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Table 2 Read and OTU distribution of the samples obtained through next generation sequencing (Illumina), diversity indices (calculated using QIIME workflow) and taxonomical distribution

From: Petroleum hydrocarbon rich oil refinery sludge of North-East India harbours anaerobic, fermentative, sulfate-reducing, syntrophic and methanogenic microbial populations

  GR1 GR3 DB2
Parameters
 Number of reads 627,638 435,940 472,180
 OTUs (97% identity) 7837 12,774 10,617
 Estimated total OTUs (Chao1) 15,448.14 32,314.94 25,135.21
 Shannon diversity index 6.148 4.443 6.369
 Simpson index 0.9452 0.7081 0.95
 Equitability 0.475 0.326 0.476
 Goods coverage 0.9933 0.9819 0.9863
 Archaeal taxa (% Reads) 0.03 0.0002 0.02
 Bacterial taxa (% Reads) 95.41 99.14 97.07
 Unclassified (% Reads) 4.56 0.86 2.91
Number of Archeal taxa detected
 Phylum 2 1 2
 Class 3 1 5
 Family 2 1 3
 Genus 2 1 3
 Genus e 2 2 2
 Genus common in 3 samples 1   
Number of Bacterial taxa detected
 Phylum 49 46 49
 Class 118 96 116
 Family 213 186 215
 Genus 280 244 285
 Genus common in 3 samples 139
  1. eDetected through clone library