Bacteria can exchange plasmids with bacteria of other species, including some apparently distantly related ones in different phylogenetic domains, making analysis of their relationships difficult, and weakening the concept of a bacterial species.
Bakteri prasida matukar plasmid sareng spesies tiosan, taler wénten makudang-kudang sané kantung madué paiketan ring domain filogenetik sané matiosan, makarya panyelehan indik paiketan ipun sayan sukil, miwah pacang ngreredang konsep indik spesies bakteri.