First, there is speciation (species-splitting or cladogenesis), caused by geographical isolation or some other mechanism.

首先，隔离或其它一些机制导致物种形成（物种分裂或系枝进化）。

Polyploidy is a mechanism often attributed to causing some speciation events in sympatry.

多倍性常被当作引起在同一区并存物种发生物种形成事件一种机制。

Many types of animal have now vanished from the earth.

许多动物物种现已从球上绝迹。

That species disappeared in the Ice Age.

那个物种早在冰河时期就绝迹了。

This island is maintained as a sanctuary for endangered species.

那个岛继续作为濒危物种保护区。

LIN Yu-chang Area Serai, intertwined vines and plant species richness.

景区林郁苍茏，藤蔓交织，植物物种丰富。

The book described the adaptation of desert species to the hot conditions.

这本书描绘了沙漠物种对炎环境适应。

14 per cent of primate species are highly endangered.

14% 灵长类物种处于高度濒危状态。

It is believed that this differential toxicity is due to species-specific toxicokinetics.

据认为，这一差别毒性是由于物种毒。

The rabbit is a relatively recent introduction in Australia.

兔子是相对较新引入澳大利亚物种。

The Antarctic species have few special adaptations for polar life.

南极物种对极生活几乎没有什么特别适应性改变。

The phylogenic tree of TFL1 homologs is almost accordance with the relative of those plants.

TFL1 蛋白系统发育树基本符合物种亲缘关系。

The arrival of this South American predator threatened the survival of native species.

这种南美肉食动物到来威胁到了当物种生存。

In the stream with strong bed load movement there is no benthic macroinvertebrate.

河势散乱且河床运动剧烈物种丰度和密度均很低甚至为零，生态条件差。

Differential toxicity is seen in different animal models.It is believed that this differential toxicity is due to species-specific toxicokinetics.

不同物种摄入同种有毒物质效果是不同，毒性强度与该物种毒代动力学密切相关。

In contrast to homoploid hybrid species,polyploid species are easily diagnosed because of chromosome number changes associated with genome doubling.

与同倍杂合体物种相比，为与基组加倍相关染色体数目变化,多倍杂合体物种很容易判断。

The community has an outstanding dominant species and the arborous layer possesses a comparatively high diversity index.

群落优势种显著，乔木层物种多样性指数较高，各样间植物种类具有一定相似性。

It is spread by the bite of an infected tsetse fly (Glossina Genus), a species native to the African continent.

它通过非洲大陆当特有物种即受感染采采蝇（舌蝇属）叮咬传播。

The laws are designed to protect endangered species like badgers and otters, whose fur used to be favoured by sporran makers.

这项法律是为了保护獾与水獭等濒危物种，过去毛皮袋制作者喜欢使用牠们毛皮。

Safe for the moment from predaceous leopard seals, chinstrap penguins are the second most abundant species in Antarctica and the sub-Antarctic.

可以暂时安全防备海豹猎杀，帽企鹅是第二最多丰富物种在南极洲和亚南极洲。