基于cox1条形码的鱼肚DNA分子鉴定     

朱惠敏  连一阳  王中铎  郭昱嵩  刘楚吾 《广东海洋大学学报》2014,(6):1-5

为鉴定鱼肚的正品来源,运用一对特异性引物扩增并测定10 个不同价格（700～1 500 元/kg）鱼肚样本的线粒体DNA 细胞色素c 氧化酶Ⅰ（cox1）约660 bp 的序列.通过BLASTN 比对DNA 序列同源度,判定鱼肚所属种类分别为鲈形目石首鱼科（Sciaenidae）、马鲅科（Eleutheronema）、笛鲷科（Lutjanidae）、带鱼科（Trichiuridae）.cox1 条码序列获取便捷,基于此条码序列的物种鉴定技术可用于鱼肚种类鉴别.  相似文献   

Effects of corridor networks on plant species composition and diversity in an intensive agriculture landscape     

Qian Tang  Guofu Liang  Xunling Lu  Shengyan Ding 《中国地理科学(英文版)》2014,24(1):93-103

The development of modern agriculture has resulted in much homogenization of the landscape consisting of large patches of farmland,so small remnant non-crop habitats especially linear corridors play an important role in the conservation of species and the maintenance of ecosystem functions.However,little attention has been paid to the effects of corridors structural characteristics on the plant species restricted to such habitats.In this study,we selected three types of corridors including ditch,hedgerow and road,and ana-lyzed their structural characteristics.The plant species presented in these corridors were investigated,and the species diversity,abun-dance and frequency were estimated.Moreover,spatial arrangements of corridors were classified into different types to discuss whether there were significant effects of corridor network on plant distribution.The results show that three types of corridors have different ef-fects on plant species composition and diversity.The one-one combined corridor networks and total network associated by three corri-dors have more complex structural features than each single type of corridor.However,there is no strong correlation between the corri-dor networks with their plant species.We suggest that carrying out a pointed vegetation survey at corridor intersections to further test the relationships between structural features of corridor and plants is necessary.  相似文献   

Ecological indicators showing the succession of macrofauna communities in Sonneratia apetala artificial mangrove wetlands on Qi’ao Island at Zhuhai, South China     

TANG Yijie  FANG Zhanqiang  ZHANG Zaiwang  ZHONG Yanting  CHEN Kang  LIU Benhan  FAN Junjie  XIONG Tiantian  LU Xiaosheng 《海洋学报(英文版)》2014,33(8):62-72

The Sonneratia apetala artificial mangroves in the intertidal zone of Da Wei Bay at Qi’ao Island of Zhu-hai, South China were chosen as the macrofauna succession plots while bare tidal flats of the same size were established as control plots in surrounding interference-free areas. Conventional change indicators of community structure, such as biomass and biodiversity, and indicators, such as exergy and specific exergy, which reflect the information change of overall communities, were used to analyze the succession of macro-fauna communities inS. apetala artificial mangroves. The similarities and differences in variation tendency of the different ecological indicators and their reflected ecological principles were compared. The results showed that from D-1 to D-1275 after plantingS. apetala, the biomass of the macrofauna communities first increased, which was then followed by an increase in the network relationship between the macrofauna communities （analysis of the Pielou evenness index and Shannon-Wiener diversity index）. The system in-formation （specific exergy） increased the slowest. Between D-1460 and D-2370 after plantingS. apetala, there was a decrease in biomass, network structure, and system information in the succession plots. After the decrease in the system information （the specific exergy）, there was a decline in the network relationships （Pielou evenness index and Shannon-Wiener diversity index）. Biomass was the last indicator to decrease. The similarities and differences among the different ecological indicators varied during the succession pro-cess, which reflected the relativity and differences among the indicators. This study suggested that, although the species diversity index can be an effective indicator of two types of changes （network structure and system information）, it was quite clear that species diversity measurement was not suitable for expressing the changes in biomass during the succession process. While exergy and specific exergy can provide useful information  相似文献   

深海原生动物多样性研究进展   总被引：2，自引：0，他引：2  

陈旭淼  徐奎栋 《海洋科学》2014,38(10):119-126

<正>1引言原生动物是一大类单细胞真核生物的统称,其中自由生活的主要类群包括异养鞭毛虫、纤毛虫和肉足虫(有孔虫和放射虫为代表);它们是生物圈中数量最为庞大的吞噬营养类群,部分种类具有内共生藻类或功能性叶绿体而进行兼性营养。在水环境中,不论是浮游或是底栖生活的原生动物,其生命过程与水体和底质的环境存在着密切的联系;并且通过各种营养关系与其他生物共同联结成为一个有机整体。同时,原生动物的基础研究也为探索真核生  相似文献   

