冯友飞, 翁福添, 马园庭, 等, xxxx. 南海北部夏季浮游植物群落对中尺度涡物理过程的响应[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230306002.
引用本文: 冯友飞, 翁福添, 马园庭, 等, xxxx. 南海北部夏季浮游植物群落对中尺度涡物理过程的响应[J]. 海洋科学进展, x(x): xx-xx. doi: 10.12362/j.issn.1671-6647.20230306002.
FENG Y F, WENG F T, MA Y T, et al, xxxx. Response of phytoplankton communities to mesoscale eddy physical processes in the northern South China Sea in summer[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230306002
Citation: FENG Y F, WENG F T, MA Y T, et al, xxxx. Response of phytoplankton communities to mesoscale eddy physical processes in the northern South China Sea in summer[J]. Advances in Marine Science, x(x): xx-xx. DOI: 10.12362/j.issn.1671-6647.20230306002

南海北部夏季浮游植物群落对中尺度涡物理过程的响应

Response of Phytoplankton Communities to Mesoscale Eddy Physical Processes in the Northern South China Sea in Summer

  • 摘要: 为了分析南海北部浮游植物群落对中尺度暖涡的响应,于2021年夏季在南海北部海域布设了19个大面站,采集浮游植物水样,并分析浮游植物丰度、群落特征指数,以及水体叶绿素极大值层和营养盐浓度分布等,结果表明:共鉴定出隶属于3门82属的307种浮游植物,其中甲藻和硅藻为该海域主要的浮游植物类群,分别有176种(33属)和129种(48属),优势种为菱形海线藻(Thalassionema nitzschioides)、菱形藻属(Nitzschia spp.)、环沟藻属(Gyrodinium spp.)、斯克里普藻属(Scrippsiella spp.);在中尺度暖涡中心,叶绿素极大值层(Deep Chlorophyll Maximum, DCM)相比边缘区域更深,营养盐浓度分布也呈现类似特点;中尺度涡的物理过程对浮游植物群落结构产生显著影响,表现为暖涡中心区域的浮游植物丰度低于边缘区域。广义可加模型(Generalized Additive Models, GAM)分析表明,在暖涡中心区域,随着温度升高,硅藻丰度开始降低,且硅藻在中心区域的丰度低于边缘区域;相比之下,甲藻在中心区域的丰度高于边缘区域。 进一步分析硅藻优势种菱形海线藻(Thalassionema nitzschioides)、菱形藻属(Nitzschia spp.)和甲藻优势种环沟藻属(Gyrodinium spp.)、斯克里普藻属(Scrippsiella spp.)的分布特征可知,硅藻在暖涡中心区域的丰度小于边缘区域,甲藻则相反。通过对暖涡区域群落特征指数的分析发现,从边缘区域到中心区域,物种多样性显著降低,物种分布趋于均匀。本研究可为探索浮游植物对中尺度涡响应提供基础资料。

     

    Abstract: This study aims to analyze the response of phytoplankton communities in the northern South China Sea to mesoscale warm eddies. In the summer of 2021, 19 large-scale stations were set up in the sea area to collect phytoplankton water samples, and a series of analyses were conducted on the abundance, diversity index, evenness index, etc. of phytoplankton in the northern South China Sea during summer. A total of 307 species of phytoplankton were identified, belonging to 3 phyla and 82 genera. The results show that dinoflagellates and diatoms are the main phytoplankton groups in this area, with 176 and 129 species respectively; In the center of the mesoscale warm eddy, the chlorophyll maximum layer is deeper than that in the edge region, and the nutrient concentration distribution shows similar characteristics; The physical processes of mesoscale eddy have a significant effect on phytoplankton community structure, and the abundance of phytoplankton in the central region of the warm eddy is lower than that in the marginal region. GAM analysis showed that in the central region of the warm eddy, the diatom cell abundance began to decrease with the increase of temperature, which was related to the lower silicate concentration in the central region, resulting in the diatom cell abundance in the central region being lower than that in the marginal region. In contrast, dinoflagellates have a higher cell abundance in the central region than in the marginal region. The dominant species of diatom such as Thalassionema nitzschioides and Nitzschia spp., and the dominant species of dinoflagellates such as Gyrodinium spp. and Scrippsiella spp. further showed that the abundance of diatom in the central region of the warm eddy was smaller than that in the marginal region, while the cell abundance of dinoflagellate in the central region of the warm eddy was greater than that in the marginal region. Through the analysis of community characteristic index of warm eddy region, it was found that species diversity decreased significantly from marginal region to central region, and species distribution tended to be uniform. This study provides basic data for future exploration of phytoplankton response to mesoscale eddy.

     

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