种群比较

The prevalence and abundance of the acanthocephalan exhibited very similar and significantly seasonal change patterns in O. uncirostris and H. bleekeri bleekeri. The infection levels were higher in autumn and winter, but lower in spring and summer. However, the infection levels in Z. platypus kept stable all the year round. There were significant differences among the overall abundance of the acanthocephalan in the three host populations. Nevertheless, the frequency distribution of the parasite in the three kinds of fish was over-dispersed in most seasons and in total as measured by the variance to mean ratio. The variance to mean ratio was not found related to the infection levels.

在感染率和感染丰度方面，寄生于马口鱼和油的木村小棘吻虫呈现出显著的季节变化：秋冬季节感染率和感染丰度都比较高，而春夏季节则比较低；与此不同的是，寄生于宽鳍鱲中的木村小棘吻虫则全年都维持着较稳定的感染水平；木村小棘吻虫种群在三种宿主体内的总体感染丰度差异显著，但都呈聚集分布，三者的方均比与感染率和感染丰度之间无显著相关关系。

The two methods had accurate results in forecasting Cricetulus barabansis, but not in Meriones unguiculatus. It was mainly because Meriones unguiculatus population was affected by environment factors at random, and the dynamic tendency was not obvious. It meant that the two time series methods were accurate for the populations which were little affected by environment factors at random.

两种方法对黑线仓鼠捕获率的预测都比较准确，对长爪沙鼠捕获率的预测结果不准确，主要是因为长爪沙鼠种群数量受周围环境因素的影响随机性较大，趋势不太明显，说明此两种时间序列分析方法适用于受随机因素的影响较小，去掉随机因素的影响后有较好的趋势变化的种群。

The species diversity index of the Potaninia mongolica community was higher than that of three other communities and lower than that of Oxytropis bicolor community, and Potaninia mongolica, its dominant tree was stabile, therefore the community was a stabile community.

绵刺+珍珠猪毛菜+泡泡刺群落物种多样性指数比较高，生态优势度也较高，该群落比较稳定，其建群种的绵刺种群同样处于稳定阶段，所以群落是比较稳定的。

Based on a systematic field investigation and laboratory experiments, the structures of arthropod communities and the evalution of dominant predatory enemies in cabbage fields of different seasons were studied. The main results were as follows:1 The structures and their dynamics of arthropod communities in cabbage fields1.1 Species composition and population dynamics of each species of the arthropodcommunities in the cabbage fieldsThe research results showed that the occurrence of Pieris rapae in spring cabbage fields was relatively grave.

本文在田间系统调查和室内试验的基础上，对不同季节甘蓝田节肢动物群落结构及捕食性天敌优势种的评价进行了研究，主要结果如下：1甘蓝田节肢动物群落结构及其动态1.1节肢动物群落物种构成和各种群数量动态研究结果表明，春甘蓝田菜青虫的发生比较严重，菜青虫在调查期间种群数量呈上升趋势，5月初高峰期平均每株甘蓝接近20头；菜蚜与小菜蛾的发生相对较轻，菜蚜在5月中旬有个明显高峰。

Observations on embryonic stage and nuclear number The embryonic development stage of encysted embryos of four Artemia populations from Qinghai-Tibet Plateau was studied with paraffin section method, and the nuclei numbers of encysted embryos were estimated by counting nuclear on squashed preparations.

不同种群卤虫卵卵壳结构的观察比较利用扫描电镜和透射电镜对七个种群(GH、AQK、山西解池SIN、山东埕口盐场CK、西藏、新疆鲸鱼湖、西藏拉果错湖LGC)的卤虫卵的卵壳结构进行观察。

Activities of polyphenoloxidase, true choline esterase, glutathione S transferase, superoxide dismutase and catalase of the beet armyworm, Spodoptera exigua, were tested in vivo in a relatively susceptible population kept in the laboratory and a population collected from vegetable field in Wuhan.

用一个采自武汉地区的甜菜夜蛾田间种群和一个相对敏感种群，比较了甜菜夜蛾的表皮酚氧化酶、乙酰胆碱酯酶、谷胱甘肽S转移酶、超氧化物歧化酶和过氧化氢酶酶活力差异。

The results of measuring chromosome and one-way ANOVA analysis showed that the relative length of all autosomes was different among the sheep breeds.The X chromosomes were similar and the Y chromosomes were different not only in relative length p

测量染色体长度，计算相对长度，并进行单因素方差分析表明，绵羊各常染色体的相对长度之间存在一定的差异；对性染色体进行Duncan′s 多重比较，种群间X 染色体差异较小；Y 染色体种群间不但存在形态差异，且在相对长度上差异极显著P

The dominant species in the tree layer were found as Castanopsis chinensis, Endospermum chinense and Cryptocarga concinna . The Mesophanerophytes and Microphanerophytes were found having high percentage, and the Megaphanerop, Geophytes and Therophytes were notfound in the species life form spectrum of the community. The Mesophyll also had high Percentage in leaf-sizeclass spectrum of the community.

本群落以中、小高位芽植物占优势，缺乏大高位芽、隐芽和一年生植物叶型以中型叶为主群落的大部分优势种的种群分布格局是随机分布的优势种群的立木结构分析表明，本群落处于进展演替它与30a前比较有较大的变化乔木层原优势种黄桐、猴耳环、亮叶肉实等被锥粟、刺栲等替代。

To detect potential influence from geographical isolation upon population differentiation in small mammals, the skulls of Tibetan pikas among three isolated populations in western Sichuan Province were systematically compared.

为探讨地理隔离对小型兽类种群分化的影响，本文系统比较了四川西部3个隔离藏鼠兔Ochotona thibetana种群在头骨形态上的异同。

Significant differences were shown in the observation times of females during the peak and the middle of the reproductive season at different densities. The observation time of the females was much longer in low density population than that in high density population. For males, there was no significant difference in observation time between or among population densities. At both low and high population densities significant seasonal variation was found in the duration and frequency of male plateau pikas observation behavior, nor was that of females.

结果表明：在繁殖盛期和繁殖中期，低密度种群内雌性高原鼠兔的观望时间均显著高于高密度种群内，而在其它两个时期内无明显不同；雄性高原鼠兔的观望时间在不同密度间比较均无显著差异；同一密度条件下，雄性高原鼠兔的观望行为持续时间和发生频次均表现显著的季节性变化，而雌性高原鼠兔无明显差异。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。