三倍体合浦珠母贝不育性研究     

何毛贤  林岳光  姜卫国 《热带海洋学报》1996,(2)

对三倍体合浦珠母贝Ｐｉｎｃｔａｄａｍａｒｔｅｎｓｉｉ（Ｄ．）春、秋两繁殖盛期的生殖腺进行了组织学观察，并对其配子形成及受精、发育进行了研究。结果表明：合浦珠母贝三倍体的生殖腺发育差，生殖细胞数量少，极少个体能见到成熟卵母细胞和精子；三倍体的配子能完成受精作用，能发育至直线铰合期。配子多为非整倍体，其染色体数目多为１４—２８，胚胎染色体数目主要为２８—４２，故胚胎不能正常发育。因此，三倍体合浦珠母贝是不育的．  相似文献   

黄河三角洲沿岸及邻近海区细粒沉积物中的碳酸盐   总被引：4，自引：0，他引：4  

何良彪 《海洋科学》1991,15(3):41-45

本文用X-射线衍射法直接计算了来自黄河三角洲沿岸及邻近海区80个沉积样的细粒组分(<2μm)中的碳酸盐含量。计算结果与全样的容量法分析结果基本一致。研究结果表明,本区细粒沉积物中碳酸盐含量变化受沉积物来源、海区水动力作用、海底地貌特征和碳酸盐的地球化学行为等因素所影响。  相似文献   

贻贝育苗中不同饵料的饲养效果比较     

张福绥  马江虎  何义朝  李淑英  刘祥生  于硕恩 《海洋科学集刊》1985,(25):91-102

培育双壳类软体动物幼苗所需的饵料，是指池内培育阶段适合于幼虫和幼苗(壳长一般在1mm以下)的饵料。育苗成功的关键问题之一为是否已经选择到这样的饵料。自40年代找到适宜的饵料生物以后，双壳类幼虫的培养才取得较明显的成效。以往利用过的一些饵料生物巳有文献系统记载。我国贻贝人工育苗是在分离与培养出扁藻以后才获得成功的。随着研究工作的深入以及适应各种不同情况的需要，采用的饵料种类越来越多样化。从生产性育苗特别是多茬育苗考虑，必须因地制宜地筛选出一定种数的饵料，以便在不同培养条件下有机动选择的余地。同一时还应找出适宜的投饵数量，以求取得较好的育苗效果。为此目的，我们于1975-1978年结合生产性育苗的需要进行了一些饵料饲养实验。本文根据实验结果以及多年来生产性育苗的实践，对贻贝育苗的饵料问题进行总结，侧重于不同饵料的饲养效果比较。  相似文献   

Study of zooplankton ecology in Zhejiang coastal upwelling system-Zooplankton biomass and abundance of major groups   总被引：1，自引：0，他引：1  

He Dehu  Yang Guanming  Fang Shaojin  Shen Weilin  Liu Hongbin  Gao Aigen  Huang Shuxin 《海洋学报(英文版)》1988,7(4):607-620

The studied area is a shallow water area that belongs to the East China Sea continent shelf. The distribution of zooplankton biomass is higher inshore than offshore. The maximum abundance is in the inshore edge of the centre of upwelling, which is the superposed area of the salinity front and temperature front, due to the fact that the mixture of three different waters has brought about a concentration of nutrients. The herbivorous Euphausia, Copepoda and Tunicata are the major groups of the abundant area. Tunicata possess the possibility to compete against other kinds of herbivorous zooplankton. This means that there is negative correlation between the distribution of Tunicata and that of Copepoda and Euphausia. The positions of maximum areas of zooplankton biomass, phytoplankton individual and the concentration of phosphates and chlorophyll-a overlap one another. In the centre of upwelling, zooplankton can not adapt itself to the environment of lower temperature and less oxygen even with rich nutrient  相似文献   

大窑湾海域水化要素分布及相关关系的探讨     

邵秘华  孙茜  贺广凯  张国光  刘彤 《海洋科学进展》1995,(2)

本文依据大窑湾的环境调查资料为基础，系统地阐述了水体中化学要素ｐＨ、盐度、透明度、ＤＯ、ＣＯＤ、ＴＯＣ、浊度、悬浮物、ＮＨ４－Ｎ、ＮＯ２－Ｎ、ＮＯ３－Ｎ、ＰＯ４－Ｐ、ＳｉＯ３－Ｓｉ、Ｃｕ、Ｐｂ、Ｚｎ、Ｃｄ、Ａｓ、Ｈｇ、Ｃｒ、硫化物、六六六、石油等分布规律。诸要素主要是在潮流水动力支配下，形成扩散带。各要素中仅有无机氮和ＰＯ４－Ｐ两项含量超标，其余要素含量范围都是处于海水正常浓度水平，属于一类海水水质。文章并对各要素进行相关关系分析。  相似文献   

Mutagenetic action of ethyl methanesulfonate on Spirulina platensis     

Zhang Xuecheng  He Lirong  Dang Hongyue  Tan Guiying 《海洋学报(英文版)》1991,10(4):625-627

In the present experiments, ethyl methanesulfonate (EMS) is used to treat blue-green alga Spirulina platensis. Results show that the chemical is a very effective mutagen on the species and some genetic changes, including morphological variation, different growth rate and greater resistance to low temperature, have been found, which may offer an efficient method for the strain breeding of Spirulina platensis.  相似文献   

九龙江口外浯屿海域底栖生物种类组成与数量分布     

何明海 《台湾海峡》1996,15(4):368-375

本文根据１９９５年的调查，报道了九龙江口外浯屿海域底栖生物的种类组成与数量分布。结果表明，本区底栖生物种类较丰富，组成以多毛类，甲动物，软体动物和棘皮动物为主。底栖生物数量较大，平均栖息密度为３００个／ｍ＾２，平均生物量为３１．０３ｇ／ｍ＾３，数量分布较不均匀。．  相似文献   

Wave-Current Forces on Small Square Cylinders (Part I)     

Li Yucheng  He Ming Professor  Dalian University of Technology  Dalian Former master student  Dalian University of Technology  Dalian 《中国海洋工程》1994,(3)

-Based on the extended Morison Equation and model tests, the in-line forces on small square cylinders caused by waves (regular and irregular) and currents are analyzed in detail in this paper. The hydrodynamic coefficient CD and Cu related to KC number and the effect of direction of wave incidence are also given, which can be used in engineering practice.  相似文献   

闽南：台湾浅滩渔场变性水团的初步分析     

何发祥 《海洋湖沼通报》1994,(3):18-25

根据聚类方法，对闽南－台湾浅滩渔场变性水团进行划分，本海区共有６个变性水团。讨论各个变性水团在不同季节消长变化规律。  相似文献   

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  

He Dehu  Wang Chunsheng  Liu Hongbin  Yang Guanming 《海洋学报(英文版)》1992,11(2):237-254

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