@incollection{fdi:010088552,
  title = {{D}escriptors to characterize acoustic scattered layers : evidence of interest in three {A}tlantic {A}frican large marine ecosystems},
  author = {{M}ouget, {A}. and {B}rehmer, {P}atrice and {P}errot, {Y}annick and {U}anivi, {U}. and {D}iogoul, {D}. and {E}l {A}youbi, {S}. and {J}eyid, {M}.{A}. and {S}arr{\'e}, {A}. and {B}ehagle, {N}. and {K}ouassi, {A}.{M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{H}ydroacoustic is now a reliable and often used tool to monitor and study marine ecosystems ({B}rehmer et al. 2006). {T}his study focus on acoustic scattered layers, which are the echosounder detection of pelagic marine organism of low trophic level, important in ecosystems functioning. {D}ata have been recorded at 38 k{H}z in the three {A}tlantic {A}frican {L}arge {M}arine {E}cosystems ({LME}). {L}ayers have been extracted using {M}atecho ({P}errot et al. 2018) at a threshold level of -70 d{B}. {T}o describe parsimoniously ecosystems, compare them and understand the difference, two descriptors have been used. {S}ome of them are based on already used descriptors and others are new. {T}he aim of this study is to ensure that these descriptors are relevant to monitor and compare systems. {T}herefore, we first explore temporal and spatial dimension. {F}or such purpose, we use a large acoustic database collected in {C}anary {C}urrent {L}arge {M}arine {E}cosystem '{CCLME}' ({D}iogoul et al., 2020; {B}rehmer et al. 2018). {T}he temporal dimension is studied by diel comparison and by analysing change over years in each system. {S}patial dimension is explored by intra-{LME} comparison concerning {CCLME}, which present two systems with different functioning. {R}esults highlight the effectiveness of these descriptors. {T}he methodology presented in this work is innovative, introducing original new descriptors to monitor pelagic compartment of each {LME} and should be efficiently used for environmental monitoring in case of perturbation as overfishing, climate change or marine pollution. {I}ndeed the acoustic scattered layer are mainly composed of macrozooplankton and ichtyoplankton, which are sensitive to environmental change.},
  keywords = {{AFRIQUE} {DE} {L}'{OUEST} ; {ATLANTIQUE} ; {CANARIES} {COURANT}},
  booktitle = {{O}ceans 2021 - {S}an {D}iego - {P}orto},
  numero = {},
  pages = {en ligne [6 ]},
  address = {{P}iscataway},
  publisher = {{IEEE}},
  series = {},
  year = {2021},
  DOI = {10.23919/{OCEANS}44145.2021.9705993},
  ISBN = {978-1-6654-2788-3},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088552},
}