Sea-ice properties and nutrient concentration as drivers of the taxonomic and trophic structure of high-Arctic protist and metazoan communities

Type Article
Date 2019-07
Language English
Author(s) Flores Hauke1, 2, David Carmen1, 2, 3, Ehrlich Julia1, 2, Hardge Kristin1, Kohlbach Doreen1, 2, Lange Benjamin A.1, 2, 4, Niehoff Barbara1, Nöthig Eva-Maria1, Peeken Ilka1, Metfies Katja1, 5
Affiliation(s) 1 : Section Polar Biological Oceanography, Alfred Wegener Institut Helmholtz-Zentrum für Polar- und MeeresforschungBremerhaven, Germany
2 : Centre for Natural History (CeNak), University of Hamburg, Hamburg, Germany
3 : Inst Francais Rech Exploitat Mer Ifremer, Plouzane, France
4 : Fisheries and Oceans Canada,Freshwater Institute,Winnipeg, Canada
5 : Helmholtz Institute for Functional Marine Biodiversity (HIFMB), Oldenburg, Germany
Source Polar Biology (0722-4060) (Springer Science and Business Media LLC), 2019-07 , Vol. 42 , N. 7 , P. 1377-1395
DOI 10.1007/s00300-019-02526-z
WOS© Times Cited 10
Keyword(s) Arctic Ocean, Sea ice, Community structure, Protists, Zooplankton, Under-ice fauna, Nutrients, Trophic ecology
Abstract

In the Arctic Ocean, sea-ice decline will significantly change the structure of biological communities. At the same time, changing nutrient dynamics can have similarly strong and potentially interacting effects. To investigate the response of the taxonomic and trophic structure of planktonic and ice-associated communities to varying sea-ice properties and nutrient concentrations, we analysed four different communities sampled in the Eurasian Basin in summer 2012: (1) protists and (2) metazoans from the under-ice habitat, and (3) protists and (4) metazoans from the epipelagic habitat. The taxonomic composition of protist communities was characterised with 18S meta-barcoding. The taxonomic composition of metazoan communities was determined based on morphology. The analysis of environmental parameters identified (i) a ‘shelf-influenced’ regime with melting sea ice, high-silicate concentrations and low NOx (nitrate + nitrite) concentrations; (ii) a ‘Polar’ regime with low silicate concentrations and low NOx concentrations; and (iii) an ‘Atlantic’ regime with low silicate concentrations and high NOx concentrations. Multivariate analyses of combined bio-environmental datasets showed that taxonomic community structure primarily responded to the variability of sea-ice properties and hydrography across all four communities. Trophic community structure, however, responded significantly to NOx concentrations. In three of the four communities, the most heterotrophic trophic group significantly dominated in the NOx-poor shelf-influenced and Polar regimes compared to the NOx-rich Atlantic regime. The more heterotrophic, NOx-poor regimes were associated with lower productivity and carbon export than the NOx-rich Atlantic regime. For modelling future Arctic ecosystems, it is important to consider that taxonomic diversity can respond to different drivers than trophic diversity.

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Flores Hauke, David Carmen, Ehrlich Julia, Hardge Kristin, Kohlbach Doreen, Lange Benjamin A., Niehoff Barbara, Nöthig Eva-Maria, Peeken Ilka, Metfies Katja (2019). Sea-ice properties and nutrient concentration as drivers of the taxonomic and trophic structure of high-Arctic protist and metazoan communities. Polar Biology, 42(7), 1377-1395. Publisher's official version : https://doi.org/10.1007/s00300-019-02526-z , Open Access version : https://archimer.ifremer.fr/doc/00505/61681/