@article{fdi:010079900,
  title = {{B}ody size and stable isotope composition of zooplankton in the western tropical {A}tlantic},
  author = {de {F}igueiredo, {G}. {G}. {A}. {A}. and {S}chwamborn, {R}. and {B}ertrand, {A}rnaud and {M}unaron, {J}ean-{M}arie and {L}e {L}oc'h, {F}ran{\c{c}}ois},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ize-based approaches are paramount tools for the study of marine food webs. {H}ere, we investigated the relationship between zooplankton body size, stable isotope composition and trophic level ({TL}) along a large-scale onshore-offshore gradient in the western tropical {A}tlantic. {S}amples were obtained on the {B}razilian continental shelf, slope and in oceanic waters (off {F}ernando de {N}oronha archipelago and {R}ocas {A}toll) in {S}eptember and {O}ctober 2015. {Z}ooplankton was sieved into five size fractions. {Z}ooplankton was dominated by copepods, except for the largest (> 2000 mu m) size fraction, that showed a high biovolume of chaetognaths, decapods, and fish larvae. {M}aximum zooplankton abundance and biovolume was found at the continental slope. {POM} showed consistently lower delta {C}-13 than zooplankton, indicating a selective use of {C}-13-rich primary food sources by zooplankton. {P}articulate organic matter ({POM}) was more {C}-13-enriched in shelf areas (average: -22.8, -23.6 and -24.3% at the shelf, slope and oceanic islands, respectively), probably due to the higher abundance of diatoms nearshore. {POM} had delta {N}-15 values between 2.5 and 6.9% (average: 4.0, 4.9 and 4.2% at the shelf, slope and oceanic islands, respectively). {Z}ooplankton delta {N}-15 and {TL} increased with body size. {T}he delta {N}-15 of the 200-500 mu m size fraction was used as baseline for {TL} estimation. {O}ceanic areas (average baseline delta {N}-15 = 5.8% +/- 0.52, n = 14) showed a higher baseline delta {N}-15 than the shelf (average = 3.9% +/- 0.69, n = 9) and the slope areas (average = 3.1% +/- 0.93, n = 9). {I}n spite of differing baselines, the delta {N}-15 data produced a consistent pattern of log-linear increase in {TL} with increasing size, in all areas. {T}he choice of input trophic enrichment factor ({TEF}) values only slightly changed the log10 (body size) vs {TL} slopes, but this choice had a considerable effect on the estimates of predator/prey size ratio ({PPSR}) and predator/prey mass ratio ({PPMR}). {U}sing a {TEF} above 2.3 leads to unrealistic {PPSR} and {PPMR} estimates. {O}verall average slope was 0.59 +/- 0.08 {TL} mu m(-1) with {TEF} = 2.3 and 0.42 +/- 0.07 {TL} mu m(-1) with {TEF} = 3.2.},
  keywords = {{P}lankton ; delta {C}-13 ; delta {N}-15 ; {S}ize classes ; {T}rophic level ; {P}redator/prey mass ratio ; {ATLANTIQUE} ; {BRESIL} ; {FERNANDO} {DE} {NORONHA} ; {ROCAS} {ATOLL} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {M}arine {S}ystems},
  volume = {212},
  numero = {},
  pages = {103449 [10 p.]},
  ISSN = {0924-7963},
  year = {2020},
  DOI = {10.1016/j.jmarsys.2020.103449},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079900},
}