FN Archimer Export Format
PT J
TI Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay
BT 
AF Toullec, Jordan
   Moriceau, Brivaela
   Vincent, Dorothée
   Guidi, Lionel
   Lafond, Augustin
   Babin, Marcel
AS 1:1;2:1;3:2;4:3;5:4;6:5,6;
FF 1:;2:;3:;4:;5:;6:;
C1 Univ Brest, CNRS, IRD, Ifremer, Laboratoire des sciences de l'environnement marin (LEMAR), Plouzané, France
   Office Français de la Biodiversité (OFB), Direction Surveillance, Evaluation Données (DSUED), Service Évaluation Connaissances et Usages du Milieu Marin (ECUMM), Brest, France
   Sorbonne Universités, UPMC Université Paris 06, CNRS, Laboratoire d’Océanographie de Villefranche (LOV) UMR7093, Observatoire Océanologique, Villefranche-sur-Mer, France
   Aix-Marseille University, Université de Toulon, CNRS, IRD, MIO, UM 110, Marseille, France
   Takuvik Joint International Laboratory, Laval University (Québec City, Quebec, Canada), Centre National de la Recherche Scientifique (CNRS), Paris, France
   Département de biologie et Québec-Océan, Université Laval, Québec City, Quebec, Canada
C2 UBO, FRANCE
   OFB, FRANCE
   UNIV SORBONNE, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   UNIV LAVAL, FRANCE
   UNIV LAVAL, CANADA
SI BREST
SE AUTRE
UM LEMAR
IN DOAJ
IF 4.569
TC 0
UR https://archimer.ifremer.fr/doc/00741/85347/90391.pdf
   https://archimer.ifremer.fr/doc/00741/85347/90392.docx
LA English
DT Article
DE ;Arctic phytoplankton spring bloom;Baffin Bay;Sea ice;Diatoms;Phaeocystis spp.;Copepods;Marine snow;Aggregates;UVP5
AB In the last decades, the Arctic Ocean has been affected by climate change, leading to alterations in the sea ice cover that influence the phytoplankton spring bloom, its associated food web, and therefore carbon sequestration. During the Green Edge 2016 expedition in the central Baffin Bay, the phytoplankton spring bloom and its development around the ice edge was followed along 7 transects from open water to the ice-pack interior. Here, we studied some of the processes driving phytoplankton aggregation, using aggregate and copepod distribution profiles obtained with an underwater vision profiler deployed at several stations along the transects. Our results revealed a sequential pattern during sea ice retreat in phytoplankton production and in aggregate production and distribution. First, under sea ice, phytoplankton started to grow, but aggregates were not formed. Second, after sea ice melting, phytoplankton (diatoms and Phaeocystis spp. as the dominant groups) benefited from the light availability and stratified environment to bloom, and aggregation began coincident with nutrient depletion at the surface. Third, maxima of phytoplankton aggregates deepened in the water column and phytoplankton cells at the surface began to degrade. At most stations, silicate limitation began first, triggering aggregation of the phytoplankton cells; nitrate limitation came later. Copepods followed aggregates at the end of the phytoplankton bloom, possibly because aggregates provided higher quality food than senescing phytoplankton cells at the surface. These observations suggest that aggregation is involved in 2 export pathways constituting the biological pump: the gravitational pathway through the sinking of aggregates and fecal pellets and the migration pathway when zooplankton follow aggregates during food foraging. 
PY 2021
PD OCT
SO Elementa: Science of the Anthropocene
SN 2325-1026
PU University of California Press
VL 9
IS 1
DI 10.1525/elementa.2021.00001
ID 85347
ER

EF