@article{PAR00013728,
  title = {{M}icrobial food web structural and functional responses to oyster and fish as top predators},
  author = {{M}ostajir, {B}. and {R}oques, {C}. and {B}ouvier, {C}. and {B}ouvier, {T}. and {F}ouilland, {E}. and {G}ot, {P}. and {L}e {F}loc'h, {E}. and {N}ouguier, {J}. and {M}as, {S}. and {S}emp{\'e}r{\'e}, {R}ichard and {S}ime-{N}gando, {T}. and {T}roussellier, {M}arc and {V}idussi, {F}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he impact of fish and oysters on components of the pelagic microbial food web ({MFW}) was studied in a 10 d mesocosm experiment using {M}editerranean coastal waters. {T}wo mesocosms contained natural water only ('{C}ontrols'), 2 contained natural water with {C}rassostrea gigas ('{O}yster'), and 2 contained natural water with {A}therina spp. ('{F}ish'). {A}bundances and biomasses of microorganisms (viruses, bacteria, phytoplankton, heterotrophic flagellates, and ciliates) were measured to estimate their contribution to the total microbial carbon biomass. {T}wo {MFW} indices, the microbial autotroph: heterotroph {C} biomass ratio ({A}:{H}) structural index and the gross primary production: respiration ratio ({GPP}:{R}) functional index, were defined. {I}n the {F}ish mesocosms, selective predation on zooplankton led to a trophic cascade with 51% higher phytoplankton {C} biomass and consequently higher {A}: {H} and {GPP}: {R} than in the {C}ontrols. {B}y the end of the experiment, the {O}yster mesocosms had a bacterial {C} biomass 87% higher and phytoplankton {C} biomass 93% lower than the {C}ontrols, giving significantly lower {A}: {H} and {GPP}: {R} (<1). {O}verall, the results showed that wild zooplanktivorous fish had a cascading trophic effect, making the {MFW} more autotrophic (both indices >1), whereas oyster activities made the {MFW} more heterotrophic (both indices <1). {T}hese {MFW} indices can therefore be used to assess the impact of multiple local and global forcing factors on the {MFW}. {T}he results presented here also have implications for sustainable management of coastal environments, suggesting that intense cultivation of filter feeders can be coupled with management to encourage wild local zooplanktivorous fishes to maintain a more resilient system and preserve the equilibrium of the {MFW}.},
  keywords = {{M}icrobial food web ; {V}irioplankton ; {B}acterioplankton ; {P}hytoplankton ; {P}rotozooplankton ; {C}rassostrea ; {A}therina ; {A}utotrophy ; {H}eterotrophy ; {MEDITERRANEE}},
  booktitle = {},
  journal = {{M}arine {E}cology {P}rogress {S}eries},
  volume = {535},
  numero = {},
  pages = {11--27},
  ISSN = {0171-8630},
  year = {2015},
  DOI = {10.3354/meps11429},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00013728},
}