查询词典 populations

The basic idea of oscillating populations is not new to ecology.

其实振荡种群的基本观念对于生态学并不是一个新玩意儿。

Drought stress significantly and morphologically affects cells, organs, individuals and populations of plants, and also physiologically and biochemically impacts their photosynthesis, osmoregulation and antioxidant system.

干旱胁迫对植物在细胞、器官、个体、群体等水平上的形态指标有显著影响，也会影响其光合作用、渗透调节、抗氧化系统等生理生化指标。

Sis as the out-group. The molecular phylogenetic tree was constructed by NJ method using software MEGA 3.1, and three populations of M. nipponense were clustered first and then clustered with M. hainariense; M. rosenbergii and M. malcolmsonii, as well as M. Icr and M. latimanus had a closer genetic relationship and were clustered first, then they were clustered with M. carcinus and M. equidens, and finally with Fenneropenaeus chinensis.

用MEGA 3.1软件中的NJ法构建的分子进化树，日本沼虾3个群体先聚在一起后与海南沼虾聚在一起；另外，罗氏沼虾与马氏沼虾、短腕沼虾与贪食沼虾亲缘关系较近先聚在一起，然后再与大臂沼虾和等齿沼虾聚在一起，最后才与外群中国明对虾聚在一起。

There is also a general lowering of vigor in inbred stock, which is especially pronounced amongst normally outbreeding populations.

而杂合型出现的频率降低，因而降低了种群基因的潜在可变性。

This indicates that seed production of the studied species must be reduced by available resources. To detect the difference of seed production between flowers pollinated by self and outcross pollen, hand pollination for bagged flowers has also been conducted in natural populations of the two Pedicularis species.

除了上述结果外，我们的人工实验还表明，人工补充授予同株或异株的花粉都未能增加种子产量，而疏花处理则明显的增加了剩余花的结实，这说明较之于花粉数量的限制而言，资源限制是影响这两种植物雌性育性的原因。

To keep certain number of greater patches through protection and restoration in urban area is meaningful;(2) small greenland patches with diverse structure may promote the heterogeneity of urban landscape, and serve as colonial land and stepping stones for certain populations, and create rich types of habitats and ecological niches. So laying small patches in urban environment is also important. Incorporation of the coarse grain and fine grain, aggregation and outliner of landscape elements may creates better landscape patterns;(3) many literatures have showed that good landscape connectivity benefits the longer persistence of species and the conservation of biodiversity.

大的绿地斑块有多种作用，通过城市地区自然景观斑块的保护或城市绿地的建设，在城市中维持一定的较大规模的绿地斑块是有积极意义的；（2）结构不同的小的绿地斑块可增加城市的景观异质性，为生物提供迁徙地、扩散暂歇地，创造丰富的生境资源和生态位，因此，结合大的绿地斑块的建设，同时布置小的绿地斑块作为补充，粗粒、细粒结合，集聚、分散结合是形成优良绿地景观格局的途径；（3）诸多的文献已显示，好的景观连接性有利于物种持续较长的时间，从而有利于生物多样性的保护。

Populations of plants or animals that outran their niches were kept in reasonable range by human "arbitration."

超过生态位[2]的植物或动物的数量都遭到了人类的"仲裁"，保持在合理的范围内。

Estimation was made of oviposition cycle duration and survival rates of natural populations, and effects of wind speed on the estimation of population parameters were observed.

在确定媒介蚊虫传病效率时，平均存活率和产卵周期是最重要的两个昆虫学参数：这些参数决定了蚊虫的寿命和蚊媒病原体的净增殖率。

K value, canopy development and the rate of dry matter production among populations with different panicle types.

因此，在叶面积较大时，直立穗型群体的干物质生产和产量高于半直立或弯曲穗型群体。

For the first time, this study conducted a series of field sampling in multiple locations over several years and demonstrated that the B and Q biotypes first invade areas with high frequency of transport through human movement of plant materials, and then rapidly spread into surrounding areas and displace indigenous genotypes, and in parallel with displacement significant changes in sex ratio occurred in the mixed populations. Crossing experiments demonstrated that in the B. tabaci species complex there are many genetic groups that are completely or nearly completely isolated in reproduction. Apart from behavioural mechanisms, difference in host plant suitability and insecticide susceptibility between whitefly biotypes may also play important roles in the displacement of indigenous whiteflies by alien whiteflies in Zhejiang.

本研究首次以一个地理区域内广泛系统的野外调查数据证实，B型和Q型烟粉虱首先通过花卉苗木调运入侵交通较为发达的地区，然后迅速向周边扩张并取代土著烟粉虱，同时入侵取代过程伴随着混合种群中性比的变化；杂交试验证明烟粉虱复合种内存在多个生殖上隔离或基本隔离的遗传群；B型烟粉虱在浙江省内迅速取代土著烟粉虱，除行为机制外，生物型之间寄主适应性和药剂敏感性等方面的差异也可能在此过程中起着重要作用。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。