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211.
A study on zooplankton distribution patterns and indicator species in Kuroshio upstream area and adjacent East China Sea 总被引:3,自引:0,他引:3
On the basis of the data of zooplankton biomass and three major taxa—— Copepoda, Chaetognatha andSiphonophora of May-June 1986, July-August and December 1987, the distributional patterns and the indicator species of zooplankton in the Kuroshio and adjacent waters of the East China Sea are preliminarily studied. The results are as follows:The horizontal distribution of zooplankton biomass and the abundance of copepods, chaetognaths and siphonophores arecurred in the continent area northwest of Taiwan and the south-centre section of the East China Sea continent, which are the mix front of different waters. Zooplankton in the water area inside of Ryukyu Islands presented low abundance and high diversity. There are clear seasonal variations in zooplankton biomass and abundance in the study area. The strength or weakness of different water masses and fronts is the basic reason for the variations of zooplankton biomass and abundance.The species composition of zooplankton in the study area is complex and var 相似文献
212.
中国对虾体内20-羟基蜕皮酮含量与生长和性腺发育的关系 总被引:3,自引:0,他引:3
应用放射免疫分析法对完成变态后的中国对虾(Penaeus orientalis)体内20-羟基蜕皮酮(20-HE)含量进行了周年测定。5~6月,全虾抽提液中20-HE的质量分数以体长为0.8cm的仔虾为最高(47.96±3.94)×10~(-9)(m/m)。血淋巴中20-HE的质量浓度在6~8月(平均为22.66ng/mL)和11月(25.93±3.44ng/mL)较高,翌年3月最低,为8.29±1.40ng/mL。呈现出20-HE含量与蜕皮生长和促进卵母细胞早期发育及精子发生有关。 相似文献
213.
Wave-Current Forces on Slender Circular Cylinders 总被引:3,自引:0,他引:3
Li Yucheng Wang Fenglong Kang Haigui Professor Dalian University of Technology Dalian Senior Engineer Dalian University of Technology Dalian Lecturer Dalian University of Technology Dalian 《中国海洋工程》1991,(3)
- A series model tests of wave forces by both regular and irregular waves combined with currents on single piles and bipiles in tandem and parallel arrays have been carried out. Based on Morison Equation, linear wave theory and linear wave spectrum theory as well, the characteristics of inline, lift and resultant forces on cylinders have been analyzed respectively. The drag, inertia and lift coefficients CD, CM and CL f皉 single piles related to KC number and the grouping effect coefficients of inline, lift and resultant forces on bipiles in tandem and parallel arrays related to KC number are given in this paper. 相似文献
214.
南海囊糠虾亚科的初步研究 总被引:1,自引:0,他引:1
囊糠虾亚科Gastrosaccinae 包括的种数并不很多,但有些种数量相当大,是经济鱼虾的天然饵料,在海洋食物链中占较重要的地位。例如黄海的漂浮囊糠虾Gastrosaccus pelagicus Ii 数量很大,普遍发现于底层鱼类胃含物中;此种及其他一些量大的种又可用作养殖鱼虾的饵料。这一亚科迄今已知共7属69种。本文根据中国科学院海洋研究所1958-60年在南海北部所采的底层浮游生物标本和中国科学院南海海洋研究所1974-81年采自西沙群岛、中沙群岛的标本写成,共发现4属12种,其中6种为中国近海的首次记录。 相似文献
215.
The colony-forming Phaeocystis species are causative agents of dense bloom occurrences in coastal waters worldwide. It is difficult to separate them because of the different morphologies associated with their colonial stages. In this study we applied molecular approaches to analyze the genetic variation of Phaeocystis globosa and Phaeocystis pouchetii from several geographic regions, and to assist in tracing the dispersal of bloom-forming Phaeocystis species in coastal waters of China. The sequences of the internal transcribed spacers (ITS1 and ITS2) of rDNA and the 5.8S ribosomal RNA gene of Phaeocystis strains were determined. Sequence comparison shows that P.globosa was the most divergent to P. pouchetii, exhibiting sequence divergence higher than 0.08. However, lower genetic divergences existed between strains of P.globosa. The sequence comparison of the Phaeocystis rDNA ITS clearly shows that the species isolated from the southeast coast of China is identified as P.globosa rather than P. cf. pouchetii or other species. Furthermore, the significance of rDNA variation in distinct global populations of P.globosa suggested it might have had sufficient time to accumulate detectable mutations at the rDNA locus, supporting the hypothesis of ancient dispersal of P.globosa to many areas, meaning that P.globosa blooms in the coastal waters of China are endemic rather than a newly introduced species or a foreign source. Finally, based on the high divergent region of rDNA ITS, a pair of species-specific primers for P.globosa were designed, they could be useful to detect the presence of this species in mixed plankton assemblages or flagellate stages that are recognized with diffculties by means of conventional microscopy. 相似文献
216.
青岛市大气污染时间序列分析预报方法研究 总被引:5,自引:0,他引:5
根据青岛市大气污染监测资料 ,采用时间序列分析方法 ,建立多种预报模型 ,有原序列周期外延法、均生函数周期外延法、均生函数逐步回归法以及自回归预报法等 ,最后提出一种综合预报模型。连续预报试验表明 ,综合预报模型优于任何个别预报模型 ,有较好的预报能力。利用马尔可夫概型对污染状态 (轻、中、重 )进行了分级预报试验 ,也获得良好的效果。 相似文献
217.
218.
关于波浪Boussinesq方程的研究 总被引:2,自引:0,他引:2
对有关波浪 Boussinesq方程的研究成果进行了系统的归纳总结和评述 ,以期对本学科的发展起到一定的引导和促进作用 相似文献
219.
220.
AbstractBased on hydrological data obtained during the 7th to 9th Chinese National Arctic Research Expeditions in the summers of 2016–2018, the main water structure on the shelf of the northern Bering Sea and the volume and heat fluxes of the Bering Strait throughflow were analyzed. Distinct variability was identified in the three Pacific water masses feeding the strait - Anadyr Water (AW), Bering Shelf Water (BSW) and Alaskan coastal water (ACW). Overall, the temperature and salinity of the entire section increased each year, with 2018 showing significant anomalies, i.e., a temperature anomaly of up to 1?°C and a maximum salinity anomaly of 2. From 2016 to 2018, the extent of the ACW gradually narrowed in the eastern part of this section, while the AW expanded eastward each year. The net volume transport through each of the three sections increased poleward from 1.65?Sv to 2.76?Sv, with the AW increasing from 0?Sv to 1.03?Sv, the BSW varying between 0.52–1.65?Sv, and the ACW gradually decreasing from 1.04?Sv to disappearing completely. The net heat fluxes were also poleward, varying between 25.77 TW and 61.50 TW, and showing a significant increase. Significant variations in magnitude and extent were observed in each water mass of the Bering Strait throughflow, which could produce widespread effects in the Arctic Ocean and the global ocean beyond. 相似文献