@article{fdi:010070340, title = {{S}ignificant change in marine plankton structure and carbon production after the addition of river water in a mesocosm experiment}, author = {{F}ouilland, {E}. and {T}rottet, {A}. and {A}lves-de-{S}ouza, {C}. and {B}onnet, {D}. and {B}ouvier, {T}. and {B}ouvy, {M}arc and {B}oyer, {S}. and {G}uillou, {L}. and {H}atey, {E}. and {J}ing, {H}. and {L}eboulanger, {C}hristophe and {L}e {F}loc'h, {E}. and {L}iu, {H}. and {M}as, {S}. and {M}ostajir, {B}. and {N}ouguier, {J}. and {P}ecqueur, {D}. and {R}ochelle {N}ewall, {E}mma and {R}oques, {C}. and {S}alles, {C}. and {T}ournoud, {M}. {G}. and {V}asseur, {C}. and {V}idussi, {F}.}, editor = {}, language = {{ENG}}, abstract = {{R}ivers are known to be major contributors to eutrophication in marine coastal waters, but little is known on the short-term impact of freshwater surges on the structure and functioning of the marine plankton community. {T}he effect of adding river water, reducing the salinity by 15 and 30%, on an autumn plankton community in a {M}editerranean coastal lagoon ({T}hau {L}agoon, {F}rance) was determined during a 6-day mesocosm experiment. {A}dding river water brought not only nutrients but also chlorophyceans that did not survive in the brackish mesocosm waters. {T}he addition of water led to initial increases (days 1-2) in bacterial production as well as increases in the abundances of bacterioplankton and picoeukaryotes. {A}fter day 3, the increases were more significant for diatoms and dinoflagellates that were already present in the {T}hau {L}agoon water (mainly {P}seudo-nitzschia spp. group delicatissima and {P}rorocentrum triestinum) and other larger organisms (tintinnids, rotifers). {A}t the same time, the abundances of bacterioplankton, cyanobacteria, and picoeukaryote fell, some nutrients ({NH}4 (+), {S}i{O}4 (3-)) returned to pre-input levels, and the plankton structure moved from a trophic food web based on secondary production to the accumulation of primary producers in the mesocosms with added river water. {O}ur results also show that, after freshwater inputs, there is rapid emergence of plankton species that are potentially harmful to living organisms. {T}his suggests that flash flood events may lead to sanitary issues, other than pathogens, in exploited marine areas.}, keywords = {{F}lood impact ; {C}oastal ecosystems ; {P}lanktonic food web ; {P}otentially ; harmful species ; {FRANCE} ; {THAU} {ETANG} ; {ZONE} {MEDITERRANEENNE}}, booktitle = {}, journal = {{M}icrobial {E}cology}, volume = {74}, numero = {2}, pages = {289--301}, ISSN = {0095-3628}, year = {2017}, DOI = {10.1007/s00248-017-0962-6}, URL = {https://www.documentation.ird.fr/hor/fdi:010070340}, }