Atlas of Japan (East) Sea hydrographic properties in summer, 1999

Hydrographic properties from CTD and discrete bottle sample profiles covering the Japan (East) Sea in summer, 1999, are presented in vertical sections, maps at standard depths, maps on isopycnal surfaces, and as property–property distributions. This data set covers most of the Sea with the exception of the western boundary region and northern Tatar Strait, and includes nutrients, pH, alkalinity, and chlorofluorocarbons, as well as the usual temperature, salinity, and oxygen observations.     

Preliminary optical classification of lakes and coastal waters in Estonia and south Finland

A preliminary optical classification of lakes in Estonia and south Finland which can also be used for small bays of the Baltic Sea is elaborated. The classification is based on the optical properties of water (diffuse attenuation coefficient, diffuse reflectance) and parameters that are routinely monitored in water bodies (Secchi depth, concentration of chlorophyll-a, total suspended matter and yellow substance). The data complex used for our classification covers different types of water ecosystems (ranging from oligotrophic to hypertrophic) and the variability of water constituent concentrations in the ice-free period in Estonia and south Finland. Using cluster analysis, we found 5 optical classes of waters: clear (C), moderate (M), turbid (T), very turbid (V) and brown (B). There is satisfactory correspondence between class of water, shape of diffuse attenuation coefficient and diffuse reflectance spectra and trophic state of the lakes.     

Outflow of the Intermediate Oyashio Water from Sagami Bay to the Shikoku Basin

Since the Intermediate Oyashio Water (IOW) gradually accumulates in Sagami Bay, it can reasonably be supposed that the IOW also flows out from Sagami Bay, even though it may be altered by mixing with other waters. We have occasionally observed a water less than 34.2 psu with a potential density of 26.8 at the southeastern area off Izu Peninsula in July 1993 by the training vessel Seisui-maru of Mie University. Observational data supplied by the Japan Meteorological Agency and the Kanagawa Prefectural Fisheries Experimental Station show that the IOW of less than 34.1 psu was observed at northern stations of the line PT (KJ) off the Boso Peninsula and to the east of Oshima in the late spring 1993. Based upon these observations, it is concluded that the IOW flows out from Sagami Bay into the Shikoku Basin along southeastern area off the Izu Peninsula. The less saline water (<34.2 psu) was also observed to the west of Miyake-jima during the same cruise, and the westward intrusion of IOW from south of the Boso Peninsula to the Shikoku Basin through the gate area of the Kuroshio path over the Izu Ridge was detected. This event indicated that the IOW branched south of the Boso Peninsula and flowed into Sagami Bay and/or into the gate area over the Izu Ridge. The southward intrusion of IOW into the south of the Boso Peninsula is discussed in relation to the latitudinal location of the main axes of the Kuroshio and the Oyashio. This revised version was published online in July 2006 with corrections to the Cover Date.     

温度、光强和盐度对鹧鸽菜幼体生长发育的影响

从野外采集鹤鸪菜Ｃａｌｏｇｌｏｓｓａｌｅｐｒｉｅｕｒｉｉ（Ｍｏｎｔ．）Ｊ．Ａｇ．幼体，在室内控制条件下，以温、盐、光等不同条件进行模拟培养试验。所获得的数据经生物统计检验表明：鹧鸪菜幼体生长最适水温为２３℃；光照强度为４０００ｌｘ；海水盐度为１８。此结果与我们多年来在汕头港内观察鹧鸪菜的生长及其季节变化相似。     

加州鲈鱼的繁殖习性,早期胚胎发育以及孵化与水温的关系

作者对加州鲈鱼繁殖习性及早期胚胎发育进行了阐述,对受精卵孵化与水温的关系进行了研究。结果表明:加州鲈鱼2龄即达性成熟,3—6月繁殖产卵,水温20℃—24℃时达产卵盛期;雄鱼具有筑巢护卵及护苗等生殖习性;水温17.4℃—19.5℃,平均18.3℃时,受精卵孵化时数为74小时25分钟;在实验温度范围内,孵化时数与水温负相关,而与有效积温正相关。有效积温与平均水温负相关。     

Growth Aspects and Magnesium Carbonate Concentrations of the Reef Building Octocoral Heliopora coerulea (Pallas) after Transplantation

Abstract. An experiment to test C have's hypothesis on temperature dependent MgCO₃ concentrations in marine calcareous skeletons was undertaken by transplanting colonies of Heliopora coerulea. The corals were transferred from a shallow lagoon with high average temperatures to the outer bottom of a fringing reef, 16 m depth, with low average temperatures. Against expectation, a statistically significant increase of average mol % concentrations from 0.48 to 0.54 % for upper growth regions and from 0.49 to 0.62% for lower growth regions was obtained. Temperature records during the experimentation period and the above data indicate that the mol% MgCO₃ concentration in the skeleton of living Heliopora colonies increases when transplanted to an environment with a lower temperature average than that of their original growth site, and with seasonal temperature fluctuations which are smaller in the experimental site than in the control site. Temperature fluctuations at the control site were up to 2.5 times greater than at the experimental site for most of the observation months. This supports the conclusion that the parameters a) minimum temperature and b) temperature stability of the environment are essential for the incorporation of Mg into the carbonate skeleton matrix of marine organisms. Within this study the results of a quantitative chemical analysis of the carbonate skeleton of H. coerulea are presented and growth data of transplanted colonies compared with those from the control site.     

南海晚第四纪硅藻遗体及其地质意义：Ⅷ.几个问题的讨论

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格格不入中，并成群体产出。     

温度对金红色大鳞副泥鳅(Paramisgurnus dabryanus)孵化、仔鱼活力和性别分化的影响

以大鳞副泥鳅(Paramisgurnus dabryanus)新品系“赣红1号”为对象,探究了不同温度(20,23,26,29,32℃)对其受精卵孵化、仔鱼活力和性别分化的影响。结果显示,当温度在20~32℃范围内时,培育周期和孵化周期与温度均呈负相关关系,均随着温度的升高而缩短。培育周期在各温度组间差异显著(P<0.05),孵化周期在29和32℃组间差异不显著,其余各组间均具有显著差异(P<0.05)。随着温度的升高,孵化率先升高后降低,26℃时孵化率达到最高;畸形率呈现与孵化率相反的趋势,26℃时畸形率最低,且显著低于20、29和32℃组(P<0.05);仔鱼的不投饵存活系数(SAI)随着温度的升高而逐渐降低,各组间差异显著(P<0.05),23℃时SAI值为59.77,最大可存活时间为15日龄;此外,雄性率随温度的升高而增加,高温可促进个体趋向雄性发育。研究发现“赣红1号”受精卵孵化、仔鱼活力和性别分化均受到温度的重要影响,结合生产实际和试验数据,其孵化和仔鱼培育的适宜温度应保持在23~26℃。     

江苏海域水环境要素分析——江苏海域环境质量分析之二

在1981、1991（1990）和1998年3次海洋环境调查的基础上，通过相同水质要素时空比较分析，江苏海域的溶解氧、磷酸盐、硝酸盐和亚硝酸 盐这4种主要海水化学因子具有时空变化特征，其高值区主要分布在灌河口、扁担港口、射阳河口、川东港和长江北支口北侧，且河口、近岸值高，向海含量渐小，不同年份、季节也有变化。沿海水化学性质主要受陆源排污（农田化肥等）影响，主要是入海河流携带污染物、海洋生物作用和本海域水体运动特征的影响，此外，溶解氧变化还受到水温变化的影响。