What characterizes a closed community?

A closed community is characterized primarily by sharp boundaries that separate it from surrounding environments. These boundaries can be physical, such as mountains, rivers, or human-made structures, or they can be biological, where specific communities have distinct compositions of species that do not significantly overlap with other areas. The presence of these sharp boundaries contributes to the stability of species interactions within the closed community, limiting the influx of new species and external influences.

In contrast, other characteristics such as high biodiversity or frequent migrations do not align with the concept of a closed community. High biodiversity typically suggests an open system where species can enter and exit freely, while frequent migrations imply movement in and out of the community, which is contrary to the stability and isolation characteristic of closed communities. Hence, sharp boundaries are key to understanding and defining what denotes a closed community.