Oceanographic structure and seasonal variation contribute to high heterogeneity in mesozooplankton over small spatial scales

Type Article
Date 2021-11
Language English
Author(s) Brandao ManoelaORCID1, Comtet ThierryORCID2, Pouline Patrick3, Cailliau Caroline3, Blanchet-Aurigny Aline1, Sourisseau MarcORCID4, Siano RaffaeleORCID4, Memery Laurent5, Viard FrédériqueORCID6, Nunes FlaviaORCID1
Affiliation(s) 1 : Laboratory of Coastal Benthic Ecology, Ifremer Centre de Bretagne, DYNECO, Plouzané, France
2 : Sorbonne Université, Station Biologique de Roscoff, CNRS, UMR 7144 AD2M, Place G. Teissier, Roscoff, France
3 : Office Français de la Biodiversité, Parc Naturel Marin d'Iroise, Le Conquet, France
4 : Ifremer Centre de Bretagne, DYNECO, PELAGOS, Plouzané, France
5 : Laboratoire des Sciences de l'Environnement Marin (LEMAR), UMR CNRS/IFREMER/IRD/UBO 6539, Plouzané, France
6 : ISEM, Univ Montpellier, CNRS, EPHE, IRD, Montpellier, France
Source Ices Journal Of Marine Science (1054-3139) (Oxford University Press (OUP)), 2021-11 , Vol. 78 , N. 9 , P. 3288-3302
DOI 10.1093/icesjms/fsab127
WOS© Times Cited 2
Keyword(s) DNA metabarcoding, high-throughput sequencing, marine protected area, Mesozooplankton, mitochondrial COI, ocean front, 18S rRNA

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.

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Brandao Manoela, Comtet Thierry, Pouline Patrick, Cailliau Caroline, Blanchet-Aurigny Aline, Sourisseau Marc, Siano Raffaele, Memery Laurent, Viard Frédérique, Nunes Flavia (2021). Oceanographic structure and seasonal variation contribute to high heterogeneity in mesozooplankton over small spatial scales. Ices Journal Of Marine Science, 78(9), 3288-3302. Publisher's official version : https://doi.org/10.1093/icesjms/fsab127 , Open Access version : https://archimer.ifremer.fr/doc/00705/81674/