@inproceedings{fdi:010072108,
  title = {{A}coustic study of water masses over {S}enegalese continental shelf : effect of environmental variable on the structure of zooplankton layers [r{\'e}sum{\'e}]},
  author = {{D}iogoul, {N}. and {B}rehmer, {P}atrice and {P}errot, {Y}annick and {T}hiam, {A}. and {S}adio, {O}. and {S}arre, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he macrozooplankton organisms aggregate at specific depths and occur as scattering layer on echosounder records. {T}hey constitute an important component in the marine food web in direct contact with primary producers. {W}e review phytoplankton and zooplankton literature in {S}enegal, and then characterized the {S}enegalese water masses of the "{P}etite c{\^o}te" on physicochemical and biological criteria using an in situ data set collected during an acoustics survey ({ECOAO}) led onboard {FRV} {A}ntea in 2013. {T}hen we described at fine scale spatial and temporal variation of macrozooplankton layers in relation with their environment. {T}wo areas with different characteristics have been discriminated: the upwelling's cell area and the upwelling's offshore area more stratified, warm and sharply separated from the other area by a strong thermal boundary. {T}he spatio-temporal variation of scattering layer's thickness of macrozooplankton is strongly influenced by depth and time of the day. {T}he scattering layer's thickness increases with depth along a coast-high sea gradient, but no variation is reported along longitudinal plane i.e. {N}orth-{S}outh. {I}n both areas nocturnal layers are thicker and deeper than diurnal ones. {T}he hydrological structure of the water column also influence the macrozooplankton scattering layer. {T}he scattering layer requires "stable" physical conditions which support vertical stratification. {I}n the upwelling's area cell, the parameters correlated to scattering layer thickness during night time are chlorophyll 'a' and dissolved oxygen. {I}n the upwelling's offshore area, temperature, water density and chlorophyll 'a' concentration have a significant effect on the scattering layer's thickness during the daytime. {H}owever, during the nighttime, chlorophyll 'a' has no significant effect on the scattering layer's thickness. {T}his absence of correlation between chlorophyll 'a' and scattering layer thickness could be explained by an inverse diel vertical migration of a macrozooplankton group. {O}n this basis we assume that trophic relationship between phytoplankton and macrozooplankton operate during the day at the surface.},
  keywords = {{SENEGAL} ; {ATLANTIQUE}},
  numero = {},
  pages = {35--36},
  booktitle = {{I}nternational conference {ICAWA} 2016 : extended book of abstract : the {AWA} project : ecosystem approach to the management of fisheries and the marine environment in {W}est {A}frican waters},
  year = {2017},
  ISBN = {978-2-9553602-0-5},
  URL = {https://www.documentation.ird.fr/hor/fdi:010072108},
}