Patterns of mesozooplankton community composition and vertical fluxes in the global ocean

Type Article
Date 2022-01
Language English
Author(s) Soviadan Yawouvi Dodji1, 6, Benedetti Fabio2, Brandao Manoela CORCID1, 3, Ayata Sakina-Dorothée1, 7, Irisson Jean-Olivier1, Jamet Jean Louis5, Kiko Rainer1, Lombard Fabien1, 4, Gnandi Kissao6, Stemmann Lars1
Affiliation(s) 1 : Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, 06230 Villefranche-sur-mer, France
2 : Environmental Physics, Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, Universitätstrasse 16, 8092 Zürich, Switzerland
3 : Institut Français de Recherche pour l'Exploitation de la Mer, Centre Bretagne, 29280 Plouzané, France
4 : Institut Universitaire de France (IUF), Paris, France
5 : Université de Toulon, Mediterranean Institute of Oceanology (MIO), AMU-UTLN UM110, Equipe EMBIO, CS 60584, 83041 TOULON Cedex 9, France
6 : Département de Géologie, Université de Lomé, Togo
7 : Sorbonne Université, CNRS, IRD, MNHN, Laboratoire d'Océanographie et du Climat: Expérimentations et Approches Numériques (LOCEAN-IPSL), Paris, France
Source Progress In Oceanography (0079-6611) (Elsevier BV), 2022-01 , Vol. 200 , P. 102717 (13p.)
DOI 10.1016/j.pocean.2021.102717
WOS© Times Cited 11
Keyword(s) Zooplankton, Biological carbon pump, Epipelagic, Mesopelagic, Community structure, Particle flux, Attenuation rates, Oxygen Minimum Zone
Abstract

Vertical variations in physical and chemical conditions drive changes in marine zooplankton community composition. In turn, zooplankton communities play a critical role in regulating the transfer of organic matter produced in the surface ocean to deeper layers. Yet, the links between zooplankton community composition and the strength of vertical fluxes of particles remain elusive, especially on a global scale. Here, we provide a comprehensive analysis of variations in zooplankton community composition and vertical particle flux in the upper kilometer of the global ocean. Zooplankton samples were collected across five depth layers and vertical particle fluxes were assessed using continuous profiles of the Underwater Vision Profiler (UVP5) at 57 stations covering seven ocean basins. Zooplankton samples were analysed using a Zooscan and individual organisms were classified into 19 groups for the quantitative analyses. Zooplankton abundance, biomass and vertical particle flux decreased from the surface to 1000 m depth at all latitudes. The zooplankton abundance decrease rate was stronger at sites characterised by oxygen minima (<5µmol O2.kg−1) where most zooplankton groups showed a marked decline in abundance, except the jellyfishes, molluscs, annelids, large protists and a few copepod families. The attenuation rate of vertical particle fluxes was weaker at such oxygen-depleted sites. Canonical redundancy analyses showed that the epipelagic zooplankton community composition depended on the temperature, on the phytoplankton size distribution and the surface large particulate organic matter while oxygen was an additional important factor for structuring zooplankton in the mesopelagic. Our results further suggest that future changes in surface phytoplankton size and taxa composition and mesopelagic oxygen loss might lead to profound shift in zooplankton abundance and community structure in both the euphotic and mesopelagic ocean. These changes may affect the vertical export and hereby the strength of the biological carbon pump.

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Soviadan Yawouvi Dodji, Benedetti Fabio, Brandao Manoela C, Ayata Sakina-Dorothée, Irisson Jean-Olivier, Jamet Jean Louis, Kiko Rainer, Lombard Fabien, Gnandi Kissao, Stemmann Lars (2022). Patterns of mesozooplankton community composition and vertical fluxes in the global ocean. Progress In Oceanography, 200, 102717 (13p.). Publisher's official version : https://doi.org/10.1016/j.pocean.2021.102717 , Open Access version : https://archimer.ifremer.fr/doc/00740/85173/