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象山港硅藻赤潮过程中真菌群落演替及互作特征 被引量:2
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作者 谢伟娟 陈晨 +4 位作者 赵志颖 张继宁 侯繁荣 张德民 张化俊 《微生物学通报》 CAS CSCD 北大核心 2021年第11期3958-3970,共13页
【背景】近岸海域赤潮的发生能显著改变包括真菌在内的微生物群落组成,进而影响海洋中碳氮元素循环。真菌是海洋中重要的分解者,但赤潮过程对真菌群落的影响少有报道。【目的】探明赤潮过程对真菌群落的影响,对进一步阐释赤潮对生态系... 【背景】近岸海域赤潮的发生能显著改变包括真菌在内的微生物群落组成,进而影响海洋中碳氮元素循环。真菌是海洋中重要的分解者,但赤潮过程对真菌群落的影响少有报道。【目的】探明赤潮过程对真菌群落的影响,对进一步阐释赤潮对生态系统中物质循环的影响具有重要意义。【方法】针对2017年春季象山港硅藻赤潮,对真菌内源转录间隔区1 (Internally Transcribed Spacer 1,ITS1)序列进行高通量测序,研究赤潮过程中真菌群落响应及共现性特征。【结果】真菌群落的α多样性指数在赤潮暴发的各阶段差异显著,而且均与磷酸盐、硝酸盐和亚硝酸盐有显著相关性(P<0.05)。子囊菌门(Ascomycota,90.2%)和担子菌门(Basidiomycota,8.27%)是本次硅藻赤潮的优势菌门,其中子囊菌门遍布赤潮暴发的4个阶段;锤舌菌纲(Leotiomycetes,16.1%)和散囊菌纲(Eurotiomycetes,9.3%)是纲水平上的主要优势类群。赤潮暴发过程中硝酸盐、亚硝酸盐、磷酸盐和温度等环境因素的改变,驱动真菌群落组成及结构发生显著变化。Helotiales、Eurotiales、Xylariales、Saccharomycetales和Agaricostilbales构成了真菌群落共现网络的主体。【结论】真菌群落在赤潮的各阶段具有显著的演替特征,赤潮藻生消是引起真菌群落演替的主要因素,但是环境因子也扮演着重要角色。赤潮过程中,真菌群落同类群内的互作要强于不同类群间的互作,这对维持群落的稳定性具有重要意义。 展开更多
关键词 硅藻赤潮 真菌群落 高通量测序 象山港
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东海春季赤潮前后沉积物-海水界面营养盐交换速率的研究 被引量:9
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作者 胡佶 张传松 +1 位作者 王修林 王江涛 《环境科学》 EI CAS CSCD 北大核心 2007年第7期1442-1448,共7页
应用实验室培养法现场研究了3~5月东海硅藻赤潮发生前后10个站位的营养盐在沉积物-海水界面的交换,并应用连续函数拟合法计算了营养盐的界面交换速率.结果显示,NO3--N在赤潮前向沉积物中汇聚[-1.33^-0.68 mmol/(m2.d)],赤潮后却基本由... 应用实验室培养法现场研究了3~5月东海硅藻赤潮发生前后10个站位的营养盐在沉积物-海水界面的交换,并应用连续函数拟合法计算了营养盐的界面交换速率.结果显示,NO3--N在赤潮前向沉积物中汇聚[-1.33^-0.68 mmol/(m2.d)],赤潮后却基本由沉积物向海水中释放[-0.69~0.82 mmol/(m2.d)].NH4+-N在赤潮前后大都从沉积物中释放[-0.65~1.46mmol/(m2.d)],赤潮后释放速率小于赤潮前.NO2--N赤潮前后除Zc17站外都向沉积物中汇聚[-0.09~0.05 mmol/(m2.d)],赤潮后汇聚速率稍高.SiO23--Si在所有站位都由沉积物向海水释放[0.85~9.23 mmol/(m2.d)],其赤潮后速率高于赤潮前.PO34--P在赤潮前向沉积物中汇聚[-0.06^-0.01 mmol/(m2.d)],在赤潮后却由沉积物向海水中释放[0~1.26 mmol/(m2.d)].NO3--N和PO43--P向东海近海沉积物的汇聚在春季不利于硅藻赤潮的暴发,但其在硅藻赤潮暴发后从沉积物的大量释放为后面紧接的大面积甲藻赤潮的暴发提供了重要的营养物质补充. 展开更多
关键词 东海 沉积物-海水界面 营养盐 交换速率 硅藻赤潮
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A COMPARISON OF EASTERN AND WESTERN HONG KONG PHYTOPLANKTON FROM WEEKLY SAMPLES (1997-1999) 被引量:4
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作者 Mike Dickman 唐森铭 Jessie Lai 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2002年第1期52-61,共10页
Weekly phytoplankton samples were taken from western Hong Kong (Lamma) from Jan. 1997 to Dec. 1999 and from Port Shelter in Eastern Hong Kong from January 1998 to December 1999. During that time diatom blooms occurred... Weekly phytoplankton samples were taken from western Hong Kong (Lamma) from Jan. 1997 to Dec. 1999 and from Port Shelter in Eastern Hong Kong from January 1998 to December 1999. During that time diatom blooms occurred repeatedly at both sites but never in synchrony. One species would bloom at one site and then weeks later it or another species would bloom at the other site; while the 1998 red tide of the mucus producing dinoflagellate Gymnodinium mikimotoi occurred at both sites. It first occurred at the Port Shelter site in March and did not appear at the Lamma site until April. With the single exception of this species, no other dinoflagellate reached bloom concentrations at the Lamma site. In addition, dinoflagellate abundance at the Lamma site was significantly lower (P <0.05) than that at the Port Shelter site. This was correlated with a significantly higher turbidity (i.e. low Secchi transparency) and higher turbulence (stronger currents) at the Lamma site. Annual variation in surface temperature correlated with total surface phytoplankton abundance at both our sample sites. Phytoplankton abundance increased in spring as water temperatures warmed. In fall, as surface water temperatures began to decline and the monsoon rains became less frequent there was a reduction in phytoplankton abundance associated with the reduction in temperature and light. Because so many variables co-occur with temperature (e.g. the amount of rainfall, light intensity and light duration etc.) it is not possible to cite temperature as the causal factor associated weth controlling phytoplankton abundance at our two sample sites. Our data support the rather controversial notion that percentage-wise, there are relatively more harmful bloom forming species in nutrient-rich coastal waters than there are in the world’s oceans. 16% of the dinoflagellate species and 10.3% of the diatom species observed at our two sample sites were classed as harmful. These percentages were higher than those cited by Sournia (1995) for the worlds oceans (9.6% and 6.8% respectively). This raises the possibility that there are relatively more toxic species in the nutrient-rich coastal waters of the world than there are in the mid ocean nutrient-poor areas of the world. Some reasons for this are briefly discussed. 展开更多
