为了解拒马河鱼类时空分布及影响因子,基于2019—2021在拒马河的6次季节性鱼类调查,分析了拒马河鱼类群落结构及其与环境因子的关系。结果显示:共采集37种鱼类,隶属5目11科,鲤形目最多,占总种数的64.86%。相对重要指数(Index of relativ...为了解拒马河鱼类时空分布及影响因子,基于2019—2021在拒马河的6次季节性鱼类调查,分析了拒马河鱼类群落结构及其与环境因子的关系。结果显示:共采集37种鱼类,隶属5目11科,鲤形目最多,占总种数的64.86%。相对重要指数(Index of relative importance,IRI>)显示,IRI>≥500的优势种鱼类有10种,以鲫Carassius auratus Linnaeus、麦穗鱼Pseudorasbora parva Temminck&Schlegel、黑鳍鳈Sarcochilichthys nigripinnis Günther和宽鳍鱲Zacco platypus Temminck&Schlegel为主。单因素方差分析(ANOVA)表明,春、夏、秋季鱼类群落的个体数(N)、物种数(S)、Shannon-Wiener多样性指数(H’)和Margalef丰富度指数(DMa)存在显著差异,Pielou均匀度指数(J’)无显著差异。SNK多重比较检验(Student-Newman-Keuls)显示个体数、种类数以2019年5月(春季)最多,Shannon-Wiener多样性指数、Margalef丰富度指数以2019年8月(夏季)最高。等级聚类分析(Cluster)和非参数多变量排序(NMDS)分析显示,拒马河鱼类群落在空间上分为3组,上游S1拒马河源头和S2刁江汇为组Ⅰ,中游S3紫荆关大桥和S4清凉涧为组Ⅱ,中下游自S5小丰口桥至S15龙安大桥为组Ⅲ。丰度生物量比较曲线(ABC曲线)分析显示,2020年夏季鱼类群落结构稳定未受干扰(W=0.064),其余月份均受中度干扰(W<-0.007)。冗余分析(RDA)显示,海拔、水温和pH为影响拒马河鱼类群落结构时空变化的主要环境因子。研究可为拒马河鱼类资源保护和生态修复提供依据。展开更多
There are two types of Human Immunodeficiency Virus （HIV）： HIV-1 and HIV-2. HIV-1 dominates epidemics in many different parts of the world, and HIV-2 is principally responsible for the epidemic in westem Africa. In...There are two types of Human Immunodeficiency Virus （HIV）： HIV-1 and HIV-2. HIV-1 dominates epidemics in many different parts of the world, and HIV-2 is principally responsible for the epidemic in westem Africa. In China, Zeng et al have reported the first individual infected with HIV-1 in 1985. And in the 1990s, there was a severe epidemic involving the HIV-1 B＇ strain among people who sold blood and plasma in Henan, Hubei and adjacent provinces. To further study in HIV/AIDS vaccines and HIV-1 drug resistance for people in these regions, we need to construct an infectious HIV-1 B＇ molecular clone which is representative of the virus in these areas. To this end, we have isolated a HIV-1 B＇ virus from a child who was infected with HIV-1 from his mother in Hubei province, and have constructed a full-length clone from this genome.展开更多
基金This study was supported by the grants from the National High Technology Program 863(2005AA219070)the Project 973 of the National Program of China(2005CB522903).
文摘There are two types of Human Immunodeficiency Virus （HIV）： HIV-1 and HIV-2. HIV-1 dominates epidemics in many different parts of the world, and HIV-2 is principally responsible for the epidemic in westem Africa. In China, Zeng et al have reported the first individual infected with HIV-1 in 1985. And in the 1990s, there was a severe epidemic involving the HIV-1 B＇ strain among people who sold blood and plasma in Henan, Hubei and adjacent provinces. To further study in HIV/AIDS vaccines and HIV-1 drug resistance for people in these regions, we need to construct an infectious HIV-1 B＇ molecular clone which is representative of the virus in these areas. To this end, we have isolated a HIV-1 B＇ virus from a child who was infected with HIV-1 from his mother in Hubei province, and have constructed a full-length clone from this genome.
