Population is a group of individuals of the same species that live in the same area.
種羣是佔有一定空間和時間的同一物種個體的集合體。
Community is a group of different populations that live together in a defined area.
羣落是佔有一定空間和時間的多種生物種羣的集合體。
Ecosystem is all the organisms that live in a place,together with their physical environment.
生態系統是指在一定的空間內生物成分和非生物成分通過物質循環和能量流動而相互作用、相互依存而構成的一個生態學功能單位。