On the fallen leaves of birch. Also T.populina on the fallen aspen leaves this morning
*Operational taxonomic unit
From Wikipedia, the free encyclopedia
In phylogeny an operational taxonomic unit (OTU) is an operational definition of a species or group of species often used when only DNA sequence data is available. It is the most commonly used microbial diversity unit.
The definition given by NCBI is:
"Taxonomic level of sampling selected by the user to be used in a study, such as individuals, populations, species, genera, or bacterial strains."
"Operational taxonomic unit, species distinction in microbiology. Typically using rRNA and a percent similarity threshold for classifying microbes within the same, or different, OTUs"
The number of OTUs defined may be inflated due to errors in DNA sequencing.