摘要
利用荧光显微技术(Epifluorescence microscopy,EFM)对2006年夏季北黄海水域80个站点的微微型浮游植物进行了检测,并对其在平面和垂直分布上的变化以及昼夜变化情况进行了研究。检测到聚球藻(Synechococcus,Syn)和真核球藻(Picoeukaryotes,Euk)两类微微型浮游植物,未检测到原绿球藻(Prochlorococcus,Pro),其中Syn以富含藻红素的Syn细胞(PE细胞)为优势种类,而富含藻蓝素的Syn细胞(PC细胞)数量较少。在荣城湾以东的水域,各水层Syn和Euk的丰度都较其它水域的高。Syn在北黄海冷水团及附近水域下30m深处和底层水体中出现明显的低值区,Euk丰度受冷水团影响不明显。在垂直分布上,水表层和水下10m深处Syn的丰度高于水下30m深处和底层,而Euk在垂直分布上无明显差异。在昼夜变化上,各水层Syn、Euk丰度的白昼与夜间变化趋势无明显区别。
Aims The North Yellow Sea is a typical model for marine ecologic systems of the North Temperate Zone. Over the past decade, much non-biological research had been done in multidisciplinary projects. Our aims were to provide basic biological information for marine picoplanktonic study.
Methods Water samples were collected from 80 stations in the North Yellow Sea in August 2006 and immediately fixed in situ with paraformaldehyde （final concentration： 1%）. After treatment for 15 to 20 min, samples were transferred into liquid nitrogen for deep freezing and then stored in -80 ℃ for laboratory analysis. Picophytoplankton was examined using epifiuorescence microscopy, and the components, distribution and diurnal variations of picophytoplankton in the sea were analyzed.
Important findings Two groups of picophytoplankton were found, Synechococcus （Syn） and picoeukaryotes （Euk）. Phycoerythrin-rich Synechococcus （PE cells） dominated Syn in abundance （1.76×10^5 cells·ml^-1 on average） and phycocyanin-rich Synechococcus （PC cells） were less abundant （only contributed 5.48% of Syn abundance）. Syn and Euk were more abundant in northern Rongcheng Bay than other areas. There was extremely low Syn abundance in the Cold Water Mass of the North Yellow Sea at 30-m depth and 2-m depth above the bottom, whereas no low Euk abundance in the Cold Water Mass. In vertical distribution, Syn abundances at surface and 10-m depth were higher than at 30-m depth and 2-m depth above the bottom; however, no significant vertical changes in Euk concentration were found. There were no significant variations in both the Syn and Euk abundances at different depths in daytime and nighttime.
出处
《植物生态学报》
CAS
CSCD
北大核心
2008年第5期1184-1193,共10页
Chinese Journal of Plant Ecology
基金
国家908专项基金(908-01-ST02)
关键词
北黄海
微微型浮游植物
聚球藻
真核球藻
冷水团
North Yellow Sea, picophytoplankton, Synechococcus, picoeukaryotes, the Cold Water Mass
