Table 1. Alpha diversity measurements at Río Tinto samples and sites.
| Samples | Number of tags | Number of OTUs | ACE | Chao1 (95% CIs) |
| AG1.2 | 485 | 77 | 210* | 197*(133–326) |
| AG1.3 | 62 | 18 | 38 | 80(29–394) |
| AG2.1 | 291 | 44 | 149 | 136*(82–285) |
| AG2.2 | 116 | 15 | 45 | 35(22–93) |
| AG2.3 | 719 | 43 | 153 | 170*(89–419) |
| AG3.1 | 704 | 63 | 140 | 159*(105–294) |
| AG3.2 | 478 | 76 | 205* | 220*(145–382) |
| AG3.3 | 624 | 101 | 274 | 251*(181–388) |
| BE1.1 | 543 | 87 | 332* | 354*(207–688) |
| BE1.2 | 308 | 37 | 86 | 80*(55–152) |
| BE1.3 | 59 | 17 | 29 | 43*(23–141) |
| BE2.1 | 719 | 52 | 196* | 148*(91–294) |
| BE2.3 | 462 | 68 | 333* | 252*(151–486) |
| BE3.1 | 376 | 53 | 153 | 152*(95–298) |
| BE3.3 | 760 | 43 | 132 | 112*(70–232) |
| OR1.1 | 672 | 103 | 373 | 356(231–610) |
| OR1.2 | 334 | 57 | 115* | 119(91–177) |
| OR2.1 | 551 | 72 | 235* | 201*(135–341) |
| OR2.2 | 344 | 40 | 96 | 160(80–438) |
| OR2.3 | 451 | 76 | 219 | 202(138–345) |
| OR3.1 | 776 | 90 | 383 | 308(200–530) |
| OR3.3 | 695 | 51 | 123* | 116*(86–175) |
| Sites | ||||
| AG1 | 547 | 83 | 231 | 211(141–363) |
| AG2 | 1126 | 81 | 399 | 268*(164–500) |
| AG3 | 1806 | 167 | 401 | 432(315–642) |
| BE1 | 879 | 112 | 461* | 312*(216–496) |
| BE2 | 910 | 99 | 275* | 277*(186–462) |
| BE3 | 1136 | 78 | 217* | 152*(112–237) |
| OR1 | 1006 | 129 | 370* | 310*(227–462) |
| OR2 | 1246 | 130 | 346 | 328*(234–505) |
| OR3 | 1471 | 110 | 222* | 254*(184–391) |
Number of tags, number of OTUs, and ACE and Chao1 non-parametric richness estimators arranged for each sample (top) and for pooled samples by site (bottom). The asterisk indicates estimators that plateau at a given number of OTUs.