FN Archimer Export Format
PT J
TI Sea-ice properties and nutrient concentration as drivers of the taxonomic and trophic structure of high-Arctic protist and metazoan communities
BT 
AF Flores, Hauke
   David, Carmen
   Ehrlich, Julia
   Hardge, Kristin
   Kohlbach, Doreen
   Lange, Benjamin A.
   Niehoff, Barbara
   Nöthig, Eva-Maria
   Peeken, Ilka
   Metfies, Katja
AS 1:1,2;2:1,2,3;3:1,2;4:1;5:1,2;6:1,2,4;7:1;8:1;9:1;10:1,5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Section Polar Biological Oceanography, Alfred Wegener Institut Helmholtz-Zentrum für Polar- und MeeresforschungBremerhaven, Germany
   Centre for Natural History (CeNak), University of Hamburg, Hamburg, Germany
   Inst Francais Rech Exploitat Mer Ifremer, Plouzane, France
   Fisheries and Oceans Canada,Freshwater Institute,Winnipeg, Canada
   Helmholtz Institute for Functional Marine Biodiversity (HIFMB), Oldenburg, Germany
C2 INST A WEGENER, GERMANY
   UNIV HAMBURG, GERMANY
   Inst Francais Rech Exploitat Mer Ifremer, Plouzane, France
   MPO, CANADA
   UNIV OLDENBURG, GERMANY
IF 1.728
TC 21
UR https://archimer.ifremer.fr/doc/00505/61681/65628.pdf
   https://archimer.ifremer.fr/doc/00505/61681/65629.pdf
   https://archimer.ifremer.fr/doc/00505/61681/65630.pdf
   https://archimer.ifremer.fr/doc/00505/61681/66204.pdf
LA English
DT Article
DE ;Arctic Ocean;Sea ice;Community structure;Protists;Zooplankton;Under-ice fauna;Nutrients;Trophic ecology
AB 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. 
PY 2019
PD JUN
SO Polar Biology
SN 0722-4060
PU Springer Science and Business Media LLC
VL 42
IS 7
UT 000475570000012
BP 1377
EP 1395
DI 10.1007/s00300-019-02526-z
ID 61681
ER

EF