Cyanobacteria in New Zealand inland waters: Experimental studies   总被引：1，自引：1，他引：0  

Anthony B. Viner 《新西兰海洋与淡水研究杂志》2013,47(3):503-507

A small volume of experimental work with cyanobacteria in New Zealand has been produced through the last two decades. Except for some studies with geothermal organisms biased to New Zealand conditions, most work has followed the world‐wide trends in cyanobacterial research. There has been some emphasis on N₂‐fixing species, but symbiotic relationships, metabolic kinetics, nutrient and other environmental factors promoting ecological dominance, and toxicity have been investigated.  相似文献   

ENCLOSURE EXPERIMENTS ON AND LACUSTRINE PRACTICE FOR ELIMINATING MICROCYSTIS BLOOM     

刘建康  谢平 《中国海洋湖沼学报》2002,(2)

ＩＮＴＲＯＤＵＣＴＩＯＮＭｉｃｒｏｃｙｓｔｉｓａｅｒｕｇｉｎｏｓａｗａｓｔｈｅｍａｉｎｂｌｏｏｍ ｆｏｒｍｉｎｇｓｐｅｃｉｅｓｉｎＤｏｎｇｈｕＬａｋｅ;ｏｃｃｕｒｒｅｄｏｎｌｙｓｐｏｒａｄｉｃａｌｌｙｉｎｔｈｅ 1 950ｓ,ｉｎｃｒｅａｓｅｄｒａｐｉｄｌｙｉｎｎｕｍｂｅｒｉｎｔｈｅ 1 960ｓ.Ｆｒｏｍｔｈｅｍｉｄｄｌｅｏｆｔｈｅ 1 970ｓｔｏｔｈｅｍｉｄｄｌｅｏｆｔｈｅ 1 980ｓ,ｔｈｉｃｋｌａｙｅｒｏｆｉｔｓｂｌｏｏｍｃｏｖｅｒｅｄｔｈｅｌａｋｅｓｕｒｆａｃｅｅｖｅｒｙｓｕｍｍｅｒ,ａｔｔｒａｃｔ ｉｎｇｆｏ…  相似文献   

Contributions of phosphatase and microbial activity to internal phosphorus loading and their relation to lake eutrophication   总被引：3，自引：2，他引：3  

SONG Chunlei  CAO Xiuyun  LI Jianqiu  LI Qingman  CHEN Guoyuan  ZHOU Yiyong 《中国科学D辑(英文版)》2006,49(Z1)

Phosphatase may accelerate the process of lake eutrophication through improving phosphorus bioavailability. This mechanism was studied in three Chinese eutrophic shallow lakes (Lake Taihu, Lake Longyang and Lake Lianhua). Phosphatase activity was related to the concentration of soluble reactive phosphorus (SRP) and chlorophyll a. Stability of dissolved phosphatase in reverse micelles may be attributed to molecular size, conformation and active residues of the enzyme. At the site with Microcystis bloomed in Lake Taihu, dissolved phosphatase activity was higher and more stable in micelles, SRP concentrations were lower in interstitial water, the contents of different forms of phosphorus and the amounts of aerobic bacteria were lower while respiration efficiency was higher in sediments. Phosphobacteria, both inorganic and organic and other microorganisms were abundant in surface water but rare in sediments. Therefore, internal phosphorus may substantially flux into water column by enzymatic hydrolysis and anaerobic release, together with mobility of bacteria, thereby initiating the bloom. In short, biological mechanism may act in concert with physical and chemical factors to drive the internal phosphorus release and accelerate lake eutrophication.  相似文献   

The decline process and major pathways of Microcystis bloom in Taihu Lake, China   总被引：1，自引：0，他引：1  

汪志聪  李国文  李根保  李敦海 《中国海洋湖沼学报》2012,30(1):37-46

Eutrophication has become a serious concern in many lakes, resulting in cyanobacterial blooms. However, the mechanism and pathways of cyanobacteria decline are less understood. To identify and define the growth and decline of Microcystis blooms in Taihu Lake of China, and to illuminate the destination of surface floating blooms, we investigated the biomass distribution and variations in colony size, morphology, and floating velocity from October 2008 to September 2009. The results showed that the Microcystis bloom declined in response to biomass decrease, colony disaggregation, buoyancy reduction, and increased phytoplankton biodiversity, and these indicative parameters could be applied for recognition of the development phases of the bloom. Three major decline pathways were proposed to describe the bloom decline process, colony disaggregation (Pathway Ⅰ), colony settlement (Pathway Ⅱ), and cell lysis in colonies (Pathway Ⅲ). We proposed a strategy to define the occurrence and decline of Microcystis blooms, to evaluate the survival state under different stress conditions, and to indicate the efficiency of controlling countermeasures against algal blooms.  相似文献   

