Wang Chaofeng, Yang Mengyao, He Yan, Xu Zhiqiang, Zhao Yuan, Zhang Wuchang, Xiao Tian
CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, China.
Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China.
Front Microbiol. 2022 Jun 9;13:881048. doi: 10.3389/fmicb.2022.881048. eCollection 2022.
Planktonic ciliates are an important component of microzooplankton, but there is limited understanding of their responses to changing environmental conditions in the Pacific Arctic Region. We investigated the variations of ciliate community structure and their relationships with environmental features in the Pacific Arctic Region in the summer of 2016 and 2019. The Pacific water was warmer and more saline in 2019 than in 2016. The abundance and biomass of total ciliate and aloricate ciliate were significantly higher in 2019 than those in 2016, while those of tintinnid were significantly lower. The dominant aloricate ciliate changed from large size-fraction (> 30 μm) in 2016 to small size-fraction (10-20 μm) in 2019. More tintinnid species belonging to cosmopolitan genera were found in 2019 than in 2016, and the distribution of tintinnid species (, , and sp.1) in 2019 expanded by 5.9, 5.2, and 8.8 degrees further north of where they occurred in 2016. The environmental variables that best-matched tintinnid distributions were temperature and salinity, while the best match for aloricate ciliate distributions was temperature. Therefore, the temperature might play a key role in ciliate distribution. These results provide basic data on the response of the planktonic ciliate community to hydrographic variations and implicate the potential response of microzooplankton to Pacification as rapid warming progresses in the Pacific Arctic Region.
浮游纤毛虫是微型浮游动物的重要组成部分，但我们对它们在太平洋北极地区对不断变化的环境条件的反应了解有限。我们调查了2016年和2019年夏季太平洋北极地区纤毛虫群落结构的变化及其与环境特征的关系。2019年的太平洋海水比2016年更温暖、盐度更高。2019年总纤毛虫和无甲纤毛虫的丰度和生物量显著高于2016年，而砂壳纤毛虫的丰度和生物量则显著低于2016年。占主导地位的无甲纤毛虫从2016年的大尺寸级分（>30μm）变为2019年的小尺寸级分（10 - 20μm）。2019年发现的属于世界性属的砂壳纤毛虫种类比2016年更多，并且2019年砂壳纤毛虫种类（、和sp.1）的分布比2016年向北扩展了5.9、5.2和8.8度。与砂壳纤毛虫分布最匹配的环境变量是温度和盐度，而与无甲纤毛虫分布最匹配的是温度。因此，温度可能在纤毛虫分布中起关键作用。这些结果提供了浮游纤毛虫群落对水文变化反应的基础数据，并暗示了随着太平洋北极地区快速变暖，微型浮游动物可能的反应。
