Morphological and molecular evidence supports the first occurrence of two fishes,Siganus sutor(Valenciennes, 1835)and Seriolina nigrofasciata(Rüppell, 1829)(Actinopterygii:Perciformes), from marine waters of Odisha coast,Bay of Bengal,India

Marine ecosystems provide a wide variety of diverse habitats that frequently promote migration and ecological adaptation. The extent to which the geographic distribution of marine organism has reshaped by human activities remains underappreciated. The limitations intrinsic to morphology-based identification systems have engendered an urgent need for reliable genetic methods that enable the unequivocal recognition of fish species,particularly those that are prone to overexploitation and/or market substitution. In the present study, however, an attempt has been taken to identify two locally adapted fish species, Siganus sutor(Valenciennes, 1835) and Seriolina nigrofasciata(Rüppell, 1829) of order Perciformes, which happens to be the first record in Odisha coast,Bay of Bengal. The diagnostic characteristics of Siganus sutor are: dorsal fin XIII-10, anal fin VII-9, pectoral fin 15,pelvic fin II-3, while that of Seriolina nigrofasciata dorsal fin VI-I-35, anal fin I-17, pectoral fin 16, pelvic fin 5. All COI barcodes generated in this study were matched with reference sequences of expected species, according to morphological identification. Bayesian and likelihood phylogenetic trees were drawn based on DNA barcodes and all the specimens clustered in agreement with their taxonomic classification at the species level. The phylogeographic studies based on haplotype network and migration rates suggest that both the species were not panmitic and the high-frequency population distribution indicates successful migration. The result of this study provides an important validation of the use of DNA barcode sequences for monitoring species diversity and changes within a complex marine ecosystem.     

有机磷农药对鱼类的毒性效应及内分泌扰乱作用

有机磷农药是一类高效、低残留的农药 ,２０世纪８０年代以来被广泛应用于农林业。据华小梅和单正军１９９６统计 ,在过去２０年里，有机磷农药的生产量和使用量急剧增长 ,目前已经成为当今使用最广谱的农药。有机磷农药的使用为农林业的增产丰收立下了汗马功劳 ,但所使用的农药会随雨水冲刷等途径而进入河流、湖泊和海洋 ,造成水体农药污染 ,对水生生物造成威胁。本文综述了国内外有关有机磷农药对海淡水鱼类的毒性及内分泌扰乱作用研究的最新进展。１鱼类对有机磷农药的敏感性农药的分子结构及脂溶性不同 ,导致不同农药对同一种鱼类的毒性…     

海底沉积物分析测试方法标准的研究

依据海底沉积物分析测试方法标准研究的总体设计，完成了40个分析项目的21份验证报告，进行了实验室间精密度协作性检验工作，在海底沉积物CaCo3,H2Os^-，H2O^ 的分析方法研究中取得新进展，并建立了ICP－AES法测定海底沉积物中常量、微量、稀土元素分析方法。     

南海风暴潮对风场和外围海水敏感性研究

为探索来自西北太平洋台风风暴潮与南海局地生成台风风暴潮不同,本研究在假设两种台风气象条件相同情况下,研究随台风而来外围海水所形成增水对南海沿岸的影响。以0814"黑格比"强台风风暴潮为基础,使用ROMS(regional ocean modeling system)模式进行数值模拟并通过设计对比试验方法进行研究,研究发现在台风登陆时引起的增水最大,最大增水出现在台风路径右侧,其中在沿岸区域,外围海水形成增水约占总增水10%,且大约3 h后出现增水回震现象。同时,设计对比试验,研究来自西北太平洋台风风暴潮对台风路径、台风强度、台风移动速度和流入角等气象条件敏感性,并获得与前人一致的结果。     

X荧光光谱仪在实验室-调查船测定海洋沉积物元素的对比研究

运用Epsilon3系列小型能量色散X射线荧光光谱仪,选取水系沉积物、海洋沉积物等标准物质31个,采用压片法制样,建立了该仪器对海洋沉积物中34种元素定量测试的分析方法,该方法检出限低,精密度高,准确性好。在海上调查期间运用该仪器与方法,对深海沉积物样品进行了现场测试,调查船上的测定值与陆上实验室内的测定值基本一致,两者平均相对偏差基本小于10%,结果表明运用该分析方法,Epsilon3系列小型能量色散X射线荧光光谱仪能快速、准确测定沉积物中多种元素,为及时判断现场资源分布情况提供依据,减少取样的盲目性,这将为我国海洋地质调查工作提供新的技术支持。     

太行山—五台山区前寒武纪变质岩系同位素地质年代学研究

<正> 中国北方河北、山西两省交界地带的太行—五台山区,早前寒武纪变质岩系十分发育,分布面积达20,000平方公里,为华北地块的重要组成部分。在这一地区内,保留了早前寒武纪不同发展阶段的种种地质作用的记录。深入研究其地质历史,将对阐明华北地块的形成和演化具有重要的典型意义。作者正是基于这一目的,在该区进行了同位素地质年代学的研究。     

Study of A Geo-Acoustic Model of Gas-Bearing Sediment and Its Application in Sediment with Low Acoustic Velocity

A new geo-acoustic model for gas-bearing sediment is proposed based on the work of Dvorkin and Prasad, and Biot theory. Only five geophysical parameters: sediment mineral composition, free gas saturation, tortuosity (also known as the structure factor), permeability, and porosity, are considered in the model. A benefit of this model is that we need only five parameters instead of ten parameters in the Biot’s formulas for acoustic velocity and attenuation calculation. Here the model is demonstrated with the in-situ experimental data collected from the Hangzhou Bay, China. The results of this study suggest that free gas content in sediment is the most critical condition resulting in a low acoustic velocity (compressional wave). The respective contributions of the other four parameters in the model are also discussed.     

小城镇总体规划编制存在的问题及对策

城乡矛盾历来是我国经济发展的一对主要矛盾,如何协调两者的关系,缩小彼此之间的差距,是各学科长期致力于研究的热点问题。从规划层面而言,小城镇直接面对广大乡村地域空间,是协调城乡关系的最基层衔接点。其意义在于使小城镇总体规划编制的思路与时俱进,克服传统规划编制产生的弊端,使小城镇总体规划编制能够适应现代城乡规划的发展,消除城乡对立与差别,实现城乡相互融合。     

Effect of Dietary Phosphorus on the Growth and Body Components of Juvenile Synechogobius hasta

The effect of dietary phosphorus on the growth and body components of juvenile Synechogobius hasta was determined. Different percentages of dietary phosphorus (0.63, 0.77, 0.93, 1.06, 1.22 and 1.36) were tested by feeding the fish (body weight, 15.81 g ± 0.32 g; 20 individuals each group; 3 groups each percentage) at a surplus of 5%–10% above satiation for 35 d. Dietary phosphorus did not significantly affect the specific growth rate, feed intake, feed conversion ratio and protein efficiency rate. Nitrogen ...