The microbes form genetic clusters and ecological clusters. 這些物種由遺傳及生態群叢組成。
Viewing a biological association as a system has at least two advantages. 把一個生物群叢作為一個系統來看到至少有兩個好處。
The appearance of the ecological community can vary depending on the time of year. 生態群落的形態可能會根據一年之內時間的不同而變化。
But most ecological communities stumble along into a mongrel mixture of species that offers no outstanding self-protection to the group as a team. 但是大多數生態群落跌跌撞撞地發展出的雜交混合物種，並未作為一個團體給群落提供突出的自衛能力。
