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1.
大亚湾海域锥状斯氏藻赤潮及其与孢囊的关系 总被引：22，自引：0，他引：22
用沉积物捕捉器取样，研究了大亚湾海域２０００年６～９月孢囊（Ｃｙｓｔ）种群动态，同时 分析了浮游植物种群动态。研究期间（８～９月）该海域发生了一起大规模的锥状斯氏藻赤潮。 赤潮前一个月，锥状斯氏藻孢囊的平均日形成率为２．０５× １０５ｃｙｓｔｓ／（ｍ２·ｄ），丰度为５０．２２％， 该时期以有性生殖产生的静止期孢囊为主；在赤潮盛期的８，９月初，孢囊的平均日形成率达到 ２．０１ ×１０６ｃｙｓｔｓ／（ｍ２·ｄ），丰度为９６．９７％，此时期的孢囊多为营养细胞所形成的暂时性孢囊； 赤潮结束后，由于环境条件的恶化，暂时性孢囊的形成达到高峰，平均日形成率为１．２４×ｌ０７ ｃｙｓｔｓ／（ ｍ２·ｄ），丰度为９９.５３％。结果表明大亚湾丰富的孢囊是潜在的种源（Ｓｅｅｄ ｂｅｄ），２０００年 的夏季、秋李持续高温（＞２５℃），台风减少及风力减弱等有利锥状斯氏藻的环境条件诱发孢 囊萌发，开始了该种类的赤潮。 相似文献
2.
大型海藻龙须菜与锥状斯氏藻间的营养竞争研究 总被引：13，自引：1，他引：13
利用生物和化学方法研究了大型海藻龙须菜（Gracilaria lemaneiformis）与赤潮生物锥状斯氏藻（Scrippsiella trochoidea （Stein） Loeblich Ⅲ）共培养时二者的生长情况,以及二者之间营养盐NO-3、PO3-4竞争的情况.结果显示,两者共培养时,由于龙须菜的影响,锥状斯氏藻的生长周期以及所能达到的最大细胞密度与对照组相比都有所下降,且受抑制程度随龙须菜起始密度的增大而增强;而锥状斯氏藻对于龙须菜的生长不构成明显的影响.当龙须菜起始密度较低时（0.2、0.1gFW/L）,共培养组微藻细胞密度的下降是因为水体中NO-3的耗尽;当龙须菜起始密度较高时（0.5gFW/L）,共培养组微藻细胞密度的下降可能是因为龙须菜与微藻之间的“互荫效应”,或者龙须菜能够分泌出足够浓度的克生物质所致.龙须菜可作为有效吸收营养盐的大型海藻,用以降低近海水域富营养化程度及有害赤潮发生的几率. 相似文献
3.
随着船舶压载水的转运,我国面临严重的外来入侵生物风险,其中部分赤潮藻形成的孢囊可成为赤潮的"种源",严重危害近岸海洋环境,因而快速有效地杀灭赤潮藻孢囊至关重要。本文利用大气压强电离放电高效生成的羟基自由基（·OH）,对典型赤潮藻锥状斯氏藻孢囊进行杀灭研究。采用萌发实验、SYTOX Green荧光染色法确定·OH杀灭锥状斯氏藻孢囊的阈值和时间,扫描电子显微镜观察孢囊的形态变化。结果表明,·OH杀灭孢囊的CT阈值为0.49 mg·min/L,时间为10 s,·OH氧化降解孢囊体内叶绿素,破坏DNA,抑制萌发,具有其他方法无法比拟的优势。因此,·OH快速杀灭赤潮藻孢囊的新方法,对防控外来入侵生物引发的海洋赤潮灾害具有重要的作用。 相似文献
4.
Scrippsiella trochoidea (Stein) Loeblich III was grown in a nitrogen-or phosphorus-limited batch culture system in laboratory. Growth rates and cellular
Chl-a were measured as functions of nitrate and phosphate concentrations. Growth rates were hyperbolic with both nitrate and
phosphate concentration and fit the Monod equation. The minimum cell quota of nitrogen and phosphorus and then the optimum
N∶P ratio ofS. trochoidea were estimated in this study. Measurement of phosphate concentration in Jiaozhou Bay suggest that phosphorus is the limiting
factor ofS. trochoidea growth.
Contribution No. 3679 from the Institute of Oceanology, Chinese Academy of Sciences.
Project 39790110 supported by NSFC, the study aslo supported by the National Climbing Project B (PDBG-7-2) and partly supported
by an MF grant from Hong Kong University of Science and Technology. 相似文献
5.
6.
