“A holobiont is an assemblage of a host and the many other species living in or around it, which together form a discrete ecological unit through symbiosis, (though there is controversy over this ‘discreteness’). The components of a holobiont are individual species or bionts, while the combined genome of all bionts is the hologenome.” (Wikipedia)
The holobiont concept was (re-)introduced by Dr. Lynn Margulis in the 1991 book “Symbiosis as a Source of Evolutionary Innovation”