关键词 red tides phytoplankton periodicity South China Sea harmful algal blooms
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Identification of two Skeletonema costatum-like diatoms by fluorescence in situ hybridization 被引量:1
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作者 张宝玉 陈国福 +1 位作者 王广策 陆斗定 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2010年第2期310-314,共5页
A harmful algae bloom (HAB) is a dense aggregation of algae in a marine or aquatic environment that can result in significant environmental problems. To forecast the occurrence of HAB, development of a rapid and preci... A harmful algae bloom (HAB) is a dense aggregation of algae in a marine or aquatic environment that can result in significant environmental problems. To forecast the occurrence of HAB, development of a rapid and precise detection method is urgently required. In this study, two Skeletonema costatum-like diatoms (SK-1 and SK-2), were identified morphologically under a light microscope, and detected using fluorescent in situ hybridization (FISH). Strain SK-1 was isolated from a frequently HAB affected area of the East China Sea, and strain SK-2 from an aquatic farm in Qingdao, China. Fluorescent DNA probes were designed that were complementary to the ITS sequence (including 5.8S rDNA) of strain SK-1. After hybridization, strong green fluorescence was observed in cells of strain SK-1 under an epifluorescence microscope; however, no such fluorescence was observed with strain SK-2, which indicates that probes hybridized only the DNA of the target strain, SK-1, in species-specific manner, and that the two strains do not belong to a same species. This finding was confirmed by ITS sequence analysis. The FISH technique used in this study was sensitive, simple, and rapid, and is a promising tool for detecting target HAB species in natural environments. 展开更多
关键词 fluorescent in situ hybridization ITS sequence Skeletonema costatum harmful algal bloom
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Nano-and microphytoplankton community characteristics in brown tide bloom-prone waters of the Qinhuangdao coast,Bohai Sea, China 被引量:3
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作者 XU Xin YU ZhiMing +3 位作者 HE LiYan CHENG FangJin CAO XiHua SONG XiuXian 《Science China Earth Sciences》 SCIE EI CAS CSCD 2017年第6期1189-1200,共12页
Since 2009, the newly recorded species Aureococcus anophagefferens has successively induced brown tides in the Qinhuangdao coastal waters of the Bohai Sea. Here, we focus on the phytoplankton community structure in th... Since 2009, the newly recorded species Aureococcus anophagefferens has successively induced brown tides in the Qinhuangdao coastal waters of the Bohai Sea. Here, we focus on the phytoplankton community structure in this region and try to point out the biological background characteristics of the outbreaks of successive brown tides. We analyzed species composition,cell abundance, diversity indices and size-fractionated chlorophyll a(Chl-a) concentration monthly from March 2013 to January2014. The phytoplankton community, as observed by microscopy, underwent succession from nano-celled chained diatoms to dinoflagellates in the spring and summer, and then to micro-celled diatoms and nano-celled chained diatoms as the most prominent groups in the subsequent autumn and winter. Canonical correspondence analysis revealed that changes in the abundance of diatoms were related to nutrient availability, especially of nitrogen, while water temperature was the crucial factor influencing the abundance of dinoflagellates and A. anophagefferens. Considering the contribution of nano-celled chained species to the micro-sized Chl-a,small phytoplankton(<20 μm) composed the majority of total Chl-a and were generally abundant during our study. Abundant and diverse small phytoplankton seemed to serve as a background or seedbank for the formation of blooms of A. anophagefferens and other small-celled algae. 展开更多
关键词 Phytoplankton community Qinhuangdao coast Species composition Cell abundance Size fractions Canonical correspondence analysis Aureococcus anophagefferens
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