A bloom of the dinoflagellate Scrippsiella trochoidea was detected for the first time in inner Tolo Harbor,Hong Kong in 2 000. Water samples were collected at eight stations along a transect passing through a red tide patch for microscopic analysis of phytoplankton composition and high-performance liquid chromatography(HPLC) analysis of phytoplankton pigments. During the bloom,the density of dinoflagellates was 1.1×106 cells L-1 within the patch and 8.6×105 cells L-1 outside the patch where the phytoplankto... 相似文献
7.
ImODUcnONThemacronutrientShitrogen,phosphorus,andsiliconhaveoftenboconsidedtodritthegroWthrateofmarinephytoplankton.RamtstudAsreveatalthattraeernetalAncronutrientSmaybeofsignilicanceintheerelogyofphytoplankton(RueterandUnsworth,l99l,Brandetal.,1983,HatheonandMore,l986).IronisacomPonentofmanyalgaeproteinsparticularlytwortantforbiosynthesisofchiorophyllandeleCtrntIansportrmCtionsofrespthetionandphotosynthesis,andisCrUdalfornitrogenmetaboljsmdriusehemeandiron-stilfUrcomPoundsarethecofact… 相似文献
8.
Effects of Fe and Mn on the growth of a red tide dinoflagellateScrippsiella trochoidea (Stein) Loeblch III 总被引：1，自引：0，他引：1
Batch culture experiments were conducted with a red tide dinoflagellateScrippsiella trochoidea (Stein) Loeblch III collected from Jiaozhou Bay, Shangdong, China. Growth rates and oellular Chl—a were measured in media
with iron and manganese ion concentrations controlled at different levels using EdTA-trace metal buffer systems. Cell density
increased 3.2 times to 6.5 times over the range of lowest (0 mol/L) to highest (10−5 mol/L) iron and manganese ion concentrations. The range of cell density response was much lower than the range of total available
iron and manganese, which was >100—fold that of Fe. This nonlinear relationship indicates that the cells adapt to make more
efficient use of iron and manganese under limiting conditions. The cellular Chl—a content maximized after 3 days incubation
and then decreased gradually under either iron or manganese limitation conditions. It indicated that the algae gained higher
photosynthesis ability when transferred to a new environment. Growth responses to iron and manganese limitation can be both
modeled according to the equation of Monod. The half—saturation constant for growth,k, is 4.6×10−8 mol/L for Fe and 5.1×10−8 mol/L for Mn. Our results showed that the iron availability in Jiaozhou Bay does not limit the growth ofS. trochoidea.
Contribution No. 2831 from the Institute of Oceanology, Chinese Academy of Sciences.
Project 9389008 supported by NSFC; Study supported by PDB6. 相似文献
9.
A bloom of the dinoflagellate Scrippsiella trochoidea was detected for the first time in inner Tolo Harbor, Hong Kong in 2 000. Water samples were collected at eight stations
along a transect passing through a red tide patch for microscopic analysis of phytoplankton composition and high-performance
liquid chromatography (HPLC) analysis of phytoplankton pigments. During the bloom, the density of dinoflagellates was 1.1×106 cells L−1 within the patch and 8.6×105 cells L−1 outside the patch where the phytoplankton community was dominated by diatoms. After the bloom the S. trochoidea began to decrease in density and was replaced by diatoms as the dominating bloom-causing organisms at all stations, and the
density of dinoflagellates at most stations was less than 1.0 × 106 cells L−1. The status of S. trochoidea as the causative species of the bloom was indicated by the presence of peridinin, the marker pigment for dinoflagellates.
The shift from dinoflagellates to diatoms was marked by the decline of peridinin and the prevalence of fucoxanthin. Phytoplankton
pigment markers also revealed the presence of other minor phytoplankton assemblages such as cryptomonads and blue-green algal. 相似文献
10.
We present results on the effect of modified clay on cyst formation of Scrippsiella trochoidea in harmful algal bloom （HAB）. Modified clay （in concentration of 0, 0.1, 0.5, and 1.0 g/L） were added to cultures, and observations were made on cysts of S. trochoidea under controlled laboratory conditions. Results indicate that the removal rate of algal cells reached 97.7% at the clay concentration of 1.0 g/L. The cyst formation rate increased from 4.6% to 24.6% when the concentration of clay was increased from 0 to 1.0 g/L. Two cyst metamorphs were observed： spinal calcareous cysts and smooth noncalcareous ones. The proportion of the spinal cysts decreased from 76.9% to 24.1% when clay concentration increased from 0 to 1.0 g/L. In addition, modified clay affected cyst germination. The germination rate decreased with the increases in the clay concentrations. Non-calcareous cysts had a lower germination rate with a longer germination time. We conclude that modified clay could depress algal cell multiplication and promote formation of temporal cysts of S. trochoidea, which may help in controlling HAB outbreaks. 相似文献