@article{fdi:010042506,
  title = {{A} cyanobacterial bloom prevents fish trophic cascades},
  author = {{R}ondel, {C}aroline and {A}rfi, {R}obert and {C}orbin, {D}aniel and {L}e {B}ihan, {F}. and {N}dour, {E}l {H}adji and {L}azzaro, {X}avier},
  editor = {},
  language = {{ENG}},
  abstract = {1. {W}e experimentally compared the impacts of visually feeding zooplanktivorous fish and filter-feeding omnivorous fish in shallow tropical {D}akar {B}ango reservoir, {S}enegal. {W}e provoked a cyanobacterial {A}nabaena bloom under mesotrophic to eutrophic {N}-limited conditions in 18 enclosures assigned to six {N}ile tilapia life-stage treatments, at typical biomasses: fishless control ({C}), zooplanktivorous fry ({Z}), omnivorous juveniles ({O}), herbivorous fingerlings ({H}) and two combinations ({OZ}, {OH}). 2. {A}ll fish grew well, but as prevalent inedible phytoplankton dampened fish effects, community-level trophic cascades did not occur. {P}lanktivore types acted independently and affected differentially the biomasses of total zooplankton, cyclopoids, nauplii, cladocerans, invertebrate carnivores, large herbivores, colonial cyanobacteria and {C}hlorophyta. {T}hey neither influenced the total biomass of phytoplankton, nor most water chemistry characteristics. {R}esponses were apparently not fish-biomass related. {T}he bloom collapsed synchronously in all enclosures, coinciding with enrichment ending, with a return to clear water within 12 days. 3. {O}ur results support the hypothesis that excess nutrients and prevalent inedible cyanobacteria inhibit the cascading effects of natural biomass levels of both visually feeding zooplanktivores and filter-feeding omnivores. {I}n {N}-limited meso-eutrophic shallow tropical lakes with predominantly small herbivorous zooplankton, neither the type nor the biomass of planktivorous fish present seems likely to prevent the transient outburst of cyanobacterial blooms. {S}uch fragile ecosystems may thus not sustain a trophic state suitable for drinking water production, unless human impacts are restricted. {T}he generality of restoration approaches based on ecological engineering should be further explored.},
  keywords = {cyanobacterial bloom ; food webs ; {N}ile tilapia ; omnivory ; trophic cascade},
  booktitle = {},
  journal = {{F}reshwater {B}iology},
  volume = {53},
  numero = {4},
  pages = {637--651},
  ISSN = {0046-5070},
  year = {2008},
  DOI = {10.1111/j.1365-2427.2007.01894.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010042506},
}