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

多倍当作引起同一地区并存的种发生种形成事件的一种机制。

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

首先，因地理隔离或其它一些机制导致种形成（种分裂或系枝进化）。

This conclusion agress with the viewpoint that this species is on the speciation stage of migration towards north.

这一结论支持该种目前正处于向北迁移的分化阶段的观点。

Jolley(1993)is a study of dissolved phosphorus speciation in the lower molongolo sewage treatment plant(Canberra, Australia)detected no triphosphate in raw sewage entering the plant.

Jolley(1993)进行得一项研溶解磷形态下molongolo污水处理厂（堪培拉，澳大利亚）未发现任何未经处理得污水有三磷酸盐进入工厂。