FN Archimer Export Format
PT J
TI Plankton spatial variability within the Marquesas archipelago, South Pacific
BT 
AF Martinez, Elodie
   Rodier, Martine
   Pagano, M.
   Sauzede, R.
AS 1:1,2;2:2,3;3:3;4:2,4;
FF 1:;2:;3:;4:;
C1 Institut de Recherche pour le Développement (IRD), University of Bretagne Occidentale (UBO), Centre National de la Recherche Scientifique (CNRS), Ifremer, Laboratoire d'Océanographie Physique et Spatiale (LOPS), IUEM, Brest 29280, France
   IRD, University of French Polynesia (UPF), Institut Louis Malardé (ILM), Ifremer, Écosystèmes Insulaires Océaniens (EIO), Tahiti, French Polynesia
   Aix Marseille Université, Université de Toulon, CNRS, IRD, Mediterranean Institute of Oceanography (MIO), 13288 Marseille, France
   Sorbonne Université, CNRS-INSU, Institut de la Mer de Villefranche, 06230 Villefranche-Sur-Mer, France
C2 IRD, FRANCE
   IRD, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   UNIV SORBONNE, FRANCE
UM LOPS
   EIO
IN WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
IF 2.542
TC 1
UR https://archimer.ifremer.fr/doc/00648/75993/76896.pdf
LA English
DT Article
CR BIOSOPE
BO L'Atalante
DE ;Island mass effect;Marquesas Islands;South Pacific;Oceanographic cruise;Plankton distribution
AB The Marquesas Islands, in the central South Pacific, are a place of an outstanding phytoplankton enrichment visible from space and is a hotspot of endemism and biodiversity; however, it has been poorly studied. In situ physical-chemical-biological concomitant observations are almost non-existent and all located close to the main northern island, while ocean dynamics based on satellite observations and numerical modeling show contrasting north/south patterns within the archipelago. Thus, we took the opportunity of the Pakahi I te Moana cruise conducted in 2012 to collect hydrological and plankton samples and investigate biogeochemical spatial patterns, especially north/south, over the archipelago. These data provide the first description of the spatial and vertical distribution of physical, chemical and plankton characteristics over the entire Marquesas archipelago, and gave a first hint to improve our understanding of this planktonic enrichment. The whole archipelago appeared to be a macronutrient-rich environment. Different patterns in the physical, chemical and biological vertical distributions were observed between the northern vs. southern part of the archipelago, and offshore vs. nearshore stations. Phytoplankton biomasses were higher in the north where stratification was weaker, compared to the south and higher close to the islands than offshore. Phytoplankton all over the archipelago was largely dominated by picophytoplankton; specifically, Prochlorococcus presented a more widespread distribution than previously thought and were present over a large range of nutrient concentrations. Copepods were always the most abundant taxa in the archipelago but showed higher mean relative abundances near the islands. The importance of suspension-feeding zooplankton in the northern islands coincided with the highest biomasses of phytoplankton with a predominance of nano- and micro-phytoplankton. This was consistent with a young community responding to nutrient enrichment by an increase of suspension-feeders animals and bottom-up effect on zooplankton. Opposite to this, small copepods were significantly less abundant in the northern offshore region and the dominance of carnivorous forms coincided with low phytoplankton biomass and strong dominance of picoplankton, suggesting a microbial grazing pathway and more mature communities. 
PY 2020
PD DEC
SO Journal Of Marine Systems
SN 0924-7963
PU Elsevier BV
VL 212
UT 000582806700011
DI 10.1016/j.jmarsys.2020.103432
ID 75993
ER

EF