The living planet index measures overall trends in populations of wild species around the world . it includes 555 terrestrial species , 323 freshwater species and 267 marine species 生生不息地球指数测量全球野生生物种群的整体趋势，包括555种陆地生物323种淡水生物和267种海洋生物。
The paper compares the most popularly used surplus production models using simulated data and swordfish , xiphias gladius , fishery data in the north atlantic ocean 本文应用目前常用的四种剩余产量模型对五种渔业条件下的渔业生物种群及北大西洋箭鱼种群xiphiasgladius评估结果作了比较。
We get the probability distribution of the population by the theory and method of markovian process , and discuss the model coefficients influencing on subsistence of a population 利用马尔可夫过程的理论和方法，得到生物种群数量变化的概率分布，最后讨论了各模型参数的变化对生物种群生存的影响。
Biotoxicity testing can intuitivey reflect the compositive toxicity of contaminated water to biology species , so it plays an important role in predicting and controlling chemical pollution 摘要生物毒性检测能直观地反映污染水体对生物种群的综合毒性，是预测和控制化学物质污染的一种不可缺少的辅助手段，因而得到了广泛应用和迅速发展。
If sites are encroached into , or species populations threatened , by unavoidable development , compensation mitigation in the form of recreated habitats and or species re - introduction should be undertaken to ensure that total biodiversity is not adversely impacted 若因不可避免的发展破坏该等生境，或威胁生物种群的存活，有关方面应实行补偿计划，包括重建生境区及或重新引入物种，确保生物多样性不受负面影响。
Systematic research across multiple subjects such as biology , chemistry and physics will be carried out , in order to understand the population variation of hab species in coastal china seas , to understand the mechanism of hab damage , to elucidate the ecological and oceanographical mechanism of hab construction , thereby provide scientific foundation for efficient methods for " hab prevention , control and treatment " , and contribute to the global morden theoretical system of hab ecology and oceanography 通过生物学、化学和物理海洋学多学科交叉综合研究，掌握我国近海赤潮生物种群动态变化规律，了解其危害机理，阐明赤潮高发区赤潮形成的生态学、海洋学机制，为建立"预防、控制和治理赤潮"的有效方法提供科学依据，同时也为发展全球赤潮生态学和海洋学现代理论体系作出贡献。
Ecological prevention and control means to take various measures and carry out a series of activities to create conditions that are unfavorable to growth of pests according to relevant technological regulations based on classification of species of pests , their biological habits , local environment , climate , temperature and frequency of their activities 生物防治是指根据有害生物种群分类、生活习性、及当地的环境、气候、温度与害虫的活动频率等，结合相关技术规范要求，采取各种措施或开展各项活动，创造不利于害虫滋生之条件。
Therefore , we need more concrete function to better discribe the variation of some biological populations in our real world . the two important indexes r ( t ) and k ( t ) of logistic equation are asmptotic periodic function , and discussed by author . the asmptotic solution of the asmptotic periodic logistic function is obtained 因而，为了更好地刻划客观世界，我们需要用更加符合客观实际的函数来描述生物种群的变化，于是作者对logistic方程的两个重要的参数r ( t ) ， k ( t )分别是渐近周期函数时，研究渐近周期logistic方程的渐近周期解，并且得到了解的存在性，唯一性，全局吸引性等一些良好的性质
These are main problems of eutrophication . at first we select algae which grow under different level of nutrition ( or different development phase in the process of eutrophication ) , domesticate , selecte seed , and culture algae at the lab , and then we obtain dependence of each algae on nutrition and understand information of eco - breadth of nutrition of supplied alga through pure culture under different concentration of nutrition . we find out resource utilization , competition between interspecies and confirm the quantity - effec t relationship between succession of species and nutrition through mixed culture 本文首先选取在不同营养环境下(或富营养化过程的不同发展阶段)生长的藻类物种，在实验室内进行驯化、选种与纯化培养；然后通过不同营养水平的纯藻培养实验，获取不同藻种生长过程对营养物质的依赖行为，从而可以了解每一供试藻种的营养物生态幅信息；再通过对应培养浓度的混合培养试验，以期揭示生物种群间的资源利用与竞争行为，并可进一步确定生物种群的演替与环境营养物之间的量效关系。
On the other hand , this paper details the study on effects of environmental pollution on the algae growth besides essential nutrition , especially those of dye wastewater in sunan area on the process of eutrophication , from which we expect to know what the environmental pollution factors overlapping other factors interfere with the competitive relationships of different species and have a certain effects on the succession of water ecosystem species 另外，论文中的实验也涉及到除对藻类生长所必需营养物外的环境污染因子的影响。尤其是苏南地区的染料废水等对富营养化过程的影响，以期了解叠加在其他因素上的环境污染因子对生物种群间的竞争关系的干预，及对水生生态系统种群演替的影响和程度。
