I am an ecologist writing a paper about disturbed forests (i.e. forests that are affected by things like forest fires, insects, and pathogens). It is common in my field to use the term "material legacy" to describe "stuff" that is left behind after a disturbance (like the seeds that remain after a wild fire). The word "legacy" implies that the materials in question existed pre-disturbance and then persisted afterwards; however, I am trying to come up with a term that describes structures that were not there before the disturbance, but are actually generated by the disturbance.
I've jokingly been using "spawn," but I don't think that will fly in a publication. I've also tested out "material currency" but I'm not sure if that's quite it either. Any ideas?