排序方式: 共有28条查询结果,搜索用时 15 毫秒
1.
2.
3.
INTRODUCTIONCryptomonasisunicellularbiflagellatewhichisacommongenusofCryptophyta .Thecellsareusuallystronglycompressedlaterally .ThereareoneortwolargeChloroplaststhatcontainchlorophylla ,c ,somecharacteristiccarotenoidsandphycobilinpigments (Huetal.,1 997;Wei… 相似文献
4.
Phaeocystis globosa Scherffel, a harmful microalga, and its production of dimethylsulfoniopropionate
The production of dimethylsulfoniopropionate (DMSP) and its cleavage products (DMS) are well studied in phytoplankton worldwide. However, less is known about their sources, distributions, and impacts in the coast of China. We examined the production of DMSP and DMS in Phaeocystis globosa Scherffel and other benthic macroalgae from the South China coast in relation to environmental conditions. P. globosa was a harmful marine microalgal species and its bloom took place in the eutrophic waters along the South China Sea frequently. It also produced high content of DMSP at different growth stages, with the highest concentration usually observed in the stationary period. Moreover, the production of DMSP in P. globosa was significantly affected by salinity and temperature with the highest contents associated with high salinity (e.g. 40) and low temperature (e.g. 20°C). In field benthic macroalgae, there was also a marked difference in the DMSP of various species or different samples of the same species. Chlorophyll a contents were also determined for each macroalgal species. The highest chlorophyll a (238.7 ng/g fresh weight) was recorded in Chlorophyta Ulva lactuca at Guishan Island (Zhuhai), while the lowest value (1.5 ng/g fresh weight) was found in Rhodophyta Gracilaria tenuistipitata in Zhanjiang. Further correlation analysis indicated that there was no significant relationship between the content of DMSP and chl-a in macroalgae samples (P > 0.05). All the results suggested that the production of DMSP in marine algae was not only species- and stage-related, but also greatly affected by various environmental factors. 相似文献
5.
6.
湛江港浮游植物与赤潮植物的初步研究 总被引:12,自引:1,他引:12
于1987年8月在湛江港设13个点采样。鉴定表明,共有浮游植物37属94种和变种;优势种类有中肋骨条藻、日本星杆藻、佛氏海毛藻等。湛江港浮游植物密度较高,港内外平均达1.3×104cell/L和7.3×105cell/L。经单项营养指数和营养状态结合指数分析表明,除两个点无机氮浓度略超标外,所有站位均未达到富营养化水平。调查期间,共发现赤潮生物31种,其中主要有中肋骨条藻、日本星杯藻、佛氏海毛藻、尖刺菱形藻和夜光藻等,中肋骨条漠和日本星杆藻曾形成水华。 相似文献
7.
大鹏湾几种赤潮甲藻的分类学研究 总被引:24,自引:3,他引:24
对采自深圳大鹏湾的5种赤潮甲藻进行了分类学研究。其中海洋原甲藻属pro-rocentrum2种:P.micans Ehrenberg,P.minimum(Pavillard)Schiller;亚历山大属Alexandrium2种:Atamarense(Lebour)Balech,A.catenella(Whedon&Kofoid)Ba-lech;施克里普藻属Scrippsiella1种:S.tro 相似文献
8.
9.
10.
紫外光对有毒甲藻塔玛亚历山大藻的生态学效应 总被引:21,自引:1,他引:21
对1991年分离自南海大鹏湾海域的塔玛亚历山大藻单克隆培养林在不同光照条件、辐射强度(9.5,5.9W/m2)(辐射剂量为:95,190,380,760,1520J/m2)和营养盐(N,P)浓度下,进行紫外辐射敏感性的研究。结果表明,紫外辐射可以导致细胞变形、增大和死亡。不论在什么条件下,低剂量的紫外辐射(95J/m2)就能使该藻的存活率和生长率大幅下降。此后,随着辐射剂量的增加,虽然存活率和生长率继续下降,但下降幅度渐缓。充足的营养盐和辐射处理后的连续光照对藻群的恢复有益,但在缺氮和缺磷条件下培养的藻群,可能由于生理活性减弱而导致对紫外辐射敏感性的迟钝。辐射强度对该藻的紫外辐射敏感性的影响十分显著,而且与辐射剂量具有明显的双重效应。 相似文献