MEDUSA: Marine benthic Ecological Data from Underwater imagery Surveys of sub-Antarctic Crozet environments

Lelièvre, Y.; Motreuil, S.; Specq, L.; Marschal, C.; Dubois, P.; Wauters, L.; Guéné, M.; Saucède, T.

doi:/10.1038/s41597-024-03460-4

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MEDUSA: Marine benthic Ecological Data from Underwater imagery Surveys of sub-Antarctic Crozet environments

Lelièvre, Y.; Motreuil, S.; Specq, L.; Marschal, C.; Dubois, P.; Wauters, L.; Guéné, M.; Saucède, T. (2024). MEDUSA: Marine benthic Ecological Data from Underwater imagery Surveys of sub-Antarctic Crozet environments. Scientific Data 11(1): 613. https://dx.doi.org/10.1038/s41597-024-03460-4

In: Scientific Data. Nature Publishing Group: London. ISSN 2052-4463; e-ISSN 2052-4463

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VLIZ: Open access 414139 [ download pdf ]

Keyword

Marine/Coastal

Author keywords

SOUTHERN-OCEAN;ISLANDS;COMMUNITIES;DISTURBANCE;TRENDS

Authors		Top
Lelièvre, Y. Motreuil, S. Specq, L. Marschal, C.	Dubois, P. Wauters, L. Guéné, M. Saucède, T.

Abstract

Inscribed on the UNESCO World Heritage list, the sub-Antarctic Crozet archipelago is located in a region facing significant environmental changes impacting a poorly known marine biodiversity. Underwater imagery constitutes a valuable non-invasive approach for gathering ecological data and improving our knowledge of ecosystems’ vulnerability. We here compiled two datasets, encompassing 17 video-imagery surveys of Crozet nearshore environments conducted in 2021 and 2022 at two sites of Ile de la Possession: Baie du Marin and Crique du Sphinx. Faunal abundance and algal cover data related to each survey are also provided. A total of 755 images were analysed, comprising 52 faunal and 14 algal taxa identified in 2021, as well as 45 faunal and 14 algal taxa identified in 2022. Video-transects were performed in shallow waters by scuba divers using a GoPro®HERO7 multiple camera set-up, and in deeper waters using a remotely operated vehicle. These data provide a first baseline for biodiversity and ecosystem studies, and for monitoring the long-term dynamics of Crozet benthic habitats facing natural and anthropogenic disturbances.

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