青海东昆仑乌兰乌珠尔铜矿金属矿物特征及意义

通过详细的光、薄片研究,认为乌兰乌珠尔铜矿主要金属矿物有黄铁矿、黄铜矿、磁铁矿、磁黄铁矿、毒砂、闪锌矿、黑钨矿和锡石等.进一步通过金属矿物组合及其成分分析和流体包裹研究,推断乌兰乌珠尔铜矿的金属矿物主要是在高硫逸度较还原环境下形成的,其形成作用可划分为锡石-多金属和黄铜矿-多金属两个成矿阶段.结合乌兰乌珠尔区域地质和矿床地质的研究,确定该矿床为中高温热液Cu矿床.     

胶州湾鱼卵、仔鱼和稚鱼的分布

2003年1月-2004年1月在胶州湾海域逐月进行连续13个航次的调查,对胶州湾鱼卵、仔鱼和稚鱼的种类组成、丰度和主要种类的分布进行了研究。结果表明,采集到的鱼卵均为浮性鱼卵。鱼卵丰度最高值出现在8月(5.02粒/m3),次之为5月(4.97粒/m3)。共采集到仔、稚鱼10种,隶属9科10属,优势种为刺鱼叚虎鱼、斑鱼祭和玉筋鱼。根据出现的季节和出现时间的长短,将仔、稚鱼分为暖季类群、暖季短时类群和冷季类群三种类群。暖季类群较冷季类群占有明显的优势。暖季短时类群的种数、丰度和站位出现率都比较低。仔、稚鱼的丰度、种数的季节变化显著,最大值均出现在6月份,丰度是16.34尾/m3,种数为7种,与海水月平均温度的季节变化节律基本一致。     

The Larval Fish Assemblage in Nearshore Coastal Waters off the St Lucia Estuary, South Africa

This paper reports on the composition, abundance and distribution of the larval fish assemblage in the nearshore coastal waters off the St Lucia Estuary mouth, South Africa. Ichthyoplankton samples were collected over a 12 month period from five stations located along a transect up to 2·5 km offshore, and from two stations north and south of the estuary mouth, respectively. In all, 6126 fish larvae, representing 89 families and 186 species, were collected. Larvae in the families Myctophidae and Tripterygiidae comprised 21% and 16% of the total catch, respectively. The most abundant species were an unidentified triplefin, Tripterygiid 1 and the lanternfish Benthosema fibulatum, together which contributed nearly 18% of the total catch. Larvae of marine spawners independent of estuaries dominated the catch both in terms of density (90%) and in terms of number of taxa (89%). Some larvae of estuarine-associated species were present, in addition to a few specimens of estuarine resident species. Overall the dominant environmental variable affecting larval densities was temperature, particularly for Trypterygiid 1 where temperature contributed to 9% of the variance model. Densities of fish larvae peaked in November and December 1990 (late spring and early summer) and were lowest from January to June 1991 (summer, autumn an early winter). Different taxa dominated the catch each month with reef- and shelf-associated species accounting for the peak in August and September 1990, oceanic species in November 1990 and a mixture of the two groups in December. Overall larval densities were significantly higher in bottom samples with a trend of increasing densities offshore for reef and shelf taxa. The larvae of reef and shore taxa were predominantly preflexion larvae, whilst the few estuarine spawner species that were collected were mainly postflexion. Ontogenetic patterns related to depth and distance offshore were evident for the dominant species in each estuarine-association category.The present study has shown that temporal and spatial variations in the larval fish assemblage off St Lucia are related to environmental conditions and ontogenetic behavioural patterns of certain species. The origin of many of the larvae in the assemblages off the coast of St Lucia is probably from both local spawning populations in the shelf waters off KwaZulu-Natal and spawning populations farther north in shelf waters off Mozambique. Additional studies with more detailed oceanographic measurements will further our understanding of the physical processes that supply larvae to the St Lucia region.     

对中国第四系中统划分方案的回顾与讨论

国内地层规范中规定第四系划分为两个统,即全新统和更新统,后者又分为下、中、上３个阶。这３个阶大部分第四纪地质工作者习惯称为下、中、上更新统。本文仍暂用此名。下、中更新统的界线一般以Ｂ／Ｍ为界,年龄为０．７８ＭａＢ．Ｐ,但从泥河湾组、午城组顶界看,可能要到１００～１．２０ＭａＢ．Ｐ．;中、上更新统界线,一般以０．１２８ＭａＢ,Ｐ为界,代表末次冰期的开始,但从黄土高原Ｓ１底界、萨拉乌苏组底界和小渡口组顶界看,其年龄为０．１２８ＭａＢ,Ｐ,或０．１４ＭａＢ Ｐ或０．２０ＭａＢ,Ｐ．;上更新统与全新统的界线,其年龄基本上集中在０．０１０～０．０１１ＭａＢ,Ｐ,代表冰期结束,温暖期开始。     

Experimental studies on dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) production by four marine microalgae

The production of dimethylsulfide (DMS) and dimethylsulfoniopropionate (DMSP) by marine microalgae was investigated to elucidate more on the role of marine phytoplankton in ocean-atmosphere interactions in the global biogeochemical sulfur cycle.Axenic laboratory cultures of four marine microalgae–Isochrysis galbana 8701,Pavlova viridis,Platymonas sp.and Chlorella were tested for DMSP production and conversion into DMS.Among these four microalgae,Isochrysis galbana 8701 and Pavlova viridis are two species of Haptophyta,while Chlorella and Platymonas sp.belong to Chlorophyta.The results demonstrate that the four algae can produce various amounts of DMS(P),and their DMS(P) production was species specific.With similar cell size,more DMS was released by Haptophyta than that by Chlorophyta.DMS and dissolved DMSP (DMSPd) concentrations in algal cultures varied significantly during their life cycles.The highest release of DMS appeared in the senescent period for all the four algae.Variations in DMSP concentrations were in strong compliance with variations in algal cell densities during the growing period.A highly significant correlation was observed between the DMS and DMSPd concentrations in algal cultures,and there was a time lag for the variation trend of the DMS concentrations as compared with that of the DMSPd.The consistency of variation patterns of DMS and DMSPd implies that the DMSPd produced by phytoplankton cells has a marked effect on the production of DMS.In the present study,the authors’ results specify the significant contribution of the marine phytoplankton to DMS(P) production and the importance of biological control of DMS concentrations in oceanic water.     

基于Oracle的国土资源基础数据组织方法

鲁西地区中生代有2个岩浆活动时期,中侏罗世岩浆活动规模较小,形成铜石杂岩体,锆石SHRIMP U Pb年龄167.9-183Ma,加权平均值为（175.7±3.8）Ma;早白垩世岩浆活动范围较广,生成多种岩石系列,形成济南—埠村—邹平—淄博金岭一带杂岩体和沂南县铜井、莱芜、蒙阴虎头崖、临朐铁寨等杂岩体,锆石SHRIMP和LA ICP MS U Pb测年结果为128-134Ma。     

星斑川鲽仔、稚、幼鱼的形态发育与生长

为了摸清星斑川鲽仔、稚、幼鱼各期形态发育特征,2006年4-7月在实验室利用显微数码摄像系统,通过电脑显示屏观察、测量、拍摄记录星斑川鲽胚后发育形态变化.培育水温14.0～19.5 ℃,S 27～31,光照度500 lx左右,饵料依次为经过强化的轮虫、卤虫无节幼体和配合饲料.星斑川鲽初孵仔鱼全长1.80～2.08 mm, 1日龄仔鱼平均全长2.89 mm;3日龄开始摄食;5日龄卵黄囊吸收完毕进入后仔鱼期;15～16日龄全长8.84 mm,开始伏底变态进入稚鱼期;20日龄全长10.12 mm,稚鱼右眼完全迁移至左侧,变态完成营底栖生活进入幼鱼期.星斑川鲽仔鱼变态发生日龄与培育水温有关,在12～15 ℃需24～27 d;15～16 ℃需18～20 d;17～19 ℃需15 d.开始变态仔鱼全长9 mm,变态完成时全长11 mm.幼鱼期鳞被形成,基本具有成鱼的外部形态和习性.     

LABORATORY OBSERVATION ON SPAWNING,FECUNDITY AND LARVAL DEVELOPMENT OF AMPHIOXUS (BRANCHIOSTOMA BELCHERI TSINGTAUNESE)

Although amphioxus is widespread in temperate and tropical seas,its population is diminishing be-cause of environmental pollution.To keep the population of this evolutionarily important animal fromdiminishing,study on its reproduction and development is necessary.The main findings in this study onthe spawning and fecundity of the amphioxus reared in laboratory and its larval development are as fol-lows.1.Water temperature markedly affected the spawning.It spawned only when water temperature reached 21℃.2.Spawning of the amphioxus in laboratory was markedly extended.Initially,the amphioxus spawned at about 7:00 PM,but spawning time was postponed as spawning days went on.3.The number of eggs produced by a female ranged from 1400 to 12800,average of 5800.This al-so represents the fecundity of the amphioxus because it shedded all eggs within the ovary at a time.4.During the first few months of life of the amphioxus,its growth rate changed seasonally.Thegrowth rate in summer and fall was greater than that in     

(鱼免)状黄姑鱼早期发育特征及对温盐度的适应性

1996年3~6月采用人工注射LRH-A和HCG诱导状黄姑鱼自然产卵受精,观察6批次胚胎发育的结构特征和1~16日龄仔鱼形态变化及温度、盐度对状黄姑鱼早期发育和存活的影响,为状黄姑鱼大规模人工繁殖和苗种培育提供科学依据。根据其外部形态和胚胎行为的出现将状黄姑鱼胚胎发育划分为17期,3日龄开口;状黄姑鱼受精卵孵化的温度范围为16.3~30℃,最适孵化温度为22~24℃;孵化盐度范围为13.7~53,最适孵化盐度范围为26.9~40.7,其中盐度为7.2时受精卵无法孵化,盐度在40.7以上的受精卵全部为浮性,盐度为26.9以下全部呈沉性;状黄姑鱼仔鱼存活的适合盐度为20.2~33.4,随着仔鱼的生长,对耐盐的适应性也逐渐增强。     

盐沼前缘陡坎韵律性形态特征及其形成过程与机理

盐沼前缘陡坎是潮滩环境中盐沼与粉砂—淤泥质光滩交界处的独特地貌形态,研究其形成过程与机理有助于理解盐沼湿地对潮滩发育及其稳定性的影响。根据江苏中部海岸盐城自然保护区核心岸段互花米草盐沼前缘陡坎形态参数（凹槽长度、凹槽宽度和陡坎高度）的分析,发现不同的形态参数组合对应于不同的陡坎演化阶段。根据陡坎形态特征差异,可将盐沼前缘陡坎韵律性形态发育过程分为三个阶段,而这三阶段的交替旋回过程与近岸波向的季节性变化有关。陡坎处的地貌特征与前缘光滩的沉积物特征表明陡坎形态特征形成与波浪作用有关,且显著的陡坎韵律性形态能够部分地应用边缘波理论来解释。