@article{PAR00002696,
  title = {{F}ine-scale spatial variability of different stages of pelagic fish eggs over the western {A}gulhas {B}ank, {S}outh {A}frica},
  author = {{D}opolo, {M}. {T}. and {D}rapeau, {L}aurent and van der {L}ingen, {C}. {D}. and {M}oloney, {C}. {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}tage-dependent spatial distributions of anchovy {E}ngraulis encrasicolus, sardine {S}ardinops sagax and round herring {E}trumeus whiteheadi eggs over the western {A}gulhas {B}ank {S}outh {A}frica were examined from samples collected at a fine-scale (1.8 km) resolution using a continuous underway fish egg sampler ({CUFES}). {S}patial structure in egg distributions was assessed using variograms for three developmental stage groups (early-, middle- and late-stage eggs), and indices of aggregation were also computed for those stage groups. {N}o early- or middle-stage anchovy eggs were collected, but indices of aggregation showed that early-stage sardine eggs were more aggregated than those of round herring, suggesting that adult sardine have a more contiguous distribution during spawning than have round herring. {M}iddle-stage eggs were equally aggregated, whereas late-stage eggs were aggregated differently in all three species. {F}itted empirical variograms showed that early-stage sardine eggs have low small-scale variability (nugget effect) (<= 10% of total variance) compared with round herring eggs (>= 50% of total variance). {T}he autocorrelation range of both those species extends to 3.7 km. {M}iddle-stage sardine eggs have a low nugget effect (<= 10%) compared with round herring eggs (<= 50%), with autocorrelation ranges of 7.4 km and 5.6 km respectively. {L}ate-stage anchovy eggs have a lower nugget effect (<= 20%) than that of sardine (<= 50%) and round herring (>= 100%) eggs, with autocorrelation ranges of 3.7 km for all three species. {T}he spatial structures of the eggs of the three species were heterogeneous at the sampling scale used, indicating differences in spatial organisation of the adults during spawning. {T}he spatial variability of the eggs of the three species is not well captured using the sampling strategy during current ichthyoplankton surveys in the southern {B}enguela, in which stations are spaced 18.5 km apart.},
  keywords = {{A}ggregation ; {C}ufes ; {D}evelopment ; {E}gg distribution ; {F}ine-scale ; {P}elagic fish ; {S}ampling ; {V}ariogram ; {AFRIQUE} {DU} {SUD}},
  booktitle = {},
  journal = {{A}frican {J}ournal of {M}arine {S}cience},
  volume = {30},
  numero = {1},
  pages = {133--142},
  ISSN = {1814-232{X}},
  year = {2008},
  DOI = {10.2989/{AJMS}.2008.30.1.13.463},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00002696},
}