| SUN Dong,ZHANG Dongsheng,ZHANG Ruiyan,WANG Chunsheng. 2019. Different vertical distribution of zooplankton community between North Pacific Subtropical Gyre and Western Pacific Warm Pool: its implication to carbon flux. Acta Oceanologica Sinica, 38(6):32－45 |
| Different vertical distribution of zooplankton community between North Pacific Subtropical Gyre and Western Pacific Warm Pool: its implication to carbon flux |
| 北太平洋亚热带环流区与西太平洋暖池区浮游动物群落垂直分布的差异及其对碳通量的意义 |
| Received:September 17, 2017 |
| DOI：10.1007/s13131-018-1237-x |
| Key words:mesopelagic zone diel vertical migration biological pump vertical distribution active carbon flux |
| 中文关键词: 海洋中层 昼夜垂直迁移 生物泵 垂直分布 主动碳通量 |
| 基金项目:The National Basic Research Program (973 Program) of China under contract No. 2015CB755902; the China Ocean Mineral Resources Research and Development Association Program under contract No. DY135-E2-2-4; the Scientific Research Fund of the Second Institute of Oceanography, SOA under contract No. JG1712; the National Natural Science Foundation of China under contract No. 41406116. |
| Author Name | Affiliation | E-mail | | SUN Dong | Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | ZHANG Dongsheng | Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | ZHANG Ruiyan | Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | | | WANG Chunsheng | Key Laboratory of Marine Ecosystem and Biogeochemistry, State Oceanic Administration, Hangzhou 310012, China
Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China | wangsio@sio.org.cn |
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| Abstract: |
| The mesozooplankton in both epipelagic and mesopelagic zones is essentially important for the study of ecosystem and biological carbon pump. Previous studies showed that the diel vertical migration (DVM) pattern of mesozooplankton varied among ecosystems. However, that pattern was largely unknown in the Western Pacific Warm Pool (WPWP). The vertical distribution, DVM and community structure of mesozooplankton from the surface to 1 000 m were compared at Stas JL7K (WPWP) and MA (North Pacific Subtropical Gyre, NPSG). Two sites showed similarly low biomass in both epipelagic and mesopelagic zones, which were in accordance with oligotrophic conditions of these two ecosystems. Stronger DVM (night/day ratio) was found at JL7K (1.31) than that at MA (1.09) on surface 0-100 m, and an obvious night increase of mesopelagic biomass was observed at JL7K, which was probably due to migrators from bathypelagic zone. Active carbon flux by DVM of zooplankton was estimated to be 0.23 mmol/(m2·d) at JL7K and 0.16 mmol/(m2·d) at MA. The community structure analysis showed that calanoid copepods, cnidarians and appendicularians were the main contributors to DVM of mesozooplankton at both sites. We also compared the present result with previous studies of the two ecosystems, and suggested that the DVM of mesozooplankton was more homogeneous within the WPWP and more variable within the NPSG, though both ecosystems showed typically extremely oligotrophic conditions. The different diel vertical migration strength of mesozooplankton between NPSG and WPWP implied different efficiency of carbon pump in these two ecosystems. |
| 中文摘要: |
| 海洋上层与中层的中型浮游动物对于海洋生态系统与生物泵研究均有着重要的意义。前人的研究表明在不同海洋生态系统中浮游动物的昼夜垂直迁移（DVM）模式存在差异。但是，迄今为止对于西太平洋暖池区浮游动物DVM的研究仍很缺乏。本研究对两个分别位于北太平洋亚热带环流区（MA站）和西太平洋暖池区（JL7K站）的调查站位展开了系统采样调查，研究了这两个站位0-1000m水层浮游动物的垂直分布、DVM和群落结构等生态特征。研究结果表明，这两个站位具有相似的生物量垂直分布模式，这也与两个海域的寡营养状态一致。在0-100m的海洋表层，JL7K站位的DVM强度（夜间/昼间的生物量比值为1.31）要高于MA站位（前述比值为1.09）。此外，在海洋中层（200-1000m），JL7K站位浮游动物生物量在夜间存在明显的升高现象，这一现象可能是由更深处的浮游动物在夜间往浅层的迁移所导致。在JL7K和MA站位，由浮游动物DVM导致的主动碳通量分别约为0.23 mmol C m-2 day-1和0.16 mmol C m-2 day-1。对浮游动物群落结构的分析表明哲水蚤、刺胞动物和被囊类为主要的DVM类群。综合前人的研究和本研究的结果，我们发现尽管西太平洋暖池区和北太平洋亚热带环流区都属于典型的寡营养海区，但是浮游动物的DVM强度在前一区域内的空间差异不大，而在后一个区域则存在明显的空间差异。这种浮游动物群落DVM强度的差异则进一步暗示了两个生态系统的生物泵效率存在差别。 |
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