Ecosystem structure and function in northern Beibu Gulf: zooplankton spatial niche and its differentiation

根据2006—2007年北部湾北部海域4个航次调查资料,采用k-优势度曲线法对浮游动物种(类)群进行排序分析,运用lEVInS公式和PIAnkA指数分析了主要优势种(类)群的生态位宽度值和生态位重叠程度,并通过除趋势典范对应分析(dCCA)研究生态位分化状况。结果表明,该海区浮游动物优势种(类)群按生态位宽度值可划分为广生态位、中生态位和窄生态位三大类型。其中,广生态位的种(类)群如肥胖软箭虫、亚强次真哲水蚤、长尾类幼体等具有较强的生态适应性,生活范围较广;窄生态位的种(类)群,对环境的适应性较差,对海流和水团等环境因素的变化具有指示意义。生态位宽度能够反映种(类)群丰度季节变化,但不能反映具体丰度大小。北部湾北部全年主要优势种(类)群的生态位宽度值介于0.08—0.77之间,并且各优势种(类)群的生态位宽度差异较大,种对间生态位重叠值介于0.02—0.89之间,平均生态位重叠指数为0.45,种(类)群之间利用资源环境的互补性较强,这与海域内生境多样化并且各优势种对环境适应能力的差异存在一定联系。dCCA分析表明,影响浮游动物分布的主要因子是水深、温度和盐度,其次是叶绿素A和溶解氧。The concept of ecological niche had remained as one of the core ideas in ecological research for almost a century,which was closely linked with interspecific competition,resource utilization had played an important role in the study of community composition and function,of the relationships among species,biodiversity,community succession and population evolution.Based on four seasonal investigations( Spring 2007,Summer 2006,Autumn 2007 and Winter 2006) in northern Beibu Gulf from 2006 to 2007,the niche breadth,niche overlap,spatial differentiation and environment effects on the abundance and spatial distribution of zooplankton were studied with qualitative and quantitative methods.The cumulative top 80% of zooplankton dominant populations were selected by the K-dominant curve method,then the niche breadths and their overlaps of zooplankton were measured using the formulas proposed by Levins Niche Breadth index and the Pianka Niche Overlap index,and the spatial niche differentiation was studied by using Detrended Canonical Correspondence Analysis( DCCA) method.The results showed that the zooplankton dominant species in northern Beibu Gulf were classified in to three groups,i e.,wide niche breadth groups( Bi= 0.60—0.77),middle niche breadth groups( Bi= 0.30—0.60),narrow niche breadth groups( Bi= 0.08—0.30) based on the niche breadth value.The niche breadths of zooplankton such as Sagitta enflata,Subeucalanus subcrassus and Macrura larvae were wider,which was related with their own characteristics and the capability of adapting environment,while the species whose niche breadths were narrower such as Doliolum denticulatum and Dolioletta gegenbauri will be considered as an indicative significance for ocean currents and water masses.Niche breadth could reflect the zooplankton abundance with the seasonal dynamic changes,and also could objectively reflect the species in the habitat in which the distributions of degree but it could not reflect the Accurate zooplankton abundance.The niche breadth values of dominance zooplankton species ranged between 0.08 and 0.77 in the whole year and The niche breadth difference among the dominant populations was great; The niche overlap values of dominance zooplankton species ranged between 0.02 and 0.89 in the whole year and the average niche overlap index was 0.45,there was strong complementarity in terms of the utility of resource among zooplankton populations,which had certain relationship with northern Beibu Gulf habitat diversification and the strong complementarity in terms of the utility of resource among zooplankton populations.The Detrended Canonical Correspondence Analysis result showed that depth,temperature and salinity had more important influence on the species spatial distribution than Chlorophyll a and dissolved oxygen.海湾公益项目(201005012); 我国近海海洋综合调查与评价专项(908-01-ST09

慢性乙型肝炎患者肝组织HBcAg表达模式与中医证型的关系

目的:观察慢性乙型肝炎(CHB)患者肝组织乙型肝炎核心抗原(HBcAg)表达模式与中医证型及肝组织炎症、纤维化等指标的关系并进一步探讨相应的机制。方法:选择CHB患者556例,均进行中医辨证分型及肝组织活检,测定肝组织HBcAg表达模式、炎症、纤维化程度及ALT、AST、HBV DNA水平。结果:(1)556例患者按中医辨证标准分为6组:瘀血阻络证44例、肝肾阴虚证42例、肝郁气滞证48例、肝郁脾虚证282例、湿热蕴结证140例、脾肾阳虚证0例;按HBcAg表达模式分HBcAg阴性组42例、胞浆型HBcAg组186例、胞浆优势型HBcAg组290例、浆核各半型HBcAg组38例。(2)经Spearman秩相关分析,肝组织HBcAg表达模式与肝组织炎症活动度、纤维化程度均呈负相关;经Fisher确切概率检验,肝组织HBcAg表达模式与中医证型分布具有相关性。结论:肝组织HBcAg表达模式与中医证型、肝组织炎症、纤维化程度均有相关性;HBcAg阴性组、胞浆型HBcAg组及肝郁脾虚证、湿热蕴结证多处于慢性乙型肝炎活动期,正气未伤,免疫功能较强,为抗病毒治疗的较佳时机。国家自然科学基金项目(No.81503529,No.81673660);;福建省科技计划引导性项目(No.2015D007,No.2016D012);;厦门市科技惠民项目(No.3502Z20174028);;厦门市重要重大疾病联合攻关项目(No.3502Z20179047);;福建中医药大学基金项目(No.XB2016080)~

月球陨石Dhofar 1442岩相学和地球化学特征

月球一直是行星科学和深空探测的研究热点和前沿,是了解地球和其他类地行星早期演化的窗口。除了阿波罗(Apollo)和月神(Luna)计划返回的月岩和月壤,月球陨石是目前人类获得的唯一来自月球的样品。月球陨石相比于集中在月球近边采集的样品具有更广泛的代表性(Arai et al.,2007;Hudgins et al.,2007:Jolliff et al.,2008:Korotev et al.,2009)