Table 3. Shannon diversity (H′) and Pielou’s evenness (J′) for the entire 4 min UBAT sampling period at each depth (mean, n = 4), and maximum Shannon diversity (H′_max) and the time (s) to reach ½ of the maximum diversity (K) calculated from non-linear regression of Shannon diversity at 30s intervals during UBAT profiles.

Depth (m)	H′	J′	H′max (95% CI)	K (95% CI)
1	1.11	0.57	1.19(1.0–1.3)	14.1(0.16–28.1)
20	1.14	0.59	1.09(1.0–1.2)	11.6(5.2–18.1)
40	1.33	0.69	1.69(1.5–1.9)	57.7(33.4–82.0)
60	1.29	0.66	1.47(1.4–1.6)	27.2(15.6–38.7)
80	1.35	0.69	1.42(1.3–1.5)	14.8(7.9–21.8)
100	1.34	0.69	1.50(1.3–1.7)	23.0(4.2–41.8)
120	1.25	0.64	1.42(1.3–1.5)	12.0(5.3–18.6)