东海赤潮高发区沉积物柱状样中正构烷烃和脂肪醇的分布与来源   总被引：2，自引：0，他引：2  

李凤  刘亚娟  王江涛  贺行良 《沉积学报》2014,32(5):988-995

选取了东海赤潮高发区4个站位的沉积物柱状样,通过测定δ13C_TOC值,利用δ13C的双端元模型计算了沉积物中TOC的海源和陆源贡献率,并分析了正构烷烃和脂肪醇的组成与分布,探讨了其来源。结果表明,东海赤潮高发区沉积物中,正构烷烃以高碳数烷烃为主,有明显的奇碳优势,且呈双峰群分布;各站位总正构烷烃（T-ALK/μg/g）含量随深度有不同的变化;碳数奇偶优势指数（CPI）、陆源海源优势烷烃比（TAR）、平均链长（ACL）等正构烷分子指标,反映出在调查海区陆源正构烷烃的输入占主导,且以草本植物为主。直链烷基醇主要来源于陆地高等植物,4个站位的植醇经历了相似的生物化学过程,说明沉积环境较一致;菜籽甾醇与甲藻甾醇的比值指示了调查海区浮游植物种群的历史变化,由于水体富营养化的日益加重所导致的赤潮由简单的硅藻赤潮向硅藻甲藻混合型赤潮转变。  相似文献   

香港 国家地质公园     

《国土资源情报》2014,(5):F0003-F0003

正香港地质公园于2009年成为中国国家地质公园,于2011年加入世界地质公园网络,名为中国香港国家地质公园。香港地质公园位于香港东部和东北部,面积约150平方公里。根据地质环境特点,公园分为西贡火山岩园区和新界东北沉积岩园区,每个园区细分为4个景区,合共八个景区。由于交通便利,离市区只有咫尺之遥,被誉为都市里的地质公园。西贡火山岩园区坐落在一个有1.4亿年历史的巨大破火山口上。在直径超过10公里呈椭圆状的破火山口内,布满了罕有的酸性火山岩六角柱,石柱平均直径1.2米,近破火山口中心的石柱直径超过2米;石柱一般高数十  相似文献   

我国华南近海赤潮发生发展的温、压演变模式     

吴瑞贞  马毅  宋萍萍  李华建 《海洋预报》2010,27(1)

通过分析,归纳出3种赤潮发生前后水温、气温和气压的演变模式,并论述各种演变模式与赤潮发生发展的关系。通过数理统计,归纳了华南近海赤潮发生前后阶段水温、气温和气压的变化范围以及演变特征,说明了升温降压天气过程、温压稳定过程以及相对于多年月平均值偏暖的年份或时段均有利于赤潮的发生发展。  相似文献   

热带浮游植物将被迫“搬家”去极地?     

胡德良 《海洋世界》2013,(2):46-47

浮游植物指悬浮于水中的微小藻类植物,是浮游生物中的自养生物部分。浮游植物广泛存在于河流、湖泊和海洋中,多分布于水域的上层,个体极小,需要用显微镜才能观察到,繁殖极快。在淡水中主要是蓝藻、绿藻、硅藻等,在海水中主要是硅藻、甲藻。  相似文献   

有害赤潮与原生动物相互作用的研究进展     

张利永  颜天  周名江 《海洋科学》2008,32(10):86-92

近年来有害赤潮在全世界频繁爆发，规模也呈逐渐增大的趋势，其对海洋生态系统结构和功能的影响，引起了广泛关注。原生动物是海洋生态系统中微食物环的重要组分，通过其摄食，可以将中型浮游动物难以摄食的有机颗粒、微型浮游植物和微微型浮游生物连接到高级消费者。由于形成有害赤潮的浮游植物大都是细胞较小的微型浮游植物，因此，有害赤潮和原生动物的关系密切。  相似文献   

浅议赤潮     

《山东国土资源》2005,21(5):56-56

海洋是一种生物与环境、生物与生物之间相互依存，相互制约的复杂生态系统。系统中的物质循环、能量流动都是相对稳定，动态平衡的。当赤潮发生时这种平衡遭到干扰和破坏。在植物性赤潮发生初期，由于植物的光合作用。水体会出现高叶绿素a、高溶解氧、高化学耗氧量。赤潮造成的环境改变，使一些海洋生物不能正常生长，导致一些生物逃避甚至死亡，破坏了原有的生态平衡。  相似文献