@article{fdi:010061902,
  title = {{I}nfluence of mesoscale features on micronekton and large pelagic fish communities in the {M}ozambique {C}hannel},
  author = {{P}otier, {M}ichel and {B}ach, {P}ascal and {M}{\'e}nard, {F}r{\'e}d{\'e}ric and {M}arsac, {F}rancis},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e investigated the diversity and distribution of two communities, micronekton organisms and large predatory fishes, sampled in mesoscale features of the {M}ozambique {C}hannel from 2003 to 2009, by combining mid-water trawls, stomach contents of fish predators and instrumented longline fishing surveys. {T}he highest species richness for assemblages was found in divergences and fronts rather than in the core of eddies. {D}espite an unbalanced scheme, diversity indices did not differ significantly between cyclonic and anticyclonic eddies, divergences and fronts. {W}e found that eddies and associated physical cues did not substantially affect the distribution of micronektonic species which are mainly driven by the diel vertical migration pattern. {T}op predators exhibited a more complex response. {S}wordfish ({X}iphias gladius) associated better with mesoscale features than tunas, with a clear preference for divergences which is consistent with the diel vertical migrations and occurrence of its main prey, the flying squids {S}thenoteuthis oualaniensis ({O}mmastrephidae). {O}n the other hand, the probability of presence of yellowfin tuna was not tied to any specific eddy structure. {H}owever, the highest values of positive yellowfin {CPUE}s were associated with low horizontal gradients of sea-level anomalies. {W}e also showed a non-linear response of positive yellowfin {CPUE}s with respect to the depth of the minimal oxygen content. {T}he larger the distance between the hooks and the minimal oxygen layer, towards the surface or at greater depths, the higher the {CPUE}, highlighting that yellowfin congregated in well-oxygenated waters. {M}icronekton sampled by mid-water trawls and stomach contents exhibited different species composition. {T}he highly mobile organisms were not caught by trawling whereas they remain accessible to predators. {T}he combination of stomach contents and mid-water trawls undoubtedly improved our understanding of the micronekton assemblage distribution. {O}ur results provide some evidence that mesoscale features in the {M}ozambique {C}hannel do not strongly affect the distribution of the mid-trophic level organisms such as micronekton and most of the large predatory fishes, and hypotheses are proposed to support this result.},
  keywords = {{B}iodiversity ; {O}ceanic eddies ; {M}id-water trawl ; {P}elagic longline ; {S}tomach contents ; {M}ozambique {C}hannel ; {MOZAMBIQUE} {CANAL} ; {OCEAN} {INDIEN}},
  booktitle = {{T}he {M}ozambique channel : mesoscale dynamics and ecosystem responses},
  journal = {{D}eep-{S}ea {R}esearch {P}art {II}.{T}opical {S}tudies in {O}ceanography},
  volume = {100},
  numero = {{N}o sp{\'e}cial},
  pages = {184--199},
  ISSN = {0967-0645},
  year = {2014},
  DOI = {10.1016/j.dsr2.2013.10.026},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061902},
}