太湖群体微囊藻对同形溞(Daphnia similis)生长和繁殖影响的模拟     

戴曦  陈非洲 《湖泊科学》2012,24(1):149-155

富营养湖泊中蓝藻水华对枝角类种群和群落结构有显著的影响,但自然条件下群体微囊藻对大型枝角类溞属不同种类的影响仍存在争议.本研究通过两次为期各10 d的模拟实验,利用过滤后的太湖原水模拟群体微囊藻(20～100μm和100 ～200 μm)添加对大型枝角类同形溞(Daphnia similis)种群特征的影响,结果显示两次实验的同形溞均大量存活,不同浓度和颗粒大小的群体微囊藻对其生长和繁殖的影响不同,添加群体微囊藻的同形溞的生长和繁殖显著大于未添加微囊藻的.说明在自然条件下藻毒素对同形溞种群并没有明显的抑制作用,同形溞能够与微囊藻水华共存,其种群特征与微囊藻群体大小组成和生物量有关.  相似文献   

太湖微囊藻的生长动力学     

陈伟民  陈宇炜  高锡云 《湖泊科学》1998,10(S1):347-356

Following the development of local industries, agriculture and the increase of living standard of people, Lake Taihu is in the meso-eutrophication stage. The main eutrophication part in this lake is the Meiling Bay. The dominant phytoplankton species are Microcystis, Anabena, Melosira, Cyclotella and Cryptomonas. In summer, Microcystis spp. occupys 85% of algae biomass and form the water bloom. This causes the trouble for the people lived around the lake, especially for the drinking water of Wuxi City.The Microcystis intrinsic rate was high, the Max. growth rate 1.27. Besides Microcystis own characteristics, its growth depended on irradiation, temperature and nutrients, especially the phosphorus. This paper also discussed the possibility of biomanipulation for restoration of lake ecology and the control strategy of lake eutrophication.  相似文献   

微生物对太湖微囊藻的好氧降解研究   总被引：6，自引：1，他引：5  

陈伟民  蔡后建 《湖泊科学》1996,8(3):248-252

通过模拟实验研究了微生物对微囊藻残体的降解作用。水体内悬浮质和各主要形态磷浓度的变化结果表明：微囊藻的好氧分解符合一级动力学,其乳浮质和颗粒性磷的浓度呈指数关系递减,降解速度分别为０．２２７／ｄ和０．０８８／ｄ。经３２ｄ降解后,水体内的总溶解磷和可达总磷的５３％,而ＴＤＰ的主要成分为ＰＯ＾３－Ｒ。  相似文献   

四种沉水植物的克藻效应   总被引：47，自引：0，他引：47  

鲜啟鸣  陈海东  邹惠仙  尹大强  龚惠娟  曲丽娟 《湖泊科学》2005,17(1):75-80

设计一系列试验研究了四种沉水植物(金鱼藻、微齿眼子菜、苦草、伊乐藻)对铜绿微囊藻的抑制作用．单独培养试验结果显示金鱼藻和微齿眼子菜具有较强的抑制藻类生长的作用,连续滴加种植水试验显示抑藻作用进一步加强．在植物的生长过程中其化感物质是连续释放的．并考察N、P等营养因素及微生物干扰对抑藻实验的影响．  相似文献   

磷化氢及其氧化产物动态释放对铜绿微囊藻(Microcystis aeruginosa)生长的影响   总被引：5，自引：0，他引：5  

牛晓君  张景飞  史小丽  王晓蓉  高光  季江  DietmarGlindemann 《湖泊科学》2003,15(3):263-268

提要就磷化氢释放对铜绿微囊藻的生长进行了研究,采用藻类生长潜力试验(AGP)的方法,研究了磷化氢及其氧化产物亚磷酸盐、次亚磷酸盐对水华暴发优势藻类(铜绿微囊藻)的生长的影响,结果表明：磷化氢及其氧化产物对铜绿微囊藻的生长有重要的影响。富营养水体磷化氢的释放可能在引起湖泊水华暴发中起到了重要的作用。  相似文献   

浮游绿藻对沉水植物苦草生长的抑制作用   总被引：2，自引：0，他引：2  

黎慧娟  倪乐意 《湖泊科学》2007,19(2):111-117

水体中氧化还原电位的变化会对藻类生长和竞争产生直接或间接的影响.本文采用单种培养和混合培养的方式,研究了在铜绿微囊藻(Microcystis aeruginosa)与斜生栅藻(Scenedesmus obliquus)竞争生长过程中氧化还原电位降低对铜绿微囊藻优势形成的影响,同时测定了铜绿微囊藻生理和形态的变化.结果表明:在单种培养条件下,铜绿微囊藻的生长速率明显高于栅藻,降低氧化还原电位对两种藻的生长速率没有影响;在混合培养条件下,两种藻的生长均受到了抑制,但降低氧化还原电位却明显提高了铜绿微囊藻的生长速率,而降低了斜生栅藻的生长速率,说明铜绿微囊藻的竞争能力得到了加强,斜生栅藻的竞争能力有所削弱;同时试验也发现在竞争生长的条件下,培养基氧化还原电位的降低诱导了铜绿微囊藻细胞体积变大,酯酶活性增强以及叶绿素荧光强度增加,这些生理参数的改变可能是铜绿微囊藻在环境中氧化还原电位降低时竞争能力得以增强的重要原因.  相似文献