汕头南澳海水养殖区不同水层重金属的分布和环境质量评价

利用电感耦合等离子发射光谱(ICP-AES)方法测定了汕头南澳海水养殖区溶解态的重金属在不同水层中的分布.在龙须菜、鱼类和贝类养殖水域检出Fe、Zn、Mn、Pb等重金属,其中微表层(SML)和底层(BW)是这些重金属的主要存在区域.这些重金属在微表层(SML)中的浓度(Fe 27.5-286.5 μg/L,Zn13.5...     

胶州湾生态环境分析预警系统——主要营养盐月际变化及其成为生物生长限制因素的概率计算

在胶州湾海洋生态环境GIS数据库的支持下，构筑了胶州湾主要营养盐硅、磷、氮的分析预警系统。该系统主要提供以下两大功能；（1）数据的显示、查询、更新和打印。（2）胶州湾内次月硅、磷、氮的预测值及硅、磷、氮成为抑制海洋浮游植物生长限制因素的概率计算。当上述概率超过了给定的阈值时，系统将发生警限。     

海水养殖亲鱼的营养研究动态

海水养殖亲鱼的营养和饲料研究 ,国内基本上是空白。近年来 ,国外已有较多报道 ,特别是对亲鱼营养状况和生殖的关系、亲鱼营养在改善生殖性能和卵子质量以及仔稚鱼生长与存活等方面的作用非常重视 ,已取得了许多有用的资料。主要研究成果有 :(１)在金鲷(Ｓｐａｒｕｓａｕｒａｔａ)、狼鱼 (Ｄｉｃｅｎｔｒａｒｃｈｕｓｌａｂｒａｘ)等鱼类的研究表明 ,饲料蛋白质 (主要是必需氨基酸 ,ＥＡＡ)和脂肪 (主要是ｎ ３多不饱和脂肪酸 ,ｎ ３ＰＵＦＡ )的成分与含量显著影响雌鱼的生殖性能及卵子的成分和质量 ,进而影响仔稚鱼的生长和存活［４ ,１０…     

珠江广州河段微表层与次表层水环境质量比较(英文)

The water quality in the surface microlayer(SML) and subsurface water(SSW) in the Guangzhou segment of Pearl River, a eutrophic urban river section in China, were analyzed. The spatial and temporal dynamics of nutrient concentrations, heavy metals and bacteria were examined from two sampling sites in monthly samples throughout 2010. The mean concentrations of total nitrogen, ammonia, nitrate and nitrite were higher than 7.0 mg/L, 3.1 mg/L, 1.1 mg/L and 0.3 mg/L, while total phosphorus and orthophosphate were 0.5 mg/L and 0.1 mg/L, respectively. These results indicated that the water quality was rich in minerals and eutrophic. The mean concentrations of Mn and Fe were higher than 0.013 mg/L; and Ni, Cr and Pb were higher than 0.001 mg/L. The mean concentrations were in the order of Mn Fe Ni Pb Cr. The concentrations of heavy metals in the Guangzhou segment were lower than the limit of the surface water quality standards in China and the World Health Organization(WHO), but higher than the median values in the world's freshwater. The density of bacteria ranged from 3.30×105 to 5.23×106 cells/mL, and the amount of cultivable heterotrophic bacteria ranged from 1.30×10 3 to 1.89×10 6 cfu/mL. Fecal coliform levels were beyond the V class of China water quality standard. The SML was enriched in nutrients, heavy metals and bacteria, with the maximum enrichment factor of 3.84 for nutrients, 8.00 for heavy metals, and 3.04 for bacteria, suggesting that the water quality of the SML of the Guangzhou segment of the Pearl River was more serious than in the SSW.     

基于DNA条形码技术的浮游动物休眠卵种类鉴定:以洞庭湖流域常德柳叶湖为例

以洞庭湖流域的典型城市湖泊常德柳叶湖表层沉积物中浮游动物休眠卵为研究对象,采用DNA条形码技术进行种类鉴定,从191个休眠卵中成功获得101条有效序列,鉴定成功率约为53%.根据NCBI数据库比对成功鉴定休眠卵9科12属11种,另有6个样品鉴定到属或科;3个类群的种间遗传距离平均为种内遗传距离的68倍,表明可以利用线粒体细胞色素c氧化酶第一亚基编码基因(COⅠ)对休眠卵进行有效物种鉴定.通过Neighbor-Joining树进行系统发育分析,发现所鉴定的物种与其参比序列聚类为一支,所有物种分别聚为独立的一个支系,不同物种可有效区分.研究结果均表明,COⅠ基因作为DNA条形码可以实现沉积物中浮游动物休眠卵的物种鉴定.