Impacts of a novel shellfishing gear on macrobenthos in a marine protected area: pump-scoop dredging in Poole Harbour, UK

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Table 8

Mean (±95% C.I.) diversity and biotic indices (AMBI: AZTI Marine Biotic Index; BO2A: Benthic Opportunistic Annelid Amphipods) for each site in June and November 2015. Significant changes over time are highlighted in bold. Thresholds for each biotic indices are included below.

Site	Species richness		Simpson		Shannon-Wiener		AMBI		BO2A

	June	Nov	June	Nov	June	Nov	June	Nov	June	Nov
Control	5.33 ± 0.71	6.29 ± 0.60	0.87 ± 0.22	0.88 ± 0.02	1.56 ± 0.13	1.73 ± 0.10	3.36 ± 0.24	3.52 ± 0.24	0.05 ± 0.02	0.06 ± 0.02
Newly Opened	5.83 ± 0.79	7.88 ± 0.88	0.86 ± 0.02	0.87 ± 0.02	1.63 ± 0.12	1.87 ± 0.12	4.02 ± 0.25	3.81 ± 0.24	0.12 ± 0.06	0.11 ± 0.04
Heavy Dredging	7.33 ± 0.75	8.13 ± 1.29	0.86 ± 0.03	0.84 ± 0.08	1.80 ± 0.12	1.83 ± 0.21	4.06 ± 0.27	4.01 ± 0.27	0.16 ± 0.06	0.16 ± 0.06

AMBI Disturbance Thresholds: <1.2 = undisturbed; 1.2 ≤ 3.3 = slightly disturbed; 3.3 ≤ 5.0 = moderately disturbed; 5.0 ≤ 6.0 = heavily disturbed; 6.0 ≤ 7.0 = extremely disturbed.

BO2A Quality Status: <0.025 = high; 0.025−0.130 = good; 0.130−0.199 = moderate; 0.199−0.255 = poor, >0.255 = bad.

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