Dinoflagellate Cysts Records from Core Samples of Modern Marine Sediment at the Luoyuan Bay Mouth

通过对福建罗源湾口海域KMZK5柱状沉积物中甲藻孢囊的分析,共鉴定出15属30种甲藻孢囊。对比发现这30种甲藻孢囊是该湾以前未被记录的种类。其中12种是附近海域也未曾发现的种类,6种为有毒种类:缘亚历山大藻、小型亚历山大藻、塔玛亚历山大藻、具刺膝沟藻、链状裸甲藻、锥状斯氏藻.同时对甲藻孢囊的主要属种和有毒种类的丰度、分布在垂直方向上的变化特征进行了初步研究.Thirty species of dinoflagellate cysts in 15 genus are identified from KMZK5 Core samples of recent marine sediment at the Luoyuan Bay mouth,Fujian. All of these dinoflagellate cysts are first recorded in the Luyuan Bay,12 species of them are not distributing in the near sea area such as Sansha Bay and Minjiang estuary,including 6 kinds of toxic species,such as Alexandrium affine,A. minutum,A. tamarense,Gonyaulax spinifera,Gymnodinium catenatum and Scrippsiella trochoidea. The abundance and vertical distribution characterestics of the main and the toxic dinoflgellate cysts are also studied in the paper

The Benthic Diatom Community of the Xiangshan Bay

于2005年5月(春季)和11月(秋季)对浙江省象山港海域底栖硅藻进行采样调查,分析底栖硅藻的种类组成、丰度、优势种、多样性及群落结构的季节变化和平面分布特征,并讨论底栖硅藻与水温、盐度等环境因子之间的关系。共鉴定硅藻46属179种,硅藻种类数在春季共有46属164种,秋季减少到22属52种。种类组成以广温种为主,其次是暖水种和温水种。主要优势种有柱状小环藻(Cyclotella stylorum)、琼氏圆筛藻(Coscinodiscus jonesianus)等。细胞丰度范围在(0.007~6.851)×103个/g之间,平均值为1.522×103个/g。春季硅藻丰度较高,平均值为2.974×103个/g,秋季为0.071×103个/g。不同站位间硅藻的分布也表现出显著的差异,硅藻细胞丰度最高值位于港顶部鱼排密集区9号站位,春季细胞丰度值为6.851×103个/g,秋季细胞丰度值为0.143×103个/g。硅藻丰度较高的有位于鱼排区的3号、4号、5号、7号站位,其余较低。硅藻群落多样性指数和均匀度春季较高,秋季降低。底栖硅藻数量分布随季节变化明显,与盐度关系不大。The samples for the presen t study were collected from the surface sediments in the Xiangshan Bay,Zhejiang Province in May 2005 and November 2005 and were observed under a light microscope. The species composition, abundance, community structure and diversity were investigated. A total of 179 taxa belonging to46 genera of diatom were identified. The result showed that the ecotypes of diatom were mostly eurytopic species,next were warm water species and temperate species. The most dominant species were Cyclotella stylorum and Coscinodiscus jonesianus. The seasonal variation of diatom abundance was remarkable. The cell abundance of diatoms was higher in spring(2.974×103cells/g) than autumn(0.071×103cells/g). The number of species varies with change of season, demonstrating the adaptability of diatoms to the temperature of water. The species diversity of benthic diatom was lower in autumn than spring.欧盟第六框架与发展中国家合作项目“海岸带复合系统中的生态海水养殖研究”(No.INCO-CT-2004-510706);; 国家自然科学基金(No.41476116

Preliminary study on dinoflagellate cysts in sediment of Xiamen Harbor

描述了厦门湾沉积物中的13种甲藻孢囊的形态与丰度、分布特征。初步研究结果表明,厦门湾沉积物中甲藻孢囊的平均丰度为3360粒·kg-1湿重;其中有2种有毒甲藻:塔玛亚历山大藻和小型亚历山大藻,有2种有害甲藻:具刺膝沟藻和锥状斯氏藻的孢囊,且数量较为丰富。这4种有害有毒甲藻孢囊在环境条件适合时将可能引发赤潮,对厦门湾水产养殖和人体健康产生危害。This article reports the morphology, densities and distribution characteristic of 13 dinoflagellate resting cysts in sediment of Xiamen Harbor. The preliminary study showed that the average abundance of dinoflagellate cysts is 3360 ind·kg-1(wet sediment). Among them 2 species are toxic (Alexandrium tamarenes, A. minutum) and 2 species are harmful (Gonyaulax spinifera,Scrippsiella trochoide). These 4 toxic and harmful dinoflagellate cysts are rich in the sediments of Xiamen Harbor. They will be harmful to the aquaculture in Xiamen Harbor and human health when the environmental factors are appropriate.福建省重大自然科学基金资助项目(2001F001

