Table 4.
Total number and percentage of OTUs within each taxonomic group exhibiting one of four responses to decreasing pH
| Response to reduced pH |
||||||
| Taxa | A (Decrease) | B (Decrease in extreme low only) | C (No trend) | D (Increase) | E (Rare) | Total |
| Gastropod | 1 (0.04) | 7 (0.26) | 1 (0.04) | 0 (0) | 18 (0.67) | 27 |
| Bivalve | 0 (0) | 3 (0.30) | 2 (0.20) | 0 (0) | 5 (0.50) | 10 |
| Decapod | 4 (0.22) | 7 (0.39) | 0 (0) | 0 (0) | 7 (0.39) | 18 |
| Amphipod | 3 (0.10) | 2 (0.07) | 8 (0.26) | 8 (0.26) | 10 (0.32) | 31 |
| Tanaid | 2 (0.29) | 0 (0) | 2 (0.29) | 1 (0.14) | 2 (0.29) | 7 |
| Isopod | 3 (0.38) | 1 (0.13) | 1 (0.13) | 1 (0.13) | 2 (0.25) | 8 |
| Polychaete | 20 (0.47) | 0 (0) | 5 (0.12) | 3 (0.07) | 15 (0.35) | 43 |
| Sipunculid | 3 (0.75) | 0 (0) | 0 (0) | 0 (0) | 1 (0.25) | 4 |
The responses to reduced pH are split into five categories: A, a gradual decrease in abundance from ambient to extreme low pH; B, a sudden decrease in abundance in low or extreme low pH (i.e., a threshold response); C, no trend in the abundance; D, increased abundance from ambient to extreme low pH; E, the taxa were too rare to illustrate a trend. The number of OTUs is indicated, and the proportion is given in parentheses.