Distribution and number change of the Littorinid(Gastropoda) on intertidal hard bed in the Jiulong Estuary, Fujian Province

-Among four species of Littorinid, Littorina scabra, L. brevicula, Nodiliitorina millegrana and N. pyramidalis pyramidalis, on the hard intertidal zone in the Jiulong Estuary, Fujian, L. scabra has the most extensive distribution both vertically and horizontally, and the highest anual average density. The uppermost limit of vertical distribution of N. pyramidalis pyramidalis is higher than the other three Littorinid. Desiccation is a main factor affecting the uppermost limit of vertical distribution of the Littorinid. The increasing wave action will raise the uppermost limit vertical distribution of Littorinid. With seasonal changes, the densities of the Littorinid also change in different tidal zonations. Difference in salinity is the main factor affecting the horizontal distribution of the Littorinid in the estuary.     

青蛤软体部重量和生化组分含量的季节变化

本文研究青蛤Cyclina sinensis软体部重量和三种生化组分含量的季节变化。结果表明:6-9月,随着性腺的发育,青蛤标准动物(壳长34mm±0.4)软体部干重、蛋白质和脂类含量逐渐增大。8月,软体部干重和含脂量达一年中最高值,雌、雄个体含脂量分别为75.7mg和74.6mg。而软体部蛋白质含量最高值出现在产卵前的9月份,雌、雄个体蛋白质含量分别为226.6mg和303.7mg。雌性个体碳水化合物含量在这期间无显著变化,雄性个体则升高。从10月上旬开始,随着配子的排放,软体部干重、蛋白质、脂类和碳水化合物含量急剧下降至一年最低值。11月后又逐渐恢复至初春水平。软体部碳水化合物含量在12—1月较高,出现一年的第二个高峰。作者认为,碳水化合物是冬季青蛤代谢的主要能源。     

黑鲷音响驯化初步试验

利用音响对鱼进行驯化,在国内是一个新课题,但在国外早已开展了这方面的工作,其研究鱼类听觉的结果表明,大多数鱼对低频声感觉较敏感。鲷科的可听音域为36—1250Hz其中真鲷在低频段的最高敏感频率为200Hz而线笛鲷在低频段的最高敏感频率为400—600Hz。本试验采用低频段的100—600Hz的纯音对黑鲷做了音响驯化试验。试图从中找出黑鲷对音响反应的频率范围、音响驯化的音敏频率和记忆时间等有关要素。     

Representation of double-peaked sea wave spectra in Jiaozhou Bay

The spectrum shape characteristics of double-peaked sea wave spectia actually measured in the Jiaozhou Bay were analysed and one representation of double-peaked sea wave spectra with six-parameters which can be determined from a given sea wave spectrum is proposed in this paper. After verifying by fitting process with the data sets of double-peaked sea wave spectra measured in the Jiaozhou Bay, it can be seen from the results that the representation mentioned above may be used to express the double-peaked sea wave spectra generated in the Jiaozhou Bay under various sea states, and that the absolute values of maximum deviation index (D.I.) do not exceed 30. 0.     

The relationship between tidal current field and sediment transport in the Huanghai Sea and the Bohai Sea

-Based on a two-dimensional numerical M2 tidal model of the Huanghai and Bohai Seas, sediment transport of particles with different sizes in the computational area is given. It is concluded that tidal currents play an important role in sediment transport and deposition in the Huanghai and Bohai Seas.     

色光条件下黄鳍鯛幼鱼视觉运动反应

本文研究了在6种波长单色光的5个等级光照度水平下黄鳍■幼鱼视觉运动反应率与光照度和刺激频率的关系,临界反应频率与光照度和光波长的关系,给出了各波长色光不同照度下的反应潜伏期及不同屏幕速度下的跟随角速度和跟随率。     

催化极谱法测定海水中的硒

一、前言 海水中的硒主要以可溶性无机硒和有机硒形式存在。无机硒有Se~(2-)、SeO_3~(2-)和SeO_~(2-)三种形态,其中以SeO_3~(2-)和SeO_4~(2-)为主。有机硒主要以二甲基硒化物和二甲基脱硒化物(dimethyl deselenide)的形式存在。一般总硒含量在0.03μg/l—6μg/l范围内,大部分在0.05μg/l—1.00μg/l之间,硒(Ⅳ)与硒(Ⅵ)的含量大致相同。但不同海域海水的硒     

海浪谱模拟

本文的主要内容是:(1)对文献[1]的海浪模型的改进。(2)讨论如何利用已经得到的对应于某靶谱的信号谱,以得到新的所要求的靶谱对应的信号谱.     

中国东部沿海第四纪古环境的探讨 Ⅰ.试论“生物环境容忍带”与生物气候界线

本文提出“生物环境容忍带”概念,讨论生物对气候环境的适应性和一定条件下的容忍性,以此为据,论证了中国东部沿海23000年以来的生物气候界线、冰缘外围环境和气候环境变迁轮廓。     

南海东北部海区碳酸钙的饱和面、溶跃面和补偿深度

南海东北部碳酸钙地球化学研究得出:上层海水中方解石饱和度450—550％,文石饱和度250—350％.300m以深下层海水方解石与文石饱和度和深度的对数直线相关.深层水中二氧化碳含量0.03mmo1·dm~-3,碳酸根含量0.094mmol·dm~(-3),碳酸氢根含量2.35mmol·dm~(-3)总二氧化碳2.48mmo1·dm~(-3);方解石的饱和面1630m,溶跃面3000m,补偿深度4600m,文石饱和面435m,补偿深度1000m.