@article{fdi:010096343, title = {{J}ellyfish-specific trophic footprint : {O}belia sp. bloom reshapes plankton biomass flow in a coastal lagoon}, author = {{L}ópez-{A}bbate, {M}. {C}. and {G}ilabert, {A}. {S}. and {L}ee, {S}. and {M}olinero, {J}uan-{C}arlos and {B}onnet, {D}.}, editor = {}, language = {{ENG}}, abstract = {{G}elatinous zooplankton are often represented as a single functional group in ecosystem-wide frameworks and biogeochemical models, despite growing evidence that species-specific feeding traits and seasonal dynamics may lead to contrasting planktonic responses. {H}ere, we compared plankton community structure and biomass flow across three different years, including one year characterized by a bloom of {O}belia sp., a microphagous, filter-feeding hydromedusa, and two non-bloom years. {D}uring the bloom year, patterns in plankton biomass were consistent with an enhanced role of microbial pathways, with bacterial abundance positively associated with {O}belia sp., potentially reflecting increased availability of jellyfish-derived dissolved organic matter. {T}his was accompanied by transient increases in nanoflagellates and ciliates, compatible with a short-lived microbial cascade in which these groups may have contributed to prey availability for {O}belia sp. {A}t the same time, weak coupling between bacteria and their grazers during the bloom suggests that a substantial fraction of jelly-derived organic matter may have been processed through bacterial respiration rather than transferred efficiently to higher trophic levels. {F}ollowing the bloom, the community exhibited fewer interactions among the groups assessed in this study, along with a poor recovery of mesozooplankton biomass in the subsequent year. {A}lthough the {O}belia sp. bloom declined rapidly, lasting less than a month, its effects on microbial community structure through its selective feeding on motile protists were more persistent. {T}aken together, these observations are consistent with the hypothesis that intense {O}belia sp. blooms can coincide with transient reorganization of planktonic trophic pathways, although broader inference is limited by the observational nature of the study and the occurrence of a single bloom event.}, keywords = {{O}belia sp. bloom ; {M}icrobial networks ; {P}lankton ; {T}hau lagoon ; {M}editerranean ; {FRANCE} ; {MEDITERRANEE} ; {THAU} {ETANG}}, booktitle = {}, journal = {{M}arine {E}nvironmental {R}esearch}, volume = {216}, numero = {}, pages = {107906 [11 ]}, ISSN = {0141-1136}, year = {2026}, DOI = {10.1016/j.marenvres.2026.107906}, URL = {https://www.documentation.ird.fr/hor/fdi:010096343}, }