Hydrological, physicochemical, and microbial characterization of the Mar Menor lagoon and its groundwater sources - General dataset

First release of the Mar Menor SGD general dataset. This dataset contains detailed information on groundwater and lagoon water collected in the Mar Menor coastal lagoon (SE Spain) from March 2021 to May 2022. This dataset contains detailed information on stream water, groundwater, lagoon water, and soils collected in the Mar Menor coastal lagoon (SE Spain) from March 2021 to May 2022. The data includes physicochemical parameters (e.g., temperature, salinity, pH, dissolved oxygen), radionuclide activities (e.g., Ra-223, Ra-224, Ra-226, Ra-228), dissolved nutrient concentrations (NO3-, NO2-, NH4+, Si(OH)4, PO43-, TDN), dissolved organic carbon concentrations (DOC), microbial parameters (e.g., total bacterial abundance, HNA fraction, 3H-leucine incorporation rates), and mercury chemical species (total dissolved mercury and dissolved methylmercury). This dataset was used to estimate the magnitude of different SGD pathways, including pollutant fluxes to the lagoon, and interpret their impact on microbial communities.