Drivers of abundance and spatial distribution in Southern Ocean peracarid crustacea

  • The Southern Ocean (SO) continental shelf and deep sea are environments characterised by different benthic communities. Their structure and composition are driven and shaped by different variables: whilst on the continental shelf physical environmental variables are the main drivers shaping faunal abundance, structure and composition, the deep-sea fauna is most problably driven by biological variables such as predation and competition. Among shelf and deep-sea benthic communities, peracarids (e.g. amphipods and isopods) are one of the most dominant groups, showing high levels of abundance and diversity in both environments. Knowledge on their assemblage structure and composition in the SO remains limited, as well as the knowledge of the environmental variables that influence them. Therefore, the aim of our study was to investigate peracarid assemblages from the SO continental shelf and deep sea and to assess the main drivers shaping their assemblage structure along a wide bathymetric gradient (from 160 m to about 6000 m depth) and at a large geographic scale. We analysed the spatial distribution of 183,606 peracarids sampled using an epibenthic sledge (EBS) during nine different expeditions in the SO, covering a latitudinal range of 77° to 41° South. Depth was identified as the main driver shaping peracarid abundance pattern, their assemblage structure from the continental shelf (<1499 m) was dissimilar to that from the deep sea (>1500 m). Also, depth was differently correlated with different peracarid orders: while isopod abundances increased with depth, amphipods and mysids were negatively correlated; no correlation was found with cumaceans and tanaidaceans. The dissimilar peracarid assemblage structure between the SO continental shelf and the SO deep sea can be due to the assumption that there are different driving forces shaping benthic assemblages from these two environments (physical variables on the continental shelf, biological interactions in the deep sea). As a result, we also suggest that environmental changes due to climate change (e.g. temperature, ice coverage, productivity) would have different consequences depending on the bathymetric range considered.
Author:Davide Di FrancoORCiDGND, Katrin Linse, Huw J. Griffiths, Angelika BrandtORCiDGND
Parent Title (English):Ecological indicators
Publisher:Elsevier Science
Place of publication:Amsterdam [u.a.]
Document Type:Article
Date of Publication (online):2021/06/01
Date of first Publication:2021/06/01
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/03/03
Tag:Benthic environment; Depth; Environmental factors; Macrobenthosda; Marine invertebrates
Issue:art. 107832
Page Number:9
First Page:1
Last Page:9
This work was done thanks to the support and funding of the Deutsche Forschungsgemeinschaft (DFG; Br1121/51-1) in the framework of the project Larsen-C PEARL. Katrin Linse and Huw Griffiths are part of the British Antarctic Survey Polar Science for Planet Earth Programme. It was funded by The Natural Environment Research Council (NERC) [NC-Science], and included the funding for the RSS James Clark Ross expeditions JR275 and JR15005. The RSS James Clark Ross expedition JR17003a was funded by the NERC urgency grant NE/R012296/1. Multiyear ice data from 15/10/1978 to 15/03/2019 were obtained from Q20 (grant: REKLIM-2013-04).
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
5 Naturwissenschaften und Mathematik / 59 Tiere (Zoologie) / 590 Tiere (Zoologie)
Licence (German):License LogoCreative Commons - Namensnennung-Nicht kommerziell - Keine Bearbeitung 4.0