| LIN Gengming,WANG Yanguo,CHEN Yanghang,YE Youyin,WANG Yu,YANG Qingliang. 2018. Regional disparities of phytoplankton in relation to environmental factors in the western Arctic Ocean during summer of 2010. Acta Oceanologica Sinica, 37(4):109－121 |
| Regional disparities of phytoplankton in relation to environmental factors in the western Arctic Ocean during summer of 2010 |
| 2010年西北冰洋浮游植物区域差异与环境关系 |
| Received:March 28, 2017 |
| DOI：10.1007/s13131-017-1129-5 |
| Key words:phytoplankton regional disparity species composition spatial distribution western Arctic Ocean |
| 中文关键词: |
| 基金项目:The Public Science and Technology Research Funds Projects of Ocean under contract No. 201305027; the National Natural Science Foundation of China under contract No. 41306204. |
| Author Name | Affiliation | E-mail | | LIN Gengming | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | lingengming@tio.org.cn | | WANG Yanguo | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | CHEN Yanghang | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | YE Youyin | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | WANG Yu | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | | | YANG Qingliang | Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China | |
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| Abstract: |
| Global warming has caused Arctic sea ice to rapidly retreat, which is affecting phytoplankton, the primary producers at the base of the food chain, as well as the entire ecosystem. However, few studies with large spatial scales related to the Arctic Basin at high latitude have been conducted. This study aimed to investigate the relationship between changes in phytoplankton community structure and ice conditions. Fifty surface and 41 vertically stratified water samples from the western Arctic Ocean (67.0°-88°26'N, 152°-178°54'W) were collected by the Chinese icebreaker R/V Xuelong from July 20 to August 30, 2010 during China's fourth Arctic expedition. Using these samples, the species composition, spatial distribution, and regional disparities of phytoplankton during different stages of ice melt were assessed. A total of 157 phytoplankton taxa (>5 μm) belonging to 69 genera were identified in the study area. The most abundant species were Navicula pelagica and Thalassiosira nordenskioeldii, accounting for 31.23% and 14.12% of the total phytoplankton abundance, respectively. The average abundance during the departure trip and the return trip were 797.07×102 cells/L and 84.94×102 cells/L, respectively. The highest abundance was observed at Sta. R09 in the north of Herald Shoal, where Navicula pelagica was the dominant species accounting for 59.42% of the abundance. The vertical distribution of phytoplankton abundance displayed regional differences, and the maximum abundances were confined to the lower layers of the euphotic zone near the layers of the halocline, thermocline, and nutricline. The species abundance of phytoplankton decreased from the low-latitude shelf to the high-latitude basin on both the departure and return trips. The phytoplankton community structure in the shallow continental shelf changed markedly during different stages of ice melt, and there was shift in dominant species from centric to pennate diatoms. Results of canonical correspondence analysis (CCA) showed that there were two distinct communities of phytoplankton in the western Arctic Ocean, and water temperature, ice coverage and silicate concentration were the most important environmental factors affecting phytoplankton distribution in the surveyed sea. These findings will help predict the responses of phytoplankton to the rapid melting of Arctic sea ice. |
| 中文摘要: |
| 全球变暖引起北极海冰快速退缩，影响食物链基础的初级生产者浮游植物以及整个生态系统。然而，涉及高纬度北极盆地的大尺度调查研究较少，本文研究该海域浮游植物群落结构变异与海冰的关系。根据2010年7月20日至8月30日中国第四次北极考察期间“雪龙”号科考船在西北冰洋（67.0°–88°26'N,152°–178°54'W）采集的50份表层和41份垂直分层浮游植物样品，分析不同融冰阶段浮游植物的种类组成、空间分布和区域差异。调查海区共鉴定69属157种浮游植物（>5 μm），最丰富种类为大洋舟形藻（Navicula pelagica）和诺登海链藻（Thalassiosira nordenskioeldii），分别占浮游植物总量的31.23%和14.12%。去程和返程浮游植物的平均丰度分别为797.07×102 cells/L和84.94×102 cells/L，密集中心位于赫雷德浅滩北部的R09测站，最主要优势种Navicula pelagica占该测站丰度的59.42%。浮游植物的垂直分布呈现区域差异，丰度最大值出现于盐跃层、温跃层或营养盐跃层附近的透光层。不管去程还是返程，浮游植物的种类丰富度均呈现从低纬度的陆架区向高纬度的海盆递减。浅海陆架区浮游植物的群落结构在不同融冰阶段发生显著的变化，主要优势种从中心硅藻演替为羽纹硅藻。典范对应分析（CCA）分析显示西北冰洋浮游植物划分为两个不同群落，水温、海冰、覆盖率和硅酸盐是影响浮游植物分布最主要的环境因子。这些发现有助于预示浮游植物对北极海冰快速融化的响应。 |
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