| ZENG Yang,HUANG Xuguang,HUANG Bangqin,MI Tiezhu. 2016. Relationship between bacteria and phytoplankton during the giant jellyfish Nemopilema nomurai bloom in an oligotrophic temperate marine ecosystem. Acta Oceanologica Sinica, 35(10):107－113 |
| Relationship between bacteria and phytoplankton during the giant jellyfish Nemopilema nomurai bloom in an oligotrophic temperate marine ecosystem |
| 大型水母沙海蜇暴发的温带贫营养海洋生态系统中细菌和浮游植物的关系 |
| Received:September 22, 2015 Revised:December 24, 2015 |
| DOI：10.1007/s13131-016-0894-x |
| Key words:jellyfish bloom Nemopilema nomurai phytoplankton pigments jellyfish DOM ecological consequence |
| 中文关键词: 水母暴发 沙海蜇 浮游植物 光合色素 水母溶解有机物 生态影响 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | ZENG Yang | Key Laboratory of Coastal and Wetland Ecosystems of Ministry of Education, Xiamen University, Xiamen 361005, China
Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | | | HUANG Xuguang | Key Laboratory of Coastal and Wetland Ecosystems of Ministry of Education, Xiamen University, Xiamen 361005, China
Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | | | HUANG Bangqin | Key Laboratory of Coastal and Wetland Ecosystems of Ministry of Education, Xiamen University, Xiamen 361005, China
Fujian Provincial Key Laboratory of Coastal Ecology and Environmental Studies, Xiamen University, Xiamen 361005, China | bqhuang@xmu.edu.cn | | MI Tiezhu | College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, China | |
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| Abstract: |
| Bacterial abundance, phytoplankton community structure and environmental parameters were investigated to study the relationships between bacteria and phytoplankton during giant jellyfish Nemopilema nomurai blooms in the central Yellow Sea during 2013. N. nomurai appeared in June, increased in August, reached a peak and began to degrade in September 2013. Results showed that phosphate was possible a key nutrient for both phytoplankton and bacteria in June, but it changed to nitrate in August and September. Phytoplankton composition significantly changed that pico-phytoplankton relative biomass significantly increased, whereas other size phytoplankton significantly decreased during jellyfish bloom. In June, a significantly positive correlation was observed between chlorophyll a concentration and bacterial abundance (r=0.67, P<0.001, n=34). During jellyfish outbreak in August, there was no significant correlation between phytoplankton and bacteria (r=0.11, P>0.05, n=25), but the relationship (r=0.71, P<0.001, n=31) was rebuilt with jellyfish degradation in September. In August, small size phytoplankton occupied the mixed layer in offshore stations, while bacteria almost distributed evenly in vertical. chlorophyll a concentration significantly increased from (0.42±0.056) μg/L in June to (0.74±0.174) μg/L in August, while bacterial abundance just slightly increased. Additionally, the negative net community production indicated that community respiration was not entirely determined by the local primary productivity in August. These results indicated that jellyfish blooms potentially affect coupling of phytoplankton and bacteria in marine ecosystems. |
| 中文摘要: |
| 本文旨在研究2013年黄海中部大型水母沙海蜇暴发区的细菌与浮游植物的相互关系。2013年6月沙海蜇在黄海中部开始出现，8月水母生物量逐渐增多，9月达到峰值并开始消亡。通过对细菌丰度、浮游植物群落结构及其它环境参数研究分析，结果表明：浮游植物和细菌生长的可能关键营养元素从6月的磷酸盐转变为8月和9月的硝酸盐。水母暴发时，浮游植物群落组成出现明显的变化，微微型浮游植物显著增加，其它粒径的浮游植物显著下降。6月，叶绿素a的浓度与细菌丰度呈显著正相关关系（r=0.67，P<0.001，n=34）；而在水母暴发的8月，浮游植物和细菌的相关关系并不显著（r=0.11，P>0.05，n=25）；9月，随着水母的消亡，浮游植物和细菌又重新呈显著正相关关系（r=0.11，P>0.05，n=25）。8月，小粒径的浮游植物在离岸站位的混合层占主导地位，而细菌在垂直方向上基本呈均匀分布。叶绿素a浓度从6月（0.42±0.056）μg/L升高到8月（0.74±0.174）μg/L，而细菌丰度仅有轻微上升。此外，8月负的净群落生产力表明群落呼吸不完全由本地的初级生产力支撑。由此可见，在海洋生态系统中，水母暴发可能影响浮游植物和细菌之间的相互关系。 |
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