查询词典 populations

They produce no offspring of their own, one consequence of which is that populations of plants and animals capable of self-fertilisation, or "selfing", grow at twice the rate of populations that depend on sexual reproduction.

他们不会繁衍自己的后代，一个后果就是，能够自体受精的动植物数量的增长率，是依赖有性生殖的两倍。

No significant seasonal differences were observed in plateau pikas aggressive and affiliative behaviors from either low or high density populations. Additionally, no significant differences existed between populations with different densities.

在高原鼠兔的社会行为中，亲昵行为和攻击行为强度在不同种群密度间比较均无显著差异；在同一密度条件下，亲昵行为和攻击行为强度也没有表现出明显的季节性变化。

It is one of the most dominant small mammals and plays an important role in keeping the balance of the alpine meadow ecosystem.The aim of this paper was to investigate the level of genetic diversity and also to test the hypothesis of IBD for this old species.Samples of plateau pikas were collected from four natural populations（Haiyan,Xidatan E,Xidatan W and Kunlunshan populations）.

采用多态信息含量、期望杂合度、观测杂合度、基因流和基因分化系数对种群及物种的遗传多样性水平进行分析；计算各种群间的遗传距离、遗传相似度以及遗传距离与地理距离的相关系数，并进行UPGMA聚类分析。

Using the two-stream fluid model, the linear dispersion relation is derived assuming a two-dimensional spatial geometry. Two cases are considered, one is that the 2D spatial geometry is defined by the plane containing the two counterstreaming electron populations and the perturbation wave vector , and the other is that the geometry is defined by the plane being vertical to the two counterstreaming electron populations .

对高能束流和电子回流构成的双流系统，建立冷等离子体流体模型，采用简正模分析方法，分别考虑扰动波矢在平行于电流传播方向的平面上和在垂直于电流传播方向的平面上这两种情况，推导了不稳定性的色散关系。

Hierarchical Clustering of 6 sheep populations based on 17 quantity indexes including body measurements, ecological and morphological characters indicates that 6 sheep populations can be classified in two types: the first includes Mongolia sheep and Tan sheep distributed in husbandry area and the juncture of agriculture and husbandry area, the second includes Daweihan sheep , Xiaoweihan sheep , Tong sheep , Hu sheep distributed in agriculture area.

以概括体尺、形态、生态特征的17项数量指标为基础的6个群体的系统聚类表明：6个绵羊群体被划分为二大类，一类为牧区及农牧交错区的蒙古羊、滩羊，另一类为农区的大尾寒羊、小尾寒羊、同羊、湖羊。17项数量指标的主成分分析，用已构造的各群体的主成份值进行R型系统聚类，获得与前者类似结果。

Polymorphic loci, polymorphic frequencies, Nei's index of phenotypic diversity and Shannon index were 228, 62.81%, 0.2781, 0.4092, respectively, among Changjiang population, and 269, 74.10%, 0.3077, 0.4493, respectively, among Minjiang population. The results suggested that the two East Sea eel populations had abundant genetic variation, and the Minjiang river population was lower than the Changjiang river population, which indicated that high levels of genetic variation existed in the natural populations of Chinese Anguilla japonica.

结果表明：6对选择性扩增引物共检测到363个位点其中闽江流域群体和长江口群体的多态位点数、多态位点频率、Nei's基因多样性系数、Shannon's信息指数分别为228和269、 62.81%和74.10%、 0.2781和0.3077、0.4092和0.4493，日本鳗鲡这两个群体均具有较丰富的遗传变异，但闽江流域群体的明显低于长江口群体。

Majority of the studies reported in the endodontics literature was conducted in European populations, few studies assessed endodontics treatment outcomes in Chinese populations.

但是，流行病学调查显示，被治疗牙的根尖周状况并未得到相应的改善，仍有相当数量的牙存在根尖周病变。

A pairwise comparison of paternity studies of bird populations in relation to genetic variability as determined by minisatellite band sharing coefficients among unrelated individuals was used to test the prediction that females should engage more frequently in extra pair copulations in populations with a greater amount of genetic variation.

小卫星共有谱带系数(minisatellitebandsharingcoefficient)可确定无亲源关系个体之间的遗传变异性，对与遗传变异性有关的雄性个体的父亲进行了成对比较以检验如下假说：在具有较多遗传变异的种群中，雌性个体更经常地进行配偶外交配。

Random sampling 36 wild Japanese quails from which migrated to and settled down the Weishan Lake area,and the gene frequency of 10 loci in viscera and muscle is detected. After collecting the same data about the 20 quail colonies in China and other populations and applying fuzzy discriminants, the domestic quails is discriminated to belong to which populations, wild Japanese quails or wild quails in the Weishan Lake area.

在迁飞滞留季节捕获的微山湖地区野生鹌鹑中随机抽取36只，检测编码脏器、肌肉酶型的10个结构基因座上的频率分布，搜集国内外20个家鹑和野生日本鹌鹑群体的相同资料，应用模式判别方法，以家鹑群体为识别对象，分别与野生日本鹌鹑和微山湖野生鹌鹑群体进行模糊性识别。

All through human history, centralized states with metal weapons and armies supported by dense agricultural populations have swept away sparser populations of huntergatherers.

贯穿人类历史的大势所趋是掌握有金属武器和军队，并得到稠密农业人口支援的集权国家终将数量较逊的猎手－采集者们扫除殆尽。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。