Table 1. Alpha diversity indices of the three particulate matter groups

Particulate matter group1) Observed OTUs Chao1 Shannon Inverse Simpson
I-NPH (n = 3) 245.33a 253.28a 4.00a 0.75a
I-FPH (n = 3) 268.00a 300.54a 3.49a 0.76a
O-PH (n = 3) 224.67a 233.33a 2.94a 0.62a
Means were compared among the three PM groups using an ANOVA followed by Duncan’s multiple range test.
Means with the same superscript letter represent non-significant differences (p > 0.05).
OTU, operational taxonomic unit; I-NPH, inside the nursery pig house; I-FPH, inside the finishing pig house; O-PH, outside of the pig house.