Bacteriophages (phages), potentially the most numerous "organisms" on Earth, are the viruses of bacteria (more generally, of prokaryotes[1]). Phage ecology is the study of the interaction of bacteriophages with their environments.[2]
The Dismantling of Bacteriology and a Deconstruction of the Procaryote
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(help); see also pp. 103–4 of
Sapp, Jan (2004). "Evolving biological organization". Microbial phylogeny and evolution: concepts and controversies. Oxford [Oxfordshire]: Oxford University Press. pp. 99–118. ISBN 978-0-19-516877-8.