稻粉虱若虫空间分布型和抽样技术的研究

稻粉虱若虫空间分布型测定结果表明 :(1)频次分布检验结果为负二项分布和核心分布 ;(2 )聚集度指标测定为聚集分布 ;(3) Iwao的线性回归方程为 m* =0 .76 5 5 + 1.6 778m,属于聚集分布。在空间分布型研究基础上 ,探讨了资料代换模式、Iwao序贯抽样模型和最适抽样数模型     

稻粉虱Aleurooybotus indicus种群系统动态的模糊聚类分析

本文应用模糊聚类分析方法对稻粉虱Aleurooybotus indicus David of Subramanias种群系统动态进行模糊聚类分析,模糊聚类分析结果表明,在置信水平0.9640≤λi<0.9880的情况下,该种群系统分为6个亚系统:SS1、SS2、SS3、SS4、SS5和SS6。文中对各个亚系统的动态规律进行特征描述,以期为稻粉虱的综合防治提供理论依据。     

A restudy of Oryctocephalus indicus (Reed, 1910)

Restudy on morphology of Oryctocephalus indicus (Reed, 1910), based on specimens from Guizhou, China and Nevada USA, suggests that the subspecies regarded previously as Oryctocephalus indicus indicus (Reed, 1910), O. indicus latus Zhao et Yuan 2002, and O. indicus kobayashi Saito, 1934, are synonymous, and Oryctocephalus americanus Sundberg et McCollum, 2003 is a similar form of O. indicus. Oryctocephalus indicus is rediagnosed as having a glabella that is subconical in outline and tapering forward slightly; a thorax that comprises 12 segments, and a small pygidium that bears 2?3 axial rings with a terminal piece and a postaxial ridge. Oryctocephalus indicus is widely distributed in eastern Guizhou and ranges through a great interval of Kaili Formation. Its first appearance is almost identical with these events of trilobite extinction-recovery occurring at the end of the Early Cambrian, the alternation of acritach assemblages, the change of trace elements (REE) and stable isotopes (carbon) at the Wuliu-Zengjiaya section. As one of the key forms for defining the traditional Lower - Middle Cambrian boundary (the base of Cambrian Series 3 and Stage 5 in the new Cambrian chronstratigraphic standard), O. indicus has received detailed study and has more advantages than other species such as Ovatoryctocara granulata Tchernysheva, 1962 or Arthricocephalus chauveaui Bergeron, 1899.     

稻粉虱Aleurooybotus indicus及其天敌生态位的研究

通过对稻粉虱Aleurooybotus indicus及其天敌时间生态位和空间生态位的调查,测定了生态位宽度、生态位重叠和生态位比例相似性。在此基础上,构建时空二维生态位,并分析了稻粉虱及其天敌的发生规律和相互关系。     

Proposal and prospects for the global Lower-Middle Cambrian boundary

In recent years paleontologists have been working on the global stratotype section and standard point (GSSP) for the Lower-Middle Cambrian boundary in North America, China, Morocco, Spain and Russia. Continually, they suggest the potential first appearance datum (FAD) of the Middle Cambrian, such as Oryctocephalus indicus, Ovatoryctocara granulata, Acadoparadoxides mureroensis, Hupeolenus and Arthricocephalus chauveaui as being relevant to the potential stratotype section for the Lower-Middle Cambrian boundary. There are only a few trilobites distributed widely enough in the Early to Middle Cambrian connection, so virtually no trilobite(s) can act as the FAD for the global Middle Cambrian. The easily identified Oryctocephalus indicus is widely distributed in three realms of the global Cambrian. Its first appearance position is linked to the extinction of old species coevolution of new ones. It appears to be a comparatively good FAD of Middle Cambrian. The continuous and unbroken Wuliu section (Balang, Taijiang County, Guizhou Province, China) includes O. indicus and co-occurs with many benthic and nektonic trilobites. The evolution of acritarchs in the section, the changed characteristics of trace elements (REE and C isotopes) are generally consistent with the evolution of trilobites both above and below the boundary. Strata above the boundary yield the famous Kaili Biota. The Wuliu section is easily accessible from a main highway.     

A restudy of Oryctocephalus indicus (Reed,1910)

Since both Chinese[1]and American Palaeontolo-gists[2]proposed separately to mark the beginning ofthe Middle Cambrian based on the first appearancedatum (FAD) ofOryctocephalus indicus[3]in thesame year ,the suggestion has been considered seri-ously and adoptedfrequently[4—18].The InternationalSubcommission on Cambrian Stratigraphy (ISCS) hasorganized the Working Group,chaired by L.B. Mc-Collum,to select candidate sections that bear poten-tial to become a GSSPfor the traditional Lowe…     

Discovery of a predaceous drosophilid Acletoxenus indicus Malloch in South China,with descriptions of the taxonomic,ecological and molecular characters (Diptera: Drosophilidae)

A drosophilid, Acletoxenus indicus Malloch, with larvae preying on Aleurodicus dispersus and Aleurocanthus sp. (Hemiptera: Aleyrodidae), is discovered from Guangdong and Hainan Provinces, China, and its morphological, ecological and molecular characters are described.     

贵州剑河巴水崖、镇远朱砂凯里组研究--八郎潜在的国际中、下寒武统层型剖面的辅助剖面研究

贵州剑河县巴水崖和镇远县朱砂凯里组剖面中下部都有Oryctocephalus indicus的产出，说明Oryctocephalus indicus的分布具有普遍性。两个剖面中、下寒武统界线的划分和潜在的八郎鸟溜剖面中、下寒武统界线候选层型剖面的划分基本一致，可作为潜在的八郎鸟溜中、下寒武统层型剖面的辅助剖面。     

稻粉虱Aleurocybotus indicus对水稻产量损失结构的通径分析

本文采用通径分析方法,分析了稻粉虱为害引起水稻减产的原因。直接通径系数和间接通径系数的分析结果表明:对穗期或孕穗期后的水稻稻粉虱为害引起水稻减产的主要原因是水稻实粒数的减少。     

稻粉虱发育起点温度和有效积温的研究

通过观察不同恒温下稻粉虱生长发育情况,确定其各个虫态的发育历期,计算稻粉虱发育起点和有效积温,建立历期预测式.