Need for focus on microbial species following ice melt and changing freshwater regimes in a Janus Arctic Gateway.

Autor: Joli N; Département de biologie, Québec Océan and Takuvik Joint International Laboratory (UMI 3376), Université Laval (Canada) - CNRS (France), Université Laval, Québec, QC, G1V 0A6, Canada. joli@biologie.ens.fr.; Institut de biologie intégrative et des systèmes (IBIS), Université Laval, Québec, QC, GIV 0A6, Canada. joli@biologie.ens.fr., Gosselin M; Institut des sciences de la mer de Rimouski, Université du Québec à Rimouski, 310 Allée des Ursulines, Rimouski, QC, G5L 3A1, Canada., Ardyna M; Sorbonne Universités, UPMC Paris 06, INSU-CNRS, Laboratoire d'Océanographie de Villefranche, 181 Chemin du Lazaret, 06230, Villefranche-sur-mer, France.; Department of Earth System Science, Stanford University, Stanford, CA, 94305, USA., Babin M; Département de biologie, Québec Océan and Takuvik Joint International Laboratory (UMI 3376), Université Laval (Canada) - CNRS (France), Université Laval, Québec, QC, G1V 0A6, Canada., Onda DF; Département de biologie, Québec Océan and Takuvik Joint International Laboratory (UMI 3376), Université Laval (Canada) - CNRS (France), Université Laval, Québec, QC, G1V 0A6, Canada.; Institut de biologie intégrative et des systèmes (IBIS), Université Laval, Québec, QC, GIV 0A6, Canada., Tremblay JÉ; Département de biologie, Québec Océan and Takuvik Joint International Laboratory (UMI 3376), Université Laval (Canada) - CNRS (France), Université Laval, Québec, QC, G1V 0A6, Canada., Lovejoy C; Département de biologie, Québec Océan and Takuvik Joint International Laboratory (UMI 3376), Université Laval (Canada) - CNRS (France), Université Laval, Québec, QC, G1V 0A6, Canada.; Institut de biologie intégrative et des systèmes (IBIS), Université Laval, Québec, QC, GIV 0A6, Canada.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2018 Jun 20; Vol. 8 (1), pp. 9405. Date of Electronic Publication: 2018 Jun 20.
DOI: 10.1038/s41598-018-27705-6
Abstrakt: Oceanic gateways are sensitive to climate driven processes. By connecting oceans, they have a global influence on marine biological production and biogeochemical cycles. The furthest north of these gateways is Nares Strait at the top of the North Water between Greenland and Ellesmere Island (Canada). This gateway is globally beneficial, first by supporting high local mammal and bird populations and second with the outflow of phosphate-rich Arctic waters fueling the North Atlantic spring bloom. Both sides of the North Water are hydrologically distinct with counter currents that make this Arctic portal a Janus gateway, after Janus, the Roman god of duality. We examined oceanographic properties and differences in phytoplankton and other protist communities from the eastern and western sides of the North Water (latitude 76.5°N) and found that species differed markedly due to salinity stratification regimes and local hydrography. Typical Arctic communities were associated with south flowing currents along the Canadian side, while potentially noxious Pseudo-nitzschia spp. were dominant on the Greenland side and associated with greater surface freshening from ice melt. This susceptibility of the Greenland side to Pseudo-nitzschia spp. blooms suggest that monitoring species responses to climate mediated changes is needed.
Databáze: MEDLINE
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