Camacho-Cruz, K.A., N., Rey-Villers, M.C., Ortíz-Hernández, P., González-Jones, R.d.J., Galán-Caamal, M., Matus-Hernández & A., Sánchez (2022). Changes in the enrichment of dissolved inorganic nutrients in the coastal waters of the Mexican Caribbean, influenced by submarine groundwater discharges 2016–2019. Marine Pollution Bulletin. 185: 114308. DOI: 10.1016/j.marpolbul.2022.114308.
Karla Andrea Camacho-Cruz 1, Néstor Rey-Villers 1, María Concepción Ortíz-Hernández 2, Paula González-Jones 1, René de Jesús Galán-Caamal 2, Miguel Matus-Hernández 3 y Alberto Sánchez 4
The resident and tourist population in the Mexican Caribbean has grown exponentially, increasing the availabilityof dissolved inorganic nutrients in coastal waters through submarine groundwater discharge (SGD).Recently, a new massive drift of Sargassum spp. has occurred that can provide new organic matter and enrichcoastal water with nutrients. In different sites in the Mexican Caribbean, the chemical composition of the waterwas analyzed, and the d15N of Thalassia testudinum was determined between 2016 and 2019. Evidence of SGDwas observed in Akumal Bay due to high silicate concentrations and its negative correlation with salinity.Seasonal and interannual variation in NH4+ concentration was observed at these sites. In October 2018, SGDcontributed ~70 times more nitrogen and ~194 times more phosphorus than the decomposition of the pelagicmacroalgae Sargassum spp. The d15N data showed that Akumal Bay received nitrogen of anthropogenic originand that nitrogen fixation processes or probably assimilation of nitrogen of the leachates of pelagic Sargassum spp
were dominant at Mahahual and Xahuayxol.
Palabras clave: nutrients; stable nitrogen isotopes; Sargassum spp.; Submarine groundwater discharge (SGD); Mexican Caribbean
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