diversity of germinated phytoplankton recorded was low, and altogether 22 taxa within 19 genuses were ob-served. Interestingly, a woloszynskioid species,Biecheleriopsis adriatica, was predominant in the germinated dinoflagellates analyzed, withScrippsiella trochoideafound to be the next dominant dinoflagellate. In the germinated phytoplankton samples,Skeletonema costatum,Chaetoceros curvisetus,andNavicula sp. were the dominant diatoms. The results from this study suggest the high risk of HABs in the Guishan Island sea area, as indicated by the wide distribution of cysts of HAB species, and the massive germination of potential HAB species.关键词
甲藻孢囊/浮游植物休眠体/萌发/桂山岛海域/珠江口Key words
dinocyst/resting spore/germination/Guishan Island sea area/the Pearl River Estuary引用本文复制引用
康伟,王朝晖..桂山岛海域甲藻孢囊的分布与浮游植物休眠体萌发研究[J].海洋科学,2016,40(7):33-40,8.基金项目
国家自然科学基金项目(41476132) （41476132）
水体富营养化与赤潮防治广东普通高校重点实验室(暨南大学)开放课题@@@@National Natural Science Foundation of China, No.41476132 （暨南大学）
Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, KLB07007 （）
