Isotopic and elemental composition of primary producers in the Patos Lagoon estuary

Isotopic (δ13C, δ15N) and total inorganic carbon (TOC) and total nitrogen (TN) values of estuarine primary producers were sampled seasonally from summer 2010 to autumn 2016 in a shallow shoal in the Patos Lagoon estuary. Primary producers include C3 (Scirpus spp.) and C4 (Spartina densiflora) salt marsh plants, ephemerous macroalgae (Ulvophyceae) and the widgeon grass Ruppia maritima. Particulate (POM) and