dc.contributor.author | Monier, A | |
dc.contributor.author | Comte, J | |
dc.contributor.author | Babin, M | |
dc.contributor.author | Forest, A | |
dc.contributor.author | Matsuoka, A | |
dc.contributor.author | Lovejoy, C | |
dc.date.accessioned | 2018-11-16T12:37:56Z | |
dc.date.issued | 2014-10-17 | |
dc.description.abstract | Arctic Ocean microbial eukaryote phytoplankton form subsurface chlorophyll maximum (SCM), where much of the annual summer production occurs. This SCM is particularly persistent in the Western Arctic Ocean, which is strongly salinity stratified. The recent loss of multiyear sea ice and increased particulate-rich river discharge in the Arctic Ocean results in a greater volume of fresher water that may displace nutrient-rich saltier waters to deeper depths and decrease light penetration in areas affected by river discharge. Here, we surveyed microbial eukaryotic assemblages in the surface waters, and within and below the SCM. In most samples, we detected the pronounced SCM that usually occurs at the interface of the upper mixed layer and Pacific Summer Water (PSW). Poorly developed SCM was seen under two conditions, one above PSW and associated with a downwelling eddy, and the second in a region influenced by the Mackenzie River plume. Four phylogenetically distinct communities were identified: surface, pronounced SCM, weak SCM and a deeper community just below the SCM. Distance-decay relationships and phylogenetic structure suggested distinct ecological processes operating within these communities. In the pronounced SCM, picophytoplanktons were prevalent and community assembly was attributed to water mass history. In contrast, environmental filtering impacted the composition of the weak SCM communities, where heterotrophic Picozoa were more numerous. These results imply that displacement of Pacific waters to greater depth and increased terrigenous input may act as a control on SCM development and result in lower net summer primary production with a more heterotroph dominated eukaryotic microbial community. | en_GB |
dc.description.sponsorship | This study was conducted as part of the MALINA Scientific Program led by MB and funded by the French National Research Agency (ANR), INSU-CNRS (Institut National des Sciences de l'Univers – Centre National de la Recherche Scientifique), CNES (Centre National d'Etudes Spatiales) and ESA (European Space Agency). Computing support was provided by CLUMEQ/Compute Canada. Additional funding was provided by the Natural Science and Engineering Council (NSERC) of Canada to CL, and Fond Québécois de Recherches Nature et Technologies (FQRNT) for Québec Océan, and is a contribution to ArcticNet. AF, AMa and AMo received scholarships from the Canadian Excellence Research Chair (CERC) in remote sensing of Canada’s new Arctic frontier, and JC was supported by FQRNT and the EnviroNorth (CREATE program from NSERC). | en_GB |
dc.identifier.citation | Vol. 9, pp. 990 - 1002 | en_GB |
dc.identifier.doi | 10.1038/ismej.2014.197 | |
dc.identifier.uri | http://hdl.handle.net/10871/34792 | |
dc.language.iso | en | en_GB |
dc.publisher | Springer Nature for International Society for Microbial Ecology | en_GB |
dc.relation.url | https://www.ncbi.nlm.nih.gov/pubmed/25325383 | en_GB |
dc.rights | © 2014 The Author(s). Open access. This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/ | en_GB |
dc.subject | Arctic Regions | en_GB |
dc.subject | Biodiversity | en_GB |
dc.subject | Chlorophyll | en_GB |
dc.subject | Ecological and Environmental Phenomena | en_GB |
dc.subject | Environment | en_GB |
dc.subject | Eukaryota | en_GB |
dc.subject | Phylogeny | en_GB |
dc.subject | Phylogeography | en_GB |
dc.subject | Phytoplankton | en_GB |
dc.subject | Rivers | en_GB |
dc.subject | Salinity | en_GB |
dc.subject | Seasons | en_GB |
dc.subject | Seawater | en_GB |
dc.title | Oceanographic structure drives the assembly processes of microbial eukaryotic communities | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2018-11-16T12:37:56Z | |
exeter.place-of-publication | England | en_GB |
dc.description | This is the final version. Available on open access from Springer Nature via the DOI in this record | en_GB |
dc.identifier.journal | ISME Journal | en_GB |