A local scale analysis of manganese nodules influence on the Clarion-Clipperton Fracture Zone macrobenthos

Type Article
Date 2021-02
Language English
Author(s) Francesca Pasotti1, Mevenkamp Lisa1, Pape Ellen1, Błażewicz Magdalena3, Bonifácio Paulo4, Riehl Torben5, de Smet Bart2, Lefaible Nene1, Lins Lidia1, Vanreusel Ann1
Affiliation(s) 1 : Marine Biology Laboratory, Ghent University, Ghent, Belgium
2 : Flanders Marine Institute, Oostende, Belgium
3 : Department of Polar Biology and Oceanobiology, University of Lodz, Lodz, Poland
4 : Ifremer, Centre Bretagne, REM EEP, Laboratoire Environnement Profond, ZI de la Pointe du 5 Diable, CS 10070, F-29280, Plouzan, France
5 : Biocenter Grindel & Zoological Museum, University of Hamburg, Hamburg, Germany
Source Deep-sea Research Part I-oceanographic Research Papers (0967-0637) (Elsevier BV), 2021-02 , Vol. 168 , P. 103449 (15p.)
DOI 10.1016/j.dsr.2020.103449
WOS© Times Cited 10

The present investigation focuses on the Global Sea Mineral Resources contract area B4S03 site in the Clarion-Clipperton Fracture Zone nodule fields. We investigated the sedimentary characteristics and the higher-taxon (order/class) and lower-taxon (family, morphospecies) diversity of the soft sediment macrobenthos with special focus on the dominant taxa (Isopoda, Polychaeta, Tanaidacea) in relation to nodule abundance. Across all analyses no consistent and/or significant differences between the two nodule-rich and the nodule free stations were found in terms of abiotic or biotic factors, suggesting that both habitat-types have similar sedimentary conditions and that macrofauna is represented by comparable densities and higher-taxon diversity across stations. Rarefaction/accumulation curves and sample coverage analysis shows that the current sampling effort was insufficient to characterize the B4S03 site diversity at morphospecies level but covered >90% of the diversity at the family level for the three dominant taxa. The high number of singletons encountered, the patchiness and low densities of the investigated taxa coupled to the logistically limited potential for replication per habitat/station, may point to under-sampling bias of the current study with the risk to underestimate species diversity and overestimate endemism. We recommend a more extensive sampling with the combination of molecular tools coupled with taxonomical expertise.

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Francesca Pasotti, Mevenkamp Lisa, Pape Ellen, Błażewicz Magdalena, Bonifácio Paulo, Riehl Torben, de Smet Bart, Lefaible Nene, Lins Lidia, Vanreusel Ann (2021). A local scale analysis of manganese nodules influence on the Clarion-Clipperton Fracture Zone macrobenthos. Deep-sea Research Part I-oceanographic Research Papers, 168, 103449 (15p.). Publisher's official version : https://doi.org/10.1016/j.dsr.2020.103449 , Open Access version : https://archimer.ifremer.fr/doc/00660/77182/