Bacterial communities fluctuate in abundance and diversity under simulated oil-contaminated seawater conditions     

LI Xiaohong  YOU Cai  QU Liang  ZHOU Bin  TANG Xuexi  XIAO Hui 《海洋湖沼学报（英文）》2019,(2):615-627

Marine bacteria have recently been identified as a potent solution for petroleum hydrocarbon degradation in response to hazardous oceanic oil spills. In this study, a mesocosm experiment simulating a petroleum spill event was performed to investigate changes in the abundance, structure, and productivity of bacterial communities in response to oil pollution. Cultured heterotrophic bacteria and total bacteria showed a consistent trend involving an immediate decrease in abundance, followed by a slight increase, and a steady low-level thereafter. However, the changing trend of bacterial productivity based on bacterial biomass and bacterial volume showed the opposite trend. In addition, the density of oil-degrading bacteria increased initially, then subsequently declined. The change in the bacterial community structure at day 0 and day 28 were also analyzed by amplified ribosomal DNA restriction analysis (ARDRA), which indicated that the species diversity of the bacterial community changed greatly after oil pollution. Alphaproteobacteria (40.98%) replaced Epsilonproteobacteria (51.10%) as the most abundant class, and Gammaproteobacteria (38.80%) became the second most dominant class in the whole bacterial community. The bacterial communities in oil-contaminated seawater (32 genera) became much more complex than those found in the natural seawater sample (16 genera). The proportion of petroleum-degrading bacteria in the oil-contaminated seawater also increased. In this study, culture-dependent and culture-independent approaches were combined to elucidate changes in both bacterial productivity and community structure. These findings will contribute to a better understanding of the role that bacteria play in material cycling and degradation in response to oil pollution.  相似文献   

山东南部近海春季大型底栖动物丰度、生物量及群落结构研究     

钟海霞  曲方圆  隋吉星  张蒙生  涂梁莉  赵凡淇  于子山 《海洋通报》2018,(1):88-98

于2007年4月对山东南部近海进行了32个站位的大型底栖动物研究,共发现大型底栖动物170种,其中多毛类87种,软体动物25种,甲壳类47种,棘皮动物7种,其他类群4种。排名前3位的优势种是背蚓虫(Notomastus latericeus)、东方缝栖蛤(Hiatella orientalia)和寡鳃齿吻沙蚕(Nephtys oligobranchia)。研究海域大型底栖动物总平均丰度为1494 ind/m~2,总平均生物量为13.88 g/m~2,生物多样性指数H′、J′和d的平均值分别为:3.856、0.805和4.004。在30%相似度水平上,该海域大型底栖动物可划分为4个群落。综合H′和ABC曲线的结果,山东南部海域底栖生态环境较好。  相似文献   

水产品中荧光假单胞菌(Pseudomonas fluorescens)RT-LAMP可视化检测方法的建立及应用     

魏梦泽  韩姣姣  芦晨阳  周君  陈炯  曲凌云  樊景凤  陈刚  苏秀榕 《海洋科学》2018,42(11):91-98

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Estimation of genetic parameters for upper thermal tolerance and growth-related traits in turbot Scophthalmus maximus using the Bayesian method based on Gibbs sampling   总被引：1，自引：0，他引：1  

MA Aijun  WANG Xin'an  HUANG Zhihui  LIU Zhifeng  CUI Wenxiao  QU Jiangbo 《海洋学报(英文版)》2018,(6)

In order to carry out the genetic improvement of turbot upper thermal tolerance, it is necessary to estimate the genetic parameters of UTT(upper thermal tolerance) and growth-related traits. The objective of this study was to estimate genetic parameters for BW(body weight) and UTT in a two-generational turbot(Scophthalmus maximus L.) pedigree derived from four imported turbot stocks(England, France, Denmark and Norway). A total of 42 families including 20 families from G1 generation and 22 families from G2 generation were used to test upper thermal tolerance(40–50 animals per family) in this study and the body weight of individuals were measured. The heritability of BW and UTT and the correlation between these two traits were estimated based on an individual animal model using Bayesian method based on two types of animal models with and without maternal effects.These results showed that the heritabilities for BW and UTT and phenotypic and genetic correlations between the two traits estimated from model without maternal effects were 0.239±0.141, 0.111±0.080, 0.075±0.026 and–0.019±0.011, respectively. The corresponding values from model with maternal effects were 0.203±0.115,0.055±0.026, 0.047±0.034 and –0.024±0.028, respectively. The maternal effects of BW and UTT were 0.050±0.017 and 0.013±0.004, respectively. The maternal effects had a certain influence on the genetic evaluation of the two traits. The findings of this paper provided the necessary background to determine the best selection strategy to be adopted in the genetic improvement program.  相似文献   

渤海陆源入海污染源在线监测系统建设探究          下载免费PDF全文

张蒙蒙  曲宣彰  赵玉慧  于庆云  尹维翰  宋文鹏 《海洋开发与管理》2018,35(1):95-99

文章通过探究国内外在线监测技术发展状况,针对渤海陆源入海污染源环境现状,从国家方针政策、监测体系现状等多方面提出了渤海陆源入海污染源在线监测系统建设的必要性。并根据目前渤海陆源入海污染源在线监测系统的建设情况,分析其存在的问题,提出通过加快标准制度建设、引导社会力量参与研发、顶层设计分步实施、强化人才队伍建设等方面举措推进在线监测系统建设工作,以期能为正在进行的渤海陆源入海污染源在线监测系统建设提供帮助。  相似文献   

