@article{fdi:010086372,
  title = {{M}ulti-species hotspots detection using self-organizing maps : simulation and application to purse seine tuna fisheries management},
  author = {{S}tephan, {P}. and {G}aertner, {D}aniel and {P}erez, {I}lan and {G}uery, {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}o fulfil fisheries management objectives that often include implementing the precautionary and ecosystem-based approaches, multispecies fisheries data need to be analysed. {A}mongst the different methods dealing with these multidimensional data, self-organizing maps ({SOM}s) remain rarely used, although they are highly flexible in data input and offer visualization possibilities particularly suited to summarize complex datasets. {H}ere, we propose to combine {SOM}s with a clustering approach to break down data complexity and produce simple geographic maps showing catch hotspots, which can indicate sensitive zones in terms of fishery management. {T}o promote this approach, we tested it first on simulated datasets and then on the open-access {ICCAT} commercial catch database of the tropical tuna fisheries of the {A}tlantic {O}cean. {W}e aimed to detect drifting fish aggregating devices (d{FAD}s) catch hotspots of juveniles of two tuna species, bigeye and yellowfin tunas and of the silky shark, a commonly bycaught vulnerable shark species, in tropical tuna purse seine fisheries. {S}imulations on datasets increasing in complexity (in number, geographic and duration extent of the hotspots and number of species in the analysis) informed us about the method's sensitivity and limits. {O}ur findings showed that, in the context of multi-specific fisheries, the detection of the hotspot is dependent on a certain level of catch within the hotspot and that adding species to the analysis tended to mask small and short-duration hotspots. {A}pplied to tropical tuna fisheries' data, the method confirmed the empirical knowledge on which first time-area closures were based and provided scientifical support. {A}ll in all, the visual support provided by the method, its interpretability and its potential transferability to other fisheries' systems constitute its main strengths and imply a possible implementation in management decisions; specifically, as a tool to reach agreement between stakeholders in the definition of regulated areas for protecting juveniles of tunas and vulnerable associated species to d{FAD} practices.},
  keywords = {bycatch ; ecosystem-based approach ; {FAD} ; multispecies fisheries management ; self-organizing maps ; time-area closures ; tropical tunas},
  booktitle = {},
  journal = {{M}ethods in {E}cology and {E}volution},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[15 ]},
  ISSN = {2041-210{X}},
  year = {2022},
  DOI = {10.1111/2041-210x.14008},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086372},
}