@inproceedings{fdi:010088457,
  title = {{A} finer look into the twilight zone : comparing acoustic records from an animal-borne miniature sonar and a multifrequency echosounder [r{\'e}sum{\'e}]},
  author = {{F}onvieille, {N}. and {I}zard, {L}. and {G}oulet, {P}. and {G}uinet, {C}. and {N}erini, {D}. and {L}ebourges {D}haussy, {A}nne and {R}oudaut, {G}ildas and {H}abasque, {J}{\'e}r{\'e}mie and {C}hevassu, {J}. and {C}astrec, {C}. and {T}ournier, {M}. and {P}icard, {B}. and {J}ohnson, {M}. and {C}ott{\'e}, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}n animal-borne miniature active echo-sounder has been recently deployed on southern ele-phant seals ({M}irounga leonina) from the {K}erguelen and {A}rgentinian colonies. {T}his high frequency sonar (1.5 {MH}z) has shown a strong potential in detecting small mid-trophic level targets (zoo-plankton and micronekton). {R}elative abundance and distribution can be assessed, allowing to observe temporal (diel migration) and spatial patterns of plankton. {H}owever, the interpretation of the collected data remains uncertain. {T}o address this lack of information, we conducted in situ experiments onboard the {M}arion {D}ufresne vessel in the {S}outhern {O}cean (10th {F}ebruary to 6th {M}arch 2022). {T}he microsonar was fixed on the rosette sampler at 13 locations and attached 16 times to a trawling net (4 mm mesh). {R}ecords will be analyzed applying a recent method devel-oped on elephant seals data to detect targets in the beam and estimate organisms abundance. {T}he result will be compared with biological samples and backscattering layers detected by a multifrequency {EK}80 echosounder (18, 38, 70, 120 and 200 k{H}z), offering an acoustic landscape of the seals foraging area. {T}his study will benefit to ongoing research regarding biological fields visited by the elephant seals, bringing precision on microsonar target detection capacities.},
  keywords = {{ARGENTINE} ; {ATLANTIQUE} ; {OCEAN} {INDIEN} ; {KERGUELEN} {ILES}},
  volume = {4},
  numero = {54},
  pages = {37--38},
  booktitle = {{W}orking group of fisheries acoustics, science and technology ({WGFAST})},
  year = {2022},
  ISSN = {2618-1371},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088457},
}