ECOSYSTEMS. “Computer viruses exhibit “species” with well-defined ecological niches based on host machine type and variations within these species. These species are adapted to specific environments and will not survive if moved to a different environment.”
https://books.google.com/books?id=qErpoKjc1h4C&pg=PA261&lpg=PA261&dq=computer+virus+metabolism&source=bl&ots=NWmF_p3xqj&sig=XEfXy2VQZdbYQgBJSndUVHbkDSI&hl=en&sa=X&ved=0ahUKEwi51qLC35fLAhUBcj4KHQW-B9AQ6AEIFzAE