象山港潮间带底栖硅藻的分布及其与环境关系探讨

于2005年5月和11月对浙江省象山港潮间带底栖硅藻进行采样调查,分析了底栖硅藻的种类组成、丰度、优势种、多样性及群落结构的季节变化和平面分布特征.并讨论了底栖硅藻与水温、营养盐、潮汐等环境因子之间的关系.共鉴定硅藻33属124种.硅藻数量分布随季节变化明显,春季细胞丰度高于秋季.主要优势种为柱状小环藻(Cyclotella stylorum),春、秋季平均占总细胞数的25.8%.种类的季节变化反应硅藻对水温的适应性,潮汐、盐度、pH值对底栖硅藻组成影响并不明显.秋季营养元素含量升高,多样性指数降低

Diatom assemblages in surface sediments from the South China Sea as environmental indicators

We studied diatom distribution from 62 samples from the uppermost 1 cm of sediment in the South China Sea (SCS), using grabs or box corers in three cruises between 2001-2007. Fifty six genera, 256 species and their varieties were identified. Dominating species included Coscinodiscus africanus, Coscinodiscus nodulifer, Cyclotella stylorum, Hemidiscus cuneiformis, Melosira sulcata, Nitzschia marina, Roperia tesselata, Thalassionema nitzschioides, Thalassiosira excentrica, and Thalassiothrix longissima. Most surface sediments in the SCS were rich in diatoms, except for a few coarse samples. Average diatom abundance in the study area was 104 607 valve/g. In terms of the abundance, ecology, and spatial distribution, seven diatom zones (Zones 1-7) were recognized. Zone 1 (northern continental shelf) is affected by warm currents, SCS northern branch of the Kuroshio, and northern coastal currents; Zone 2 (northwestern continental shelf) is affected by intense coastal currents; Zone 3 (Xisha Islands sea area) is a bat..

First record of genera Rutilaria and Trigonium(Bacillariophyta) and 11 diatom taxa(species and varieties) in South China Sea

Diatom taxa in samples collected from the uppermost 1-cm sediment of the South China Sea(SCS) during cruises in 2000,2001,and 2007 were investigated.Among them,two genera,Rutilaria and Trigonium,and 11 marine taxa(species and varieties) were described for the first time in China.The 11 taxa,Rutilaria radiata,Asterolampra grevillei,Biddulphia turrigera,Cocconeis cyclophora var.decora,Cocconeis ocellata,Dictyoneis marginata,Entogonia davyana,Tryblionella campechiana,Plagiogramma kinkeri,Plagiogramma nankoorense and Trigonium cf.contumax,were mainly extant species,although Rutilaria radiata and Entogonia davyana are fossils.Available data show that these species are mainly present in the eastern and western Pacific Ocean and the Indian Ocean.A large number of taxa newly recorded in this study were previously reported in the Philippines.The presence of these taxa in both locations is likely a result of seawater exchange in the SCS through the Bashi Channel.Taxonomic descriptions,habitats,and distributions of each..

Late Quaternary diatom remains in South China Sea and their geological signiFicance Ⅷ.Discussion on some problems

本文根据分析结果阐述了两种不同样品处理方法所获得的硅藻丰度和微型硅藻的人主要种类和相对百分含量。研究表明洗涤富集法所获得的硅藻丰度存在较大误差；微型硅藻的含量普遍介于10%~20%之间，最高可达42.31%，最低为5.66%，并指出了在微型硅藻相对含量大于20%的样品中，其主要种类为具槽直链藻和条纹小环藻等沿岸底栖种，并成群体产出。最后指出了伯戈根管藻和短刺角毛藻在三柱样剖面中的数量分布与晚第四纪的气候冷暖更替无密切联系。Diatom abundance and the main micro-diatom species and relative percentage content obtained aFter two diFFerent sample treatment methods are summarily described based on the analyzed results of late Quaternary sediments From the South China Sea.our studies indicate that the washing-enrichment method introduces more error of diatom abundance.The content of micro-diatom is commonly between 10%～20% with the highest of 42.31 % and the lowest of 5.66%.In the samples with relative content of micro-diatom more than 20%, the main species are coastal benthic species such as Melosira sulcata and Cyclotella striata and mostly occur as colonies.At last,it is shown that there is no close relationship between the content distribution of Rhizosolenia bergonii and Chaetoceros messanensis in the three cores studied and climatic cold-warm alternation in late Quaternary.国家自然科学基金!4917627

