FN Archimer Export Format
PT J
TI Comparison of mesozooplankton communities at three shallow seamounts in the South West Indian Ocean
BT 
AF Noyon, Margaux
   Rasoloarijao, Zo
   Huggett, Jenny
   Ternon, Jean-Francois
   Roberts, Michael
AS 1:1;2:1;3:3,4;4:5;5:1,2;
FF 1:;2:;3:;4:;5:;
C1 UK-SA NRF/DST Bilateral Research Chair: Ocean Sciences & Marine Food Security, Nelson Mandela University, Port Elizabeth, South Africa
   National Oceanography Centre, Southampton, United Kingdom
   Oceans and Coastal Research, Department of Environmental Affairs, Private Bag X4390, Cape Town, 8000, South Africa
   Marine Research Institute, Department of Biological Sciences, University of Cape Town, Private Bag X3, Rondebosch, 7701, Cape Town, South Africa
   MARBEC, Univ. Montpellier, CNRS, Ifremer, IRD, Sète, France
C2 UNIV NELSON MANDELA, SOUTH AFRICA
   NOC, UK
   OCEANS AND COASTAL RESEARCH, SOUTH AFRICA
   UNIV CAPE TOWN, SOUTH AFRICA
   IRD, FRANCE
UM MARBEC
IN WOS Cotutelle UMR
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 2.732
TC 6
UR https://archimer.ifremer.fr/doc/00609/72157/70920.pdf
LA English
DT Article
CR LA PEROUSE
   MAD-RIDGE-1
   MD 208 / WALTERS SHOAL
BO Antea
   Marion Dufresne
DE ;Normalised biovolume size spectrum (NBSS);Mesoscale eddies;Topography;Oligotrophic environment;Pelagic ecology
AB Seamounts are recognised as hotspots of biodiversity, attracting large numbers of top predators, but the underlying mechanisms are still unclear. We studied mesozooplankton abundance and size distribution at three shallow seamounts (60m, 240m and 18m deep) in the South West Indian Ocean, along a latitudinal gradient (19°S, 27°S and 33°S). Samples were analysed using a ZooScan, allowing the use of a size-based approach. Differences were observed between seamount areas, but overall zooplankton communities did not seem to be affected by the changes in topography. Only in the lee of La Pérouse seamount was the zooplankton community slightly more concentrated than upstream, suggesting that zooplankton were flushed downstream of the seamount. The southernmost and shallowest seamount, Walters Shoal, had low abundance and its size spectrum differed greatly from the two other seamounts further north. These differences were attributed to seasonality and mesozooplankton population dynamics, whereas the other two seamounts exhibited a more “typical” oligotrophic pelagic ecosystem, at equilibrium and dominated by small organisms. At the time of sampling, the unnamed seamount south of Madagascar was influenced by a mesoscale dipole that impacted the zooplankton distribution, potentially masking any seamount effect. The normalised biomass spectrum approach contributed to a better understanding of the ecosystem dynamics (i.e. equilibrium vs. non-steady state) but revealed little variability within a stable oligotrophic environment. 
PY 2020
PD JUL
SO Deep-sea Research Part Ii-topical Studies In Oceanography
SN 0967-0645
PU Elsevier BV
VL 176
UT 000556810400008
DI 10.1016/j.dsr2.2020.104759
ID 72157
ER

EF