TABLE 2

Average percent difference in relative abundance between endospore-enriched samples and nonenriched controls across the three age categories

TaxonFamilyDifferencea (%)
19,000 yrU value27,000 yrU value33,000 yrU value
ActinobacteriaMicrococcaceae2.4 ± 0.5b00.0 ± 0.09.50.0 ± 0.011
Solirubrobacteraceae1.5 ± 0.430.6 ± 0.340.1 ± 0.15
Gaiellaceae1.0 ± 0.3c1−0.2 ± 0.180.1 ± 0.18.5
BacilliPlanococcaceae2.4 ± 0.94−8.5 ± 1.0c14.0 ± 2.68
Thermoactinomycetaceae0.4 ± 0.1c020 ± 2.5c27.8 ± 2.26
Bacillaceae0.7 ± 0.1c0−2.5 ± 1.281.0 ± 0.49
Paenibacillaceae2.5 ± 0.4c00.4 ± 1.6125.6 ± 2.74
ClostridiaClostridiaceae3.1 ± 0.4b0−2.5 ± 1.55−9.2 ± 1.2b0
  • a A negative value shows underrepresentation in the endospore-enriched samples compared to the nonenriched controls, while a positive value shows overrepresentation. The values are averages of five replicate cores. The U value is a test statistic generated by a Mann-Whitney-Wilcoxon test that represents the level of difference between two groups. Lower U values indicate that two groups are more different.

  • b P < 0.01 (Mann-Whitney-Wilcoxon test).

  • c P < 0.05 (Mann-Whitney-Wilcoxon test).