青岛港董家口港区航道工程临时海洋倾倒区及其周边海域水质评价          下载免费PDF全文

姜万钧  屈文  马海静 《海洋开发与管理》2018,35(8):51-59

为掌握海洋倾倒区海水水质状况和倾倒活动的影响,为海洋倾倒区的使用和管理提供技术支撑和科学依据,文章针对青岛港董家口港区航道工程临时海洋倾倒区及其周边海域,选取单因子质量指数、多项水质参数综合指数、综合质量指数、富营养指数和有机污染指数,分别对2012-2015年研究区表层和底层海水水质监测数据进行分析和对比。研究结果表明,受倾倒活动的影响,研究区表层和底层海水各项指数及其分布差异很大:单因子质量指数全部达到二类水质标准,2013年变化较大,而后恢复且平稳;多项水质参数综合指数于2014年全面升高,尤其是倾倒区最为明显,2015年倾倒区内出现低值区,但其周边海域仍较高;综合质量指数总体为良好,2014年高值区明显扩大,尤其是倾倒区最为明显,2015年倾倒区有所降低,但其周边海域仍较高;富营养指数于2012年和2014年明显提高,2013年和2015年营养水平较低,均未出现明显的富营养化;有机污染指数显示2012年和2014年开始受到污染,2013年较好,2015年大部分区域开始受到污染,且污染程度较高;海水水质受倾倒活动影响明显,应加强监控和管理。  相似文献   

2003年新疆巴楚-伽师6.8级地震序列特征分析   总被引：2，自引：0，他引：2  

曲延军  聂晓红 《内陆地震》2005,19(1):65-73

对2003年新疆巴楚—伽师6．8级地震序列进行了初步分析,结果表明其余震具有共轭型分布特征,多种地震学参数在序列中的较大余震前有不同程度异常显示,余震具有较为特殊的地震波形,与1997-1998年伽师强震群相比具有多处异同点等。结果认为巴楚—伽师6．8级地震可能为具有继承伽师地震特点的余震起伏变化较大的主余震型。  相似文献   

班怒成矿带中段雄梅地区碰撞后含铜岩浆岩类型、时代及成因     

黎心远  曲晓明  马旭东  陈伟  孙渺 《地质学报》2020,94(4):1264-1281

雄梅地区位于西藏班公湖-怒江成矿带中段申扎县,区内分布有舍索矽卡岩型铜多金属矿,雄梅斑岩型铜钼矿,以及桑日、苦嘎矽卡岩铜矿点,相应地发育多套含铜岩浆岩。本文通过系统的锆石U- Pb年龄、全岩Pb同位素及岩石地球化学分析,厘定了这些含铜岩浆岩的时代和成因类型。初步查明它们先后形成于约110Ma(舍索,雄梅,苦嘎)和80Ma(桑日)两个岩浆活动阶段。雄梅地区岩浆活动的时代及源区具有明显的后碰撞阶段特征,其中雄梅矿区的含矿花岗闪长斑岩具高铝、钙碱性特征,为由泥砂质沉积岩生成的S型花岗岩。舍索、桑日、苦嘎矿区的含矿岩体均为I型,显示原岩为火成岩。岩石地球化学表明这些含矿岩体富集大离子亲石元素(Rb、Sr、Th、Pb),亏损高场强元素(Nb、Ta、Ti),显示出俯冲沉积物组分对岩浆形成产生过重要影响。在早白垩世时期,俯冲板片断离,大量的软流圈物质上涌并参与岩浆活动,促使上地壳组分熔融,携带大量成矿元素形成含矿岩浆岩,在近地表形成雄梅、舍索及桑日矿床;晚白垩世时期,加厚的岩石圈在重力作用下拆沉,减薄的岩石圈在上涌地幔的底侵作用下发生熔融,形成桑日矿床。  相似文献   

中国东部燕山期斑岩钼-热液型铅锌(银)成矿系统的成矿物质来源     

谢玉玲  崔凯  夏加明  王莹  曲云伟  于超  单小瑀 《地学前缘》2020,27(2):182-196

中国是世界第一大钼生产国和资源国,同时也是铅、锌的重要资源国。中国东部燕山期斑岩型钼矿床及热液脉型、夕卡岩型铅锌(银)矿床是中国钼、铅、锌的主要来源。前人基于斑岩钼和热液型铅锌(银)矿床的地质、地球化学研究,提出了中国东部燕山期斑岩型钼-热液型铅锌(银)成矿系统的新认识,但对该成矿系统的岩浆起源、成矿物质来源等仍存在认识上的分歧。近年来,越来越多的地质、地球化学证据表明,斑岩钼矿的成矿可能与幔源岩浆活动有关,成矿斑岩的Sr、Nd、Pb同位素组成也显示有幔源物质的贡献。碳酸岩作为典型的幔源岩浆岩,是研究地幔物质组成的探针岩石,源自俯冲交代富集地幔的碳酸岩是已知Mo含量最高的岩浆岩,同时其Pb、Zn、Ag含量也很高,并具有富水、富F、富S、富CO₂的特征。中国东部与斑岩钼矿同期的碳酸岩、基性岩的地球化学研究表明,中国东部中生代地幔为经历了俯冲交代的富集地幔,富集地幔的部分熔融可能为斑岩钼-热液型铅锌(银)成矿系统提供了成矿岩浆、成矿金属,同时还可能提供了S、F和成矿流体。  相似文献   

Multiple Deformation in the Northeastern Alxa Block: Implications for the Southern Central Asian Orogeny and Its Subsequent Intraplate Evolution     

ZHANG Jin  QU Junfeng  ZHANG Beihang  ZHAO Heng  ZHENG Rongguo 《《地质学报》英文版》2020,94(Z1):84-85

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