it may be an ecosytem, that is not coplete in the possession of either the living part (producer, consumers, and decomposers)or non-living part (i.e light, temperature,soil, air and water etc).
Ecosystems do not have to be completely the same throughout, they can have regional variations. So an ecosystem within an ecosystem is much like a neighborhood within a city.
An Eco-system isn't something that is alive. It is something where living species can depend on each other.An Eco-system can not live inside another Eco-system
An ecosystem is a community of...
parts of ecosystems may be in another ecosystem, like say a evergreen pine tree was covered in water , or the land was flooded, that would be a part of land-based ecosystem in an aquatic ecosystem.