比如种的改变，种群构成的变化等等。
目的了解武汉城区居民住宅、一般单位、重点单位室内家栖鼠种群构成。
Objective To investigate indoor commensal rodent population structure in populated area, general institutions and emphasis institutions indoor in Wuhan.
目的了解驻京郊某部营区蚊虫种群构成和密度情况，探索新型蚊虫采集手段。
Objective Find out the mosquito species and density in a military camp on Beijing suburb and search the new method of mosquito monitoring.
目的了解驻浙某部营区蚊虫种群构成、密度情况，为有效控制蚊虫提供科学依据。
Objective To know the species composition of mosquito and their density in a battalion of a military base in Zhejiang province for mosquito control effectively.
正是在这些种群中，我们开始看到自然色彩的基因构成发生了真正的变化。
It's in these populations that we begin to see real changes in the genetic makeup of natural coloring.
在孟加拉国和柬埔寨等国，鱼类种群的减少对沿海和内陆社区贫困家庭的健康状况构成了切实的威胁。
In places like Bangladesh and Cambodia, the depletion of fish stocks presents a real threat for the health of poor families in coastal and inland communities.
狩猎、车祸、栖息地的丧失都加快了西班牙猞猁的消亡，种群内部对猎食野兔的过度依赖以及外部疾病的侵扰也构成了同等的威胁。
Hunting, road kills, and habitat loss have sped the plunge of Lynx pardinus, as has near-total dietary reliance on rabbits— themselves overhunted and slammed by disease.
于是资源与种群增长构成一个反馈调节环。
Therefore, the resources and population increase form a feedback loop.
尽管目击者口中的“大脚”数以千计、足以构成一个繁殖种群，人们却连一具尸体也未曾找到。
Despite the thousands of Bigfoot that must exist for a breeding population, not a single body has been found.
本文以蚕豆和蚕豆蚜构成的人工种间关系系统为对象，研究了蚜虫种群动态和植物生理变化的关系。
The Experiments were carried out to study the relationship dynamics of Aphis craccivora population and Vicia faba between physiological stress on the basis of plant-insect experimental system.
调查结果基本反映了本口岸地区蝇类构成，弥补了济宁口岸蝇类种群资料的空白。
The results generally reacted Jinxing ports flies constitute, making up for Jining port empty flies data.
该系统是由一个捕食者，二个食饵种群所构成。
The system has three species, where two prey and one predator.
方法采用夹夜法调查鼠类种群数量，采用统计学方法对群落构成进行分析。
Methods Trap-at-night method was used to estimate the size of rodent community, and its structure was analyzed with statistical method.
方法从2006—2010年，采用夹夜法对大榭口岸的鼠类种群的构成、密度、季节消长情况进行了调查。
Methods The night trapping method was used to systemically monitor the species composition and seasonal density fluctuation of rodents at Daxie port from Jan. 2006 to Dec. 2010.
方法从2006—2010年，采用夹夜法对大榭口岸的鼠类种群的构成、密度、季节消长情况进行了调查。
Methods The night trapping method was used to systemically monitor the species composition and seasonal density fluctuation of rodents at Daxie port from Jan. 2006 to Dec. 2010.
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