@article{fdi:010080923, title = {{I}mpact of nutrient availability on the trophic strategies of the planktonic protist communities in a disturbed {M}editerranean coastal lagoon}, author = {{L}eruste, {A}. and {G}arrido, {M}. and {M}alet, {N}. and {B}ec, {B}. and {D}e {W}it, {R}. and {C}ecchi, {P}hilippe and {P}asqualini, {V}.}, editor = {}, language = {{ENG}}, abstract = {{T}he impact of changes in nitrogen ({N}) and phosphorus ({P}) availability on the trophic strategies of planktonic protists was evaluated in a disturbed {M}editerranean lagoon ({B}iguglia lagoon, {F}rance) using short-term bioassays. {N}atural communities were collected in three periods, i.e., autumn, spring and summer, to address the influence of the different environmental conditions. {T}he responses of autotrophic plankton communities to experimentally induced {N} and/or {P} limitations were assessed as changes in chlorophyll a ({C}hl a) concentrations and in the abundances of potentially mixotrophic protists taxa. {W}e observed blooms (> 10(5) cells l(-1)) of nanoflagellates in autumn, and of phycocyanin-rich picocyanobacteria in summer. {C}ommunities showed a co-limitation by {N} and {P} at the three sampling periods, despite high {N}:{P} ratios in autumn and spring. {T}he high abundances of potentially mixotrophic dinoflagellates during these periods suggest the involvement of alternative trophic pathways for their maintenance in the lagoon. {A}fter bioassay incubations using different nutrient enrichment treatments, we often observed reduced abundances of mixotrophic protists containing {C}hl a with a concomitant increased abundance of protists without {C}hl a. {T}his indicates a loss of chloroplasts and photoautotrophic abilities in protists cells, possibly reflecting a shift towards heterotrophy that could be sustained by phagotrophy.}, keywords = {{G}rowth rate ; {D}inoflagellates ; {N}utrient limitation ; {M}ixotrophy ; {FRANCE} ; {CORSE} ; {MEDITERRANEE} ; {BIGUGLIA} {ETANG}}, booktitle = {}, journal = {{H}ydrobiologia}, volume = {848}, numero = {}, pages = {1101--1119}, ISSN = {0018-8158}, year = {2021}, DOI = {10.1007/s10750-021-04517-w}, URL = {https://www.documentation.ird.fr/hor/fdi:010080923}, }