Late Quaternary diatom remains in South China Sea and their geological signiFicance Ⅵ. Notes on new species and new records of diatoms

本文记述了南海晚第四纪沉积物中发现的两个新种[线形辐环藻（ACTInOCyCluSlInEATuSlIuCHEngETlAnSPnOV.）、星圆筛藻（COSInOdISCuSASTEr-AEuSCHEng，lIuETlAnSP.nOV，）]以及在我国首次记录的国筛藻的7个种。In the study of diatoms collected From three sediment cores of Late Quaternary in SouthChina Sea,two new species of Actinocyclus Rhr.and Coscinodiscus Eh.- and 7 new records ofCoscinodiscus Rhr.were Found.国家自然科学基金!4917626

Late Quaternary diatom remains From South China Sea and their geological signiFicance Ⅴ. Diatom Genus Liriogramma Kolbe

硅藻门（bACIllArIOPHyTA）沟纹藻属（lIrIOgrAMMAkOlbE）在我国是1个新记录的属。该属最先由kOlbE（1954）在西太平洋赤道区（2°52＇S，89°50＇W，水深3225M）的柱状样沉积物中找到1种，订名l.PETTErSSOnII。之后，又在1955年从大西洋（0°7＇n，18°12＇E；0°8＇n，16°19＇E）和太平洋（6°44＇n，129°28＇W；2°52＇S，89°5＇W）的柱状样沉积物中找到另1种，订名l.HuSTEdTII。笔者在南海第四纪的一个柱状样，距今约120kA（晚更新世）至11kA（全新世）的沉积物里找到了迄今该属已记录的2个种。此外，还记录了新组合的种：lIrIOgrAMMASArCOPHAgu（WAllICH）nOV.COMb.Liriogramma Kolbe (Bacillariophyta ) is a new record of diatom genera in China.The genus was First described by Kolbe (1954) with the species L.petterssonii in sediment cores From the West PaciFic Ocean (2°52'S, 89°50' W, depth: 3 22.5m ).In 1955, another species L.hustedtii was Found in the sediment cores From the Atlantic Ocean (0°7' N, 18°12' E; 0°8' N, 16°19' E) and the PaciFic Ocean (6°44' N, 1 29°28' W; 2°52'S, 8°95'W ).We Found the above two species in a Quaternary sediment core From the South China Sea, which ranged From about 1 20ka ago (Late Pleistocene ) to 11ka ago (Holocene ), Anew combination L.sarcophagus (Wallich) nov.comb.is described in the present paper.国家自然科学基金!4917626

Late Quaternary sedimentary diatom from East China Sea continental shelf and its paleoceanographical significance

本文对东海陆架DG961 7岩芯沉积硅藻进行了研究 ,共分析鉴定出 97种和变种 ,有近 1 0种硅藻在岩芯中连续分布 ,且有较高的含量 ,而其余种类含量极低 ,仅零星检出 .根据该岩芯中产出硅藻种类、含量及硅藻丰度变化特征自下而上共划分出 3个硅藻组合带及 5个亚带 .结合孢粉资料 ,对产出 3个不同硅藻带岩芯的地层年代进行了对比研究 ,表明该岩芯所代表的地层年代为中 晚全新世 ,硅藻Ⅰ组合带大致为大西洋期的沉积 ,硅藻Ⅱ组合带应为亚北方期的产物 ,而硅藻Ⅲ组合带与亚大西洋期对应 .文中并对不同硅藻组合带产出时的古海洋环境进行了初步探讨 .Sedimentary diatoms of core DG9617 from the continental shelf of the East China Sea are studied in this paper. 97 diatom species and varieties are identified, among them nearly 10 diatom species distribute continuously in the core with higher relative contents, but others distribute scatteredly with very lower relative contents. 3 assemblage zones and 5 assemblage sub-zones are subdivided based on the characteristics of the species composition, the relative contents and the abundance of the sedimentary diatoms. Stratichronology study of these 3 diatom assemblage zones combining to the analysis data of palynology from the same core suggests that the age of the core belongs to middle and late Holocene. The first diatom assemblage zone represents the sediment of Atlantic Period, the second of the Sub-boreal Period and the third of the Sub-Atlantic Period. The paleoceanographical environment of the East China Sea continental shelf in late Quaternary is also discussed according to the characteristics of diatom assemblage zones.国家自然科学基金资助项目 (4 9976 0 19