Characterization of coastal habitats and marine benthic communities of the sub-Antarctic Crozet archipelago using underwater imagery Author Lelièvre, Yann Author Gall, Line Le Author Dubois, Philippe Author Saucède, Thomas text Antarctic Science 2025 Cambridge, England 2025-02-25 37 3 134 153 https://doi.org/10.1017/s0954102024000543 journal article 10.1017/S0954102024000543 1365-2079 15817000

Table III. Species richness and diversity indices of faunal and algal communities for each transect conducted at Baie du Marin (BDM) and Crique du Sphinx (CdS). Diversity indices are taxonomic richness (R), rarefied taxonomic richness (R rar), Shannon diversity (N), rarefied Shannon diversity (N rar), Simpson diversity (1/ λ), rarefied Simpson diversity (1/ λ rar) and Pielou’s evenness (J ’). The sampling effort is also provided with regards to the number of images analysed (n image), transect total surface (TTS) and the mean image surface (IS).

Transect	Site	R	R rar	N	N rar	1/ λ	1/ λ rar	J ’	n image	TTS (m2)	IS (m2) mean ± SD
Fauna
(Continued)
a Rarefied to 58 individuals. b Rarefied to 433 individuals. c Rarefied to 58 individuals. d Rarefied to 2172 individuals. e Rarefied to 4 images. f Rarefied to 52 images. g Rarefied to 92 images. h Rarefied to 144 images. i Rarefied univariate measures for algae were estimated from presence-absence data.
BDM-T1	BDM	30	13a	10.084	8.245a	6.818	6.225a	0.679	97	125.42	1.3 ± 0.5
BDM-T2	BDM	9	5a	2.773	2.615a	2.080	2.047a	0.464	78	91.98	1.2 ± 0.6
BDM-T3	BDM	18	6a	3.769	3.448a	2.824	2.739a	0.459	14	12.50	0.9 ± 0.8
BDM-T4	BDM	2	1a	1.029	1.023a	1.009	1.009a	0.042	46	5.11	0.1 ± 0.1
BDM-T5	BDM	7	4a	1.943	1.865a	1.461	1.451a	0.341	61	53.74	0.9 ± 0.6
BDM-T6	BDM	4	2a	1.235	1.211a	1.093	1.092a	0.152	61	5.69	0.1 ± < 0.1
BDM-T7	BDM	11	7a	3.810	3.539a	2.870	2.791a	0.558	89	49.13	0.6 ± 0.5
BDM-T8	BDM	10	6a	1.965	1.829a	1.349	1.342a	0.293	4	0.43	0.1 ± < 0.1
BDM - Shallow	BDM	37	33b	8.251	8.206b	5.413	5.407b	0.584	189	229.90	1.2 ± 0.6
BDM - Deep	BDM	17	10c	3.570	3.363c	2.541	2.510c	0.449	261	114.10	0.4 ± 0.5
Baie du Marin	BDM	43	37 d	10.057	9.702 d	7.080	7.067 d	0.614	450	344.00	0.8 ± 0.7
CdS-T1	CdS	24	10a	5.731	4.973a	3.798	3.631a	0.549	32	44.94	1.4 ± 0.7
CdS-T2	CdS	25	11a	6.719	5.825a	3.818	3.654a	0.592	20	30.32	1.5 ± 0.6
CdS-T3	CdS	6	6a	2.815	2.812a	2.363	2.362a	0.578	37	2.30	0.1 ± < 0.1
CdS-T4	CdS	5	5a	1.505	1.505a	1.195	1.195a	0.254	55	4.84	0.1 ± 0.1
CdS - Shallow	CdS	31	31b	6.760	6.760b	4.432	4.432b	0.557	52	75.26	1.5 ± 0.6
CdS - Deep	CdS	7	7c	2.598	2.598c	1.970	1.970c	0.491	92	7.14	0.1 ± 0.1
Crique du Sphinx	CdS	35	35 d	7.898	7.898 d	4.915	4.915 d	0.581	144	82.40	0.6 ± 0.8
Total	Both	51	-	12.093	-	8.326	-	0.634	594	426.40	0.7 ± 0.7
Algae
BDM-T1	BDM	10	5e,i	6.102	4.790e,i	4.300	4.362e,i	0.785	97	125.42	1.3 ± 0.5
BDM-T2	BDM	8	4e,i	4.612	3.862e,i	3.715	3.516e,i	0.735	78	91.98	1.2 ± 0.6
BDM-T3	BDM	10	7e,i	3.810	5.844e,i	2.736	5.176e,i	0.581	14	12.50	0.9 ± 0.8
BDM-T4	BDM	0	0	0	0	0	0	0	46	5.11	0.1 ± 0.1
BDM-T5	BDM	0	0	0	0	0	0	0	61	53.74	0.9 ± 0.6
BDM-T6	BDM	0	0	0	0	0	0	0	61	5.69	0.1 ± < 0.1
BDM-T7	BDM	0	0	0	0	0	0	0	89	49.13	0.6 ± 0.5
BDM-T8	BDM	2	2e,i	1.230	2e,i	1.111	2e,i	0.298	4	0.43	0.1 ± < 0.1
BDM - Shallow	BDM	11	10f,i	7.027	8.288f,i	5.109	7.305f,i	0.813	189	229.90	1.2 ± 0.6
BDM - Deep	BDM	2	1g,i	1.230	0.692g,i	1.111	0.425g,i	0.298	261	114.10	0.4 ± 0.5
Baie du Marin	BDM	13	11 h,i	7.062	8.504 h,i	5.117	7.409 h,i	0.762	450	344.00	0.8 ± 0.7
CdS-T1	CdS	9	6e,i	5.437	5.151e,i	4.338	4.677e,i	0.771	32	44.94	1.4 ± 0.7
CdS-T2	CdS	10	7e,i	5.804	6.101e,i	4.706	5.565e,i	0.764	20	30.32	1.5 ± 0.6
CdS-T3	CdS	2	0e,i	1.682	0.472e,i	1.509	0.450e,i	0.750	37	2.30	0.1 ± < 0.1
CdS-T4	CdS	0	0	0	0	0	0	0	55	4.84	0.1 ± 0.1
CdS - Shallow	CdS	11	11f,i	6.337	7.412f,i	5.158	6.476f,i	0.770	52	75.26	1.5 ± 0.6
CdS - Deep	CdS	2	2g,i	1.682	1.649g,i	1.509	1.471g,i	0.750	92	7.14	0.1 ± 0.1
Crique du Sphinx	CdS	13	13 h,i	6.356	8.140 h,i	5.162	6.878 h,i	0.721	144	82.40	0.6 ± 0.8
Total	Both	14	-	8.274	-	6.579	-	0.801	594	426.40	0.7 ± 0.7