FN Archimer Export Format
PT J
TI Fine-scale vertical structure of sound-scattering layers over an east border upwelling system and its relationship to pelagic habitat characteristics
BT 
AF DIOGOUL, Ndague
   BREHMER, Patrice
   PERROT, Yannick
   TIEDEMANN, Maik
   EL AYOUBI, Salaheddine
   MOUGET, Anne
   MIGAYROU, Chloe
   SADIO, Oumar
   SARRE, Abdoulaye
AS 1:1,2,6;2:2,3,6;3:3;4:4;5:1;6:5;7:3;8:3;9:2;10:6;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 UCAD, Inst Environm Sci ISE, BP 5005, Dakar, Senegal.
   Univ Brest, CNRS, IFREMER, IRD,LEMAR, Campus UCAD IRD Hann, Dakar, Senegal.
   Univ Brest, CNRS, IFREMER, IRD,LEMAR,DR Ouest, Plouzane, France.
   IMR, Pelag Fish, POB 1870 Nordnes, N-5817 Bergen, Norway.
   INRH, Agadir, Morocco.
   ISRA, CRODT, BP 2221, Dakar, Senegal.
C2 UNIV CHEIKH ANTA DIOP (UCAD), SENEGAL
   IRD, SENEGAL
   IRD, FRANCE
   IMR (BERGEN), NORWAY
   INRH, MOROCCO
   CRODT, SENEGAL
UM LEMAR
IN WOS Cotutelle UMR
   DOAJ
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 3.416
TC 5
UR https://archimer.ifremer.fr/doc/00606/71777/70261.pdf
   https://archimer.ifremer.fr/doc/00606/71777/70262.zip
   https://archimer.ifremer.fr/doc/00606/71777/70263.pdf
   https://archimer.ifremer.fr/doc/00606/71777/70264.zip
LA English
DT Article
CR ECOAO
BO Antea
AB Understanding the relationship between sound-scattering layers (SSLs) and pelagic habitat characteristics is a substantial step to apprehend ecosystem dynamics SSLs are detected on echo sounders representing aggregated marine pelagic organisms. In this study, SSL characteristics of zooplankton and micronekton were identified during an upwelling event in two contrasting areas of the Senegalese continental shelf. Here a cold upwelling-influenced inshore area was sharply separated by a strong thermal boundary from a deeper, warmer, stratified offshore area. Mean SSL thickness and SSL vertical depth increased with the shelf depth. The thickest and deepest SSLs were observed in the offshore part of the shelf. Hence, zooplankton and micronekton seem to occur more frequently in stratified water conditions rather than in fresh upwelled water. Diel vertical and horizontal migrations of SSLs were observed in the study area. Diel period and physicochemical water characteristics influenced SSL depth and SSL thickness. Although chlorophyll-a concentration insignificantly affected SSL characteristics, the peak of chlorophyll a was always located above or in the middle of the SSLs, regularly matching with the peak of SSL biomass. Such observations indicate trophic relationships, suggesting SSLs to be mainly composed of phytoplanktivorous zooplankton and micronekton. Despite local hypoxia, below 30 m depth, distribution patterns of SSLs indicate no vertical migration boundary. The results increase the understanding of the spatial organization of mid-trophic species and migration patterns of zooplankton and micronekton, and they will also improve dispersal models for organisms in upwelling regions. 
PY 2020
PD JAN
SO Ocean Science
SN 1812-0784
PU Copernicus Gesellschaft Mbh
VL 16
IS 1
UT 000508125500001
BP 65
EP 81
DI 10.5194/os-16-65-2020
ID 71777
ER

EF