FN Archimer Export Format
PT J
TI Seamount effect on circulation and distribution of ocean taxa in the vicinity of La Pérouse, a shallow seamount in the southwestern Indian Ocean
BT 
AF Marsac, Francis
   Annasawmy, Pavanee
   Noyon, Margaux
   Demarcq, Herve
   Soria, Marc
   Rabearisoa, Njaratiana
   Bach, Pascal
   Cherel, Yves
   Grelet, Jacques
   Romanov, Evgeny
AS 1:1,2;2:1,2;3:3;4:1,2;5:1,2;6:1,2;7:2,4;8:6;9:7;10:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Sète, France
   Institut de Recherche pour le Développement (IRD), Sète, France
   UK-SA NRF/DST Bilateral Research Chair: Ocean Sciences & Marine Food Security, Nelson Mandela University, Port Elizabeth, South Africa
   MARBEC, Univ Montpellier, CNRS, Ifremer, IRD, Victoria, Seychelles
   CAP RUN – CITEB, Le Port, Île de La Réunion, France
   Centre D’Etudes Biologiques de Chizé (CEBC), UMR 7372 CNRS-La Rochelle Université, Villiers-en-Bois, France
   IMAGO, IRD Bretagne, Technopole de Brest Iroise, Plouzané, France
C2 IRD, FRANCE
   IRD, FRANCE
   UNIV NELSON MANDELA, SOUTH AFRICA
   IRD, FRANCE
   CAP RUN, FRANCE
   UNIV LA ROCHELLE, FRANCE
   IRD, FRANCE
UM MARBEC
IN WOS Cotutelle UMR
   copubli-france
   copubli-univ-france
   copubli-int-hors-europe
   copubli-sud
IF 2.732
TC 2
UR https://archimer.ifremer.fr/doc/00631/74286/73901.pdf
LA English
DT Article
CR LA PEROUSE
   MD 192 / RHUM-RUM
   MICROTON
BO Antea
   Marion Dufresne
DE ;Bathymetry;Mesoscale eddies;L-ADCP;Mesozooplankton;Micronekton;Stomach contents;Pelagic longline fisheries
AB The La Pérouse seamount (60 m depth) has so far been poorly studied despite it being a short distance (160 km) from Réunion Island. As part of the MADRidge project, a multidisciplinary cruise was conducted to evaluate the effect of this shallow seamount on the local hydrology and ecology. Current measurements, temperature and chlorophyll-a profiles, and mesozooplankton and micronekton samples were collected between the summit and 35 km away. Micronekton data were supplemented with stomach content of pelagic top predators as well as fisheries statistics from the domestic longline fleet operating from Réunion. Vertical current profiles revealed distinct patterns between the offshore and seamount-flanked stations, giving evidence of topographical induced flow instabilities, notably on its leeward side (west) relative to the east flank. Distinct patterns in temperature and chlorophyll-a vertical profiles suggest the formation of convergent and divergent circulation cells as a result of the irregular and crescent-like summit topography. Spatial differences in zooplankton abundance were detected with higher biovolumes on the leeward flank. The overall acoustic backscatter for micronekton over the summit was weaker than offshore, but highly concentrated in the upper layer. Albacore tuna and swordfish dominate the longline catch west of Réunion, seemingly in association with a deep (900 m) topographic feature. Yet the largest catch is not directly associated with La Pérouse which would be too shallow for top predators to aggregate around in the long term. Enhanced levels of phytoplankton or zooplankton enrichment at La Pérouse were not demonstrated in this study, nor was there notable diversity of micronekton species. This might explain the relatively limited importance of this seamount to the tuna fisheries in this region. 
PY 2020
PD JUL
SO Deep-sea Research Part Ii-topical Studies In Oceanography
SN 0967-0645
PU Elsevier BV
VL 176
UT 000556810400009
DI 10.1016/j.dsr2.2020.104806
ID 74286
ER

EF