The polar region is the habitat of the polar bear.

北极带为北极熊栖息。

Forests are important habitats for birds and, in temperate forests, small mammals which inhabit the dense understorey.

森林对鸟类来说是重要栖息，而且在温带森林里，小型哺乳物居住在稠密森林下层。

This creature’s natural habitat is the jungle.

这种物栖息是丛林。

Ecodeme refers to a deme occuring within a specified kind of habitat.

生态同群种是指出现于某种特殊生境内同群种。

Dipus sagitta showed a high density and was dominant in desert-type habitats, especially in sand dune.

聚类分析结果显示, 研究区物群落可以分成荒漠型群落和绿洲型群落两大类。

Habitat loss and fragmentation is the primary cause of population, metapopulation and species extinction worldwide.

生境丧失和破碎化是生物多样性丧失主要原因，并得到了广泛关注。

To select an optimum extracting technique of Pachman and determine its content in Poria peels from different habitats.

优选茯苓皮中茯苓聚糖提取工艺,测定不同产茯苓皮中茯苓聚糖含量。

Across Europe, the biggest declines from 1990 to 2000 had been for bogs and fenland, heathland and coastal habitats.

在欧洲，1990至2000年间减少最多要属沼，和一些海岸栖。

Mosquito fish had large habitat niches, rapid growth rate, ovoviviparity, high reproduction rate and large adaptation reproduction conditions.

它们具有广泛生境适应性、生长迅速、卵胎生、高生殖率、对生殖生态条件无特殊要求等特点。

Adaptedness is the state of being adapted: the degree to which an organism is able to live and reproduce in a given set of habitats.

业已适应是指正在适应状态，即在一组给定栖息上，有机体达到能够生存和繁殖时适应程度。

(3) Uncia uncia prefer to inhabit in the rugged habitats with moderate shrubberies, and they also like to leave signs in valley bottoms rather than hillsides.

此外，雪豹还倾向于在谷底而不是山坡活。

They are the most widespread and abundant equid in the world today, although their welfare depends on conservation programs aimed at maintaining their habitat and preventing overhunting.

草原斑马是现今世界上数量最多、分布最广马科物，而这有赖许多致力于保护栖境、阻止猎捕保育计画。

The results showed that a mixed mating system was possibly the main heterogamy of this species, and its endangerment was caused by over-exploitation and habitat loss.

导致荷叶铁线蕨濒危主要原因是生境破坏以及过度开采所导致生境片断化使其居群变小、近交率加大、遗传变异趋低，降低了其生存以及进化潜力。

The change trend was influenced by several reasons such as the aquatic habitat, the ecological characteristics of fish, the community structure of digenetic trematodes and import of live fish.

这种变化趋势受多种因素影响，即水环境特点、鱼类生态习性、复殖吸虫群落结构、活物运输等。

The aquafarm was the most important waterbird habitat in Hangzhou, and the West Lake and the pond area were also important in maintaining the diversity and density of waterbirds in Hangzhou.

水产养殖场是杭州市 水乌最重要栖息类型，西湖和水荡对于维持杭州市水鸟数量和多样性也具有重要作用.

The lowest cell density was found in duodenum.The origin of distributive mode of argyrophil cells in the digestive tract of Takydromus wolteri might be related to its habitat and feeding habit.

且嗜银细胞形态多样，主要有锥体形、椭圆形等广泛分布于上皮细胞基部、上皮细胞之间、腺泡上皮及腺泡之间，且多数嗜银细胞有明显突起。

Loss of habitat is to blame, specifically, the lack of the pocket of air between snow and ground called the “subnivean space.” There lemmings winter and give birth to prodigious litters of young.

生存环境缩小是一个原因，更主要是它们在冰雪和面之间被称为“雪下空间”里得不到保护，有些旅鼠会在冬天生下数量惊人却无法存活小旅鼠。