@article{fdi:010075255, title = {{S}patio-temporal variability in benthic exchanges at the sediment-water interface of a shallow tropical coastal lagoon (south coast of {G}ulf of {M}exico)}, author = {{G}renz, {C}. and {M}oreno, {M}. {O}. and {S}oetaert, {K}. and {D}enis, {L}. and {D}ouillet, {P}ascal and {F}ichez, {R}enaud}, editor = {}, language = {{ENG}}, abstract = {{T}he sediment in {L}aguna de {T}erminos, the largest and shallowest system in the {S}outhwest portion of the {G}ulf of {M}exico features a broad range of ecological and hydrobiological characteristics driven by annual weather cycles (dry and wet seasons), causing large salinity gradients during the wet season due to large river discharges. {F}our sampling campaigns were carried out during the wet and the dry seasons in 2009 and 2010 on a selection of 13 out of 35 stations. {M}easurements of {S}ediment {O}xygen {D}emand ({SOD}) and nutrient fluxes at the sediment-water interface were performed using lab incubations with 15 cm diameter sediment cores. {SOD} fluctuated between 1327 +/- 161 and 2248 +/- 359 mu mol m(-2) h(-1) for dry and wet seasons respectively. {S}ilicate effluxes were also significantly higher during the wet seasons (89.4 +/- 15.9 mu mol m(-2) h(-1)) than during the dry season (46.5 +/- 11.4 mu mol m(-2) h(-1)). {PO}4 fluxes were low all over the study period without seasonal trend. {N}o significant difference was measured for {DIN} fluxes but there was a tendency for {DIN} uptake during the wet season (-2.9 +/- 18.8 mu mol m(-2) h(-1)) and conversely an efflux during the dry season (24.3 +/- 7.3 mu mol m(-2) h(-1)). {SOD} correlated to organic matter and chloropigment content of the sediments while silicate fluxes responded to enhanced chloropigments in the sediments. {D}uring both seasons, total benthic nutrient fluxes overwhelmed largely riverine inputs and benthic carbon mineralization rates approximated a significant proportion of the pelagic organic carbon production. {W}e conclude that benthic processes in {L}aguna de {T}erminos are largely driven by weather variability and that they contribute substantially to carbon and nutrient budgets in this shallow subtropical system.}, keywords = {{E}stuarine sediment ; {B}enthic respiration ; {N}utrient fluxes ; {S}table isotopes ; {C}:{N} ratio ; {ATLANTIQUE} ; {MEXIQUE} ; {MEXIQUE} {GOLFE} ; {TERMINOS} {LAGON}}, booktitle = {}, journal = {{E}stuarine {C}oastal and {S}helf {S}cience}, volume = {218}, numero = {}, pages = {368--380}, ISSN = {0272-7714}, year = {2019}, DOI = {10.1016/j.ecss.2019.01.012}, URL = {https://www.documentation.ird.fr/hor/fdi:010075255}, }