What is the difference between the concepts of ecosystem and biogeocenosis?

For the most part, the concepts of ecosystem and biogeocenosis are synonymous. Both denote a stable set of all species in a certain area, their relationship with each other and the influence of abiotic factors (that is, light, temperature, etc.) on them. However, the biogeocenosis has certain dimensions. As a rule, a biogeocenosis can be a specific forest, desert, lake or sea. While the definition of an ecosystem does not have a certain size. It can be both the world’s oceans and a drop of water with bacteria living there.