VARNUM NAME LABEL TYPE LENGTH 1 SITE_ID NLA Site Identifier 2 25 2 VISIT_NO Within-year Sample Visit Number 1 3 SAMPLE_CATEGORY "Sample category (P=Primary sample, D=Field Duplicate sample)" 2 4 4 OTU_OE5 Operational Taxonomic Unit assigned for O/E Indicator 2 40 5 ABUND_OE5 Number of cells/mL (phytoplankton OTUs) or number of individuals/mL (zooplankton OTUs) 1