Toward a reliable assessment of potential ecological impacts of deep‐sea polymetallic nodule mining on abyssal infauna

Type Article
Date 2021-09
Language English
Author(s) Lins LidiaORCID1, 2, Zeppilli DanielaORCID3, Menot Lenaick3, Michel Loic3, Bonifácio Paulo3, Brandt Miriam4, Pape Ellen1, Rossel SvenORCID2, Uhlenkott Katja2, Macheriotou Lara1, Bezerra Tania Nara1, Sánchez Nuria3, Alfaro‐lucas Joan M.ORCID3, Martínez Arbizu Pedro2, Kaiser Stefanie5, Murakami Chisato6, Vanreusel Ann1
Affiliation(s) 1 : Marine Biology Research Group Ghent University Ghent ,Belgium
2 : German Centre for Marine Biodiversity Research (DZMB) Senckenberg am Meer Wilhelmshaven, Germany
3 : IFREMER, Centre de Bretagne, REM/EEP/LEP, ZI de la pointe du diable Plouzané, France
4 : MARBEC, Univ. Montpellier, Ifremer, CNRS, IRD Sète ,France
5 : Department of Invertebrate Zoology and Hydrobiology University of Lodz Łódź ,Poland
6 : Deep Ocean Resources Development Co., Ltd Tokyo, Japan
Source Limnology and Oceanography: Methods (1541-5856) (Wiley), 2021-09 , Vol. 19 , N. 9 , P. 626-650
DOI 10.1002/lom3.10448
Abstract

The increasing demand for metals is pushing forward the progress of deep-sea mining industry. The abyss between the Clarion and Clipperton Fracture Zones (CCFZ), a region holding a higher concentration of minerals than land deposits, is the most targeted area for the exploration of polymetallic nodules worldwide, which may likely disturb the seafloor across large areas and over many years. Effects from nodule extraction cause acute biodiversity loss of organisms inhabiting sediments and polymetallic nodules. Attention to deep-sea ecosystems and their services has to be considered before mining starts but the lack of basic scientific knowledge on the methodologies for the ecological surveys of fauna in the context of deep-sea mining impacts is still scarce. We review the methodology to sample, process and investigate metazoan infauna both inhabiting sediments and nodules dwelling on these polymetallic-nodule areas. We suggest effective procedures for sampling designs, devices and methods involving gear types, sediment processing, morphological and genetic identification including metabarcoding and proteomic fingerprinting, the assessment of biomass, functional traits, fatty acids, and stable isotope studies within the CCFZ based on both first-hand experiences and literature. We recommend multi- and boxcorers for the quantitative assessments of meio- and macrofauna, respectively. The assessment of biodiversity at species level should be focused and/or the combination of morphological with metabarcoding or proteomic fingerprinting techniques. We highlight that biomass, functional traits, and trophic markers may provide critical insights for biodiversity assessments and how statistical modeling facilitates predicting patterns spatially across point-source data and is essential for conservation management.

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Figure S1. Statistical power of a BACI ANOVA as function of the mean number of individuals per sample and replication. The ANOVA assumes ... 368 KB Open access
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Lins Lidia, Zeppilli Daniela, Menot Lenaick, Michel Loic, Bonifácio Paulo, Brandt Miriam, Pape Ellen, Rossel Sven, Uhlenkott Katja, Macheriotou Lara, Bezerra Tania Nara, Sánchez Nuria, Alfaro‐lucas Joan M., Martínez Arbizu Pedro, Kaiser Stefanie, Murakami Chisato, Vanreusel Ann (2021). Toward a reliable assessment of potential ecological impacts of deep‐sea polymetallic nodule mining on abyssal infauna. Limnology and Oceanography: Methods, 19(9), 626-650. Publisher's official version : https://doi.org/10.1002/lom3.10448 , Open Access version : https://archimer.ifremer.fr/doc/00708/82033/