@article{fdi:010071784,
  title = {{S}kipjack tuna availability for purse seine fisheries is driven by suitable feeding habitat dynamics in the {A}tlantic and {I}ndian oceans},
  author = {{D}ruon, {J}.{N}. and {C}hassot, {E}mmanuel and {M}urua, {H}. and {L}opez, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A}n {E}cological {N}iche model was developed for skipjack tuna ({K}atsuwonus pelamis, {SKJ}) in the {E}astern {C}entral {A}tlantic {O}cean ({AO}) and {W}estern {I}ndian {O}cean ({IO}) using an extensive set of presence data collected by the {E}uropean purse seine fleet (1998–2014). {C}hlorophyll-a fronts were used as proxy for food availability while mixed layer depth, sea surface temperature, dissolved oxygen, salinity, current intensity, and height anomaly variables were selected to describe {SKJ}'s abiotic environmental preferences. {T}he resultant ecological niche included both mesoscale eddy-type productive features that displayed latitudinal range in the {IO} to large scale upwelling systems that shrink and swell seasonally in the {AO}. {O}verall, 83% of all free swimming school sets ({FSC}) and 75% of drifting fish aggregating device sets (d{FAD}) that contained {SKJ} occurred within 25 km of favorable feeding habitat. {I}n the {AO}, 34% of d{FAD} sets were made more than 100 km away from this habitat, mostly in the surface chlorophyll-a poor environment of the {G}uinea {C}urrent. {T}hese distant sets represent 10% of d{FAD} sets in the {IO} and 8% of all {FSC} sets. {O}ur results suggest that the {M}ozambique {C}hannel in the {IO}, with its simultaneously favorable feeding and spawning conditions, may seasonally offer a better {SKJ} nursery habitat than the {G}uinea {C}urrent which shows a substantially poorer feeding capacity. {W}ith the exception of this latter area, our results also suggest that fishing accessibility will be higher in months where the size of the favorable feeding habitats are reduced, likely because this reduction drives a geographical contraction in {SKJ} populations. {T}he observed relationship between the annual size of favorable feeding habitat and both annual catch rates and total catches in the {IO} is consistent with the near-full exploitation of this stock that has occurred since the 2000s. {M}oreover, it suggests that annual habitat size could be used as an indicator of growth capacity for this highly productive stock. {H}abitat monitoring, as part of a dynamic fisheries management approach, should contribute to the sustainable exploitation of {SKJ} by providing information on the climate-dependent aspects of stock variability and the effects of d{FAD} deployment in food-rich habitats.},
  keywords = {{ATLANTIQUE} ; {OCEAN} {INDIEN}},
  booktitle = {},
  journal = {{F}rontiers in {M}arine {S}cience},
  volume = {4},
  numero = {},
  pages = {art. no 315 [17  en ligne]},
  year = {2017},
  DOI = {10.3389/fmars.2017.00315},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071784},
}