【摘要】 自2002—2004年应用表面荧光显微镜计数法对胶州湾聚球菌(Synechococcusspp.)蓝细菌的季节变化、月变化及其对浮游植物总初级生产力的贡献进行调查研究。结果显示,胶州湾Synechococcusspp.丰度处于0.16×104—21×104cells/ml之间,最大与最小值之间相差约两个数量级,其中夏天Synechococcusspp.丰度最高,春、秋季相当,冬季最低。夏季Synechococcusspp.丰度平均值约是冬季的3—4倍。Synechococcusspp.的季节变化呈现一定周期性。Synechococcusspp.月最高值(21×104cells/ml)出现在8月的B2站表层,最低值(0.15×104cells/ml)出现在12月A1站表层。对18个月的胶州湾Synechococcusspp.水平分布进行分析,结果显示,河口和近岸区域Synechococcusspp.丰度相对较高。以D8站为典型站位对Synechococcusspp.垂直分布进行的分析发现,不同季节Synechococcusspp.最大值出现的水深不同。胶州湾Synechococcusspp.在总浮游植物生物量中所占的比例在0.2%—77%之间,平均为4.7%。此外,对2003—2004年温度与Syne-chococcusspp.丰度的相关性分析中发现,两者呈正线性相关(相关系数达0.6)。更多还原

【Abstract】 A unicellular cyanobacteria of the genus Synechococcus spp.occupy an important position at the base of the marine food web;they are among the most abundance members of the picoplankton in open ocean,and their contribution to primary production was estimated to be at 20%.In this study,the authors examined the variation in Synechococcus spp.abundance seasonally between 2002 and 2003,and monthly from 2003 to 2004.Sample was collected with 50 ml sterilized vials and fixed with glutaraldehyde(1% final concentration),filtered through a 0.2 μm black Nuclepore filter,mounted on a glass slide and examined under epifluorescence microscope.Synechococcus spp.would show yellow-orange autofluoresce when excited with blue light so that we could count the number in 20 fields randomly using Olympus BH-2 epifluorescence microscopy.The distribution of Synechococcus spp.in Jiaozhou Bay was investigated from May 2002 to Dec.2004.The(results) show that Synechococcus spp.abundance in Jiaozhou Bay ranged from 0.16×10~4 to 21×10~4 cells/ml.The maximum value was observed in summer,whereas the minimum value was in winter.The highest value(21×10~4 cells/ml) was observed in the surface layer in Station B2 in August,while the lowest value(0.15×10~4 cells/ml) was in the surface layer in Station A1 in December.The average value of Synechococcus spp.abundance in summer was 3—4 times higher than that in winter.The variation in Synechococcus spp.abundance was seasonal.The data obtained show that the abundance was obviously higher in near-shore and estuary than in any other parts of the bay.The highest value was recorded in different depths in different seasons in Station D8 that was(selected) as the experimental station for studying the vertical distribution of Synechococcus spp.in Jiaozhou Bay.The results in this study indicate that the light intensity could influence Synechococcus spp.distribution seen in some instances.Synechococcus spp.contributed 3.9% of the total primary biomass produced by phytoplankton biomass(estimated percentage of concentration of chlorophyll-a) from 2002 to 2004.A positive correlation between the variation in temperature and Synechococcus spp.abundance(covalent factor 0.6) was revealed in the study.更多还原