The use of multivariate statistics to resolve multiple contamination signals in the oxygen isotope analysis of biogenic silica          下载免费PDF全文

KATY E. WILSON  MELANIE J. LENG  ANSON W. MACKAY 《第四纪科学杂志》2014,29(7):641-649

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台湾海峡中北部至南麂列岛海域2005年冬季硅藻群落结构特征   总被引：1，自引：0，他引：1  

谢文玲  陈长平  高亚辉 《台湾海峡》2007,26(3):370-379

分析了2005年冬季台湾海峡中北部至南麂列岛海域浮游硅藻的种类组成、分布特点及与环境因子的关系.共鉴定硅藻58属159种(含变种和变型).调查期间正值冬季,种类组成以广温种(占49.69%)为主,其次是暖水种(占18.24%)和温带种(占14.47%).优势种有14种,占总种类数的7.53%.调查海域冬季硅藻群落分布的特点是:硅藻细胞密集区和高值区基本上集中在海峡中线断面上,底层硅藻丰度较表层高.硅藻丰度介于(0.216~7.544)×103个/dm3,总体上,硅藻丰度较低.应用多元逐步回归方法分析表明:影响调查区冬季硅藻平均细胞数量分布的主要因子是硅酸盐浓度.同时,硅藻平均丰度与水温的线性相关性分析表明,硅藻平均丰度的分布与温度呈显著的正相关关系.  相似文献   

南海晚第四纪的硅藻遗体及其地质意义Ⅶ.方格罗氏藻     

程兆第  刘师成等 《台湾海峡》1995,14(2):110-112

方格罗氏藻[Roperia tesselata(Roper)Grunow]的壳面外形和壳缘构造多样，笔者在南海晚第四纪的三个柱状样沉积物中都采到，统计1303个壳体。分析结果表明：在冰期的沉积物中，壳面呈圆形，壳缘平滑无齿状隆起线的壳体占绝对多数；在间冰期的沉积物中，壳面呈卵形，少数近圆形，壳缘具齿状隆起线的壳体明显增多。因此，该种壳面的两类不同形状和构造的数量差异，可应用于探讨南海晚第四纪古气侯旋回。  相似文献   

One Dimensional Ecosystem Model Simulation of the Effects of Vertical Dilution by the Winter Mixing on the Spring Diatom Bloom     

Naoki Yoshie  Yasuhiro Yamanaka  Michio J. Kishi  Hiroaki Saito 《Journal of Oceanography》2003,59(5):563-571

A one-dimensional ecosystem model has been used to investigate the processes relevant to the spring diatom bloom which play important roles in the biogeochemical cycle in the western subarctic Pacific. The model represents the plankton dynamics and the nutrient cycles in the spring diatom bloom; its results show the importance of dilution by deep mixing in winter. It is supposed that the vertically integrated biomass of phytoplankton decreases in the winter due to the decrease of photosynthesis, because the deep mixing transports phytoplankton to a layer with a low light level. However, the observed integrated diatom biomass increases as the mixed layer deepens. This is because the decrease of concentration due to dilution by mixing causes the diatom grazed pressure to be less significant than diatom photosynthesis. In other words, the effect of dilution on the grazed rate is more significant than the effect on the photosynthesis rate because the grazed rate depends on the concentrations of both diatom and grazer, whereas the photosynthesis rate depends only diatom concentration. The average specific diatom grazed rate, defined as grazed rate divided by diatom biomass, decreases by 35% associated with the deepening, while the average specific photosynthesis rate of diatom decreases by 11%. As a result, the average specific net diatom growth rate during the deep mixing is about 70% of its maximum during the spring diatom bloom. The deep mixing significantly affects the amplitude of the spring diatom bloom not only by the supply of nutrients but also by the dilution which drastically decreases the grazed pressure. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Diatom production in the marine environment: implications for larval fish growth and condition   总被引：5，自引：0，他引：5  

St. John  M. A.; Clemmesen  C.; Lund  T.; Koster  T. 《ICES Journal of Marine Science》2001,58(5):1106-1113

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冲绳海槽表层沉积硅藻对黑潮流的响应   总被引：3，自引：1，他引：3  

蓝东兆  方琦  廖连招 《台湾海峡》2002,21(1):1-5

本文报道了冲绳海槽表层沉积物中优势硅藻种的相对含量、热带远洋种和硅藻组合的分布特征 ,讨论了热带远洋种的相对含量与黑潮流、硅藻组合的分布与物质来源的关系等问题 .结果表明 ,热带远洋种的相对含量 >2 0 %的界线与黑潮流的边界基本上一致 ;优势硅藻种和硅藻组合的分布留下了与物质来源的关系较为密切的记录 .  相似文献   

Adaptive Ecology, Growth Strategies and the Global Bloom Expansion of Dinoflagellates   总被引：2，自引：0，他引：2  

Theodore J. Smayda 《Journal of Oceanography》2002,58(2):281-294

Dinoflagellates exhibit unique differences from diatoms in their adaptive ecologies that may be favoring their increasingly successful exploitation of coastal waters and global bloom expansion. Dinoflagellates behave as annual species, bloom soloists, are ecophysiologically diverse and habitat specialists, whereas diatoms behave as perennial species, guild members and are habitat cosmopolites. Diatoms have a relatively uniform bloom strategy based on species-rich pools and exhibit limited habitat specialization. Dinoflagellates have multiple life-form strategies consistent with their diverse habitat specializations, but rely on impoverished bloom species pools. Niche structure and dinoflagellate competition for niche space are considered. The “open niche period” formulated originally for Narragansett Bay is extrapolated as a general bloom paradigm. It is suggested that successful niche occupancy leading to blooms involves adaptive strategies at three heirarchic taxonomic elements: phylogenetic, generic and species-specific, and in that sequence. Transoceanic expatriation of emigrant species leading to indigenous status and blooms requires completion of a three-stage colonization process. Anthropogenic seedings are not, in themselves, bloom stimulation events; they are only the first phase of a multiple-step process. The organismal and niche features required for a hidden flora member to become a bloom species are considered, and the interplay between niche structure, habitat carrying capacity, colonization requirements and stochasticity as factors in the changing global bloom behavior of dinoflagellates discussed. The question is posed whether traditional perspectives of phytoplankton behavior apply completely to dinoflagellates. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   

超声波对条斑紫菜硅藻附着症的作用          下载免费PDF全文

李金波  阎斌伦  秦松  吕作舟 《海洋科学》2007,31(12):1-3

为使条斑紫菜(Porphyra yezoensis)上附着的硅藻脱落,从超声波的生物学效应出发提出了新的思路。选择生长状态较好的附着硅藻的紫菜分别在不同的输出功率和时间下用超声波处理。结果表明,当超声波的输出功率为300 W、处理时间25 s时,可以成功地去除附着的硅藻及黏质柄,而对条斑紫菜未产生不良影响。该研究结果在条斑紫菜的加工生产上有应用与推广价值。  相似文献   

运用数理统计方法研究东海南部陆缘晚第四纪硅藻与环境的关系   总被引：1，自引：0，他引：1  

支崇远  王开发  王洪根  郑玉龙  陶明华 《海洋地质与第四纪地质》2003,23(3):65-72

运用因子分析、对应分析、最优分割、聚类分析等多种数理统计方法，对东海南部陆缘(闽南段)6个柱状剖面的晚第四纪沉积硅藻进行了研究，以代表性的九龙江口ZK2井柱状剖面为例加以详细分析，得出了硅藻组合所反映的生态环境，恢复了该地区的古环境演替过程，即闽南九龙江口晚第四纪以来经历了河流、河口、河口内口、河口外口、河口外缘、河口外缘或海湾、河口内口等古环境演替过程。  相似文献   

盘鲍幼体附着诱导的研究   总被引：8，自引：0，他引：8  

柯才焕  周时强  田越  李复雪  蔡伟铭  蔡福裕  陈延坎 《台湾海峡》2001,20(1):9-14

在水温20.5±0.5℃和海水盐度29.3的条件下，盘鲍幼体在受精后约72h获得附着能力．GABA（γ-氨基丁酸）2～1000μmol/dm3GABA可有效诱导幼体的附着，其中1000μmol/dm  相似文献