FN Archimer Export Format PT J TI Oceanographic structure and seasonal variation contribute to high heterogeneity in mesozooplankton over small spatial scales BT AF BRANDAO, Manoela Comtet, Thierry Pouline, Patrick Cailliau, Caroline BLANCHET-Aurigny, Aline Sourisseau, Marc Siano, Raffaele Memery, Laurent Viard, Frédérique Nunes, Flavia AS 1:1;2:2;3:3;4:3;5:1;6:4;7:4;8:5;9:6;10:1; FF 1:;2:;3:;4:;5:PDG-ODE-DYNECO-LEBCO;6:PDG-ODE-DYNECO-PELAGOS;7:PDG-ODE-DYNECO-PELAGOS;8:;9:;10:PDG-ODE-DYNECO-LEBCO; C1 Laboratory of Coastal Benthic Ecology, Ifremer Centre de Bretagne, DYNECO, Plouzané, France Sorbonne Université, Station Biologique de Roscoff, CNRS, UMR 7144 AD2M, Place G. Teissier, Roscoff, France Office Français de la Biodiversité, Parc Naturel Marin d'Iroise, Le Conquet, France Ifremer Centre de Bretagne, DYNECO, PELAGOS, Plouzané, France Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR CNRS/IFREMER/IRD/UBO 6539, Plouzané, France ISEM, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France C2 IFREMER, FRANCE UNIV SORBONNE, FRANCE OFB, FRANCE IFREMER, FRANCE CNRS, FRANCE UNIV MONTPELLIER, FRANCE SI BREST SE PDG-ODE-DYNECO-LEBCO PDG-ODE-DYNECO-PELAGOS UM LEMAR IN WOS Ifremer UPR WOS Cotutelle UMR copubli-france copubli-univ-france IF 3.906 TC 3 UR https://archimer.ifremer.fr/doc/00705/81674/88373.pdf LA English DT Article DE ;DNA metabarcoding;high-throughput sequencing;marine protected area;Mesozooplankton;mitochondrial COI;ocean front;18S rRNA AB The coastal oceans can be highly variable, especially near ocean fronts. The Ushant Front is the dominant oceanographic feature in the Iroise Sea (NE Atlantic) during summer, separating warm stratified offshore waters from cool vertically-mixed nearshore waters. Mesozooplankton community structure was investigated over an annual cycle to examine relationships with oceanographic conditions. DNA metabarcoding of COI and 18S genes was used in communities from six sites along two cross-shelf transects. Taxonomic assignments of 380 and 296 OTUs (COI and 18S, respectively) identified 21 classes across 13 phyla. Meroplankton relative abundances peaked in spring and summer, particularly for polychaete and decapod larvae, respectively, corresponding to the reproductive periods of these taxa. Meroplankton was most affected by season, while holoplankton varied most by shelf position. Copepods with a mixed feeding strategy were associated with the most offshore sites, especially in the presence of the front, while filter-feeding or carnivorous copepods were associated with nearshore sites. In sum, mesozooplankton communities in well-mixed coastal waters were distinct from those found in the Ushant Front (high thermal stratification and chlorophyll-a). Furthermore, the benthic compartment, through its partial life cycle in the water column, contributed to high heterogeneity in planktonic communities over short temporal and spatial scales. PY 2021 PD NOV SO Ices Journal Of Marine Science SN 1054-3139 PU Oxford University Press (OUP) VL 78 IS 9 UT 000743803900019 BP 3288 EP 3302 DI 10.1093/icesjms/fsab127 ID 81674 ER EF