太平洋牡蛎人工培育群体的基因型及杂合度研究

实验运用淀粉凝胶电泳的方法检测了１龄养殖太平洋牡蛎Ｃｒａｓｏｓｔｒｅａｇｉｇａｓ５个基因座位上的基因型和杂合度。根据孟德尔自由分离规律,从子代的基因型推断出亲代可能的基因。杂合度的分析表明,人工培育的１龄太平洋牡蛎在Ａａｔ２、Ａｈ１、Ａｈ２、Ｉｄｈ１和Ｌａｐ５个多态位点上的杂合度符合Ｈ－Ｗ平衡规律,未发现明显的杂合子缺失现象。     

热带西太平洋海区生物-光学变异性

在海上测量期间,观测到几次浮游植物大量繁殖过程,每次分别持续8—18d,叶绿素含量分别升高约3—10倍。由于浮游植物大量繁殖,光束衰减系数随叶绿素a含量升高而增大。谱分析的结果表明,光束衰减系数与叶绿素a含量的时间序列有较好的相干性,其相干系数在0．6—1．0之间。在此基础上,讨论了生物-光学变异性与海洋物理过程的关系。结果表明,混合层深度及水温等物理参数的变化是导致生物-光学特性在数十天时域尺度上变化的重要因素。     

东太平洋铁锰结核区微生物的丰度及其成矿作用研究

于１９９４年４－１１月东太平洋铁锰结核期探区,随向阳红０９号船,采集了３９个表层沉积物,１２个上覆水和７个结核样,在现场用平板法测定了异养细菌和铁,锰细菌丰度,用稀释法（ＭＰＮ法）测定硫酸盐还原菌丰度,在实验室对船上带回的异养细菌和锰细菌进一步纯分分离,进行了１２项生化试验,对照伯杰氏手册第八版鉴定至属。为了探讨微生物在大洋成矿过程的作用,使用分光光度法,测定锰细菌对锰,铁离子的转化作用和不同培养     

南极海冰面积变化特性及其与赤道太平洋海表面温度的联系

南极海冰面积变化特性及其与赤道太平洋海表面温度的联系陈锦年,乐肯堂,于康玲,张彦臣（中国科学院海洋研究所,青岛２６６０７１）（青岛海洋大学,青岛２６６００３）关键词南极海冰面积,赤道太平洋海表面温度,厄尔尼诺１引言８０年代以前,人们对南极实地考察、资...     

太平洋和南极普里兹湾及其邻近海域中微生物量的分布特征

研究了太平洋和南极普里兹湾及其邻近海域细菌数量分布特征,并就其与诸环境因素的影响进行了讨论．结果表明,所调查的太平洋和南极普里兹湾及其邻近海域的细菌数量分布大都处于107～108个／dm3范围之内,发现太平洋中部的细菌数量分布高于其东部和西部,这主要与中部海域合有丰富的生物营养物质有关．由于受到水动力的影响,太平洋某些站位水层（0～50m,500～700m）中出现高细菌量值．发现南极普里兹湾及其邻近海域向外延伸的某些断面的细菌数量有逐渐递增趋势．     

Chlorophyll-specific absorption coefficients and pigments of phytoplankton off Sanriku, northwestern North Pacific

The variety in shape and magnitude of thein vivo chlorophyll-specific absorption spectra of phytoplankton was investigated in relation to differences in pigment composition off Sanriku, northwestern North Pacific. Site-to-site variations of the absorption coefficients,a _ph ^* (λ), and pigment composition were clearly observed. At warm-streamer stations, higher values ofa _ph ^* (440) anda _ph ^* (650) were found with relatively high concentrations of chlorophyllb (a green algae marker). At stations located in the Oyashio water (cold streamer),a _ph ^* (440) values were lower and fucoxanthin (a diatom marker) concentrations were higher, compared to the other stations. The peak in the absorption spectra at the Oyashio stations was shifted toward shorter wavelengths, which was probably due to the presence of phaeopigments. In a Kuroshio warm-core ring, the magnitude ofa _ph ^* (440) was in between those at the warm-streamer and Oyashio stations, and the diagnostic pigment was peridinin (a dinoflagellate marker). These findings indicated that major differences in phytoplankton absorption spectra of each water mass were a result of differences in the phytoplankton pigment composition of each water mass, which was probably related to the phytoplankton community.     

黔北普宜地区晚三叠世二桥组砂岩碎屑锆石U-Pb年龄、重矿物分析及地质意义

普宜地区位于上扬子腹地——四川盆地东南缘,区内晚三叠世碎屑岩记录了上扬子前陆盆地演化信息,是研究盆地东缘盆山耦合的理想对象.二桥组主要由三角洲平原-三角洲前缘相砂岩组成,交错层理恢复的物源主要来自东侧,砂岩岩屑主要由岩浆岩岩屑和变质岩岩屑组成,碎屑重矿物主要由锆石、电气石、金红石、白钛石、黄铁矿、锐钛矿、石榴子石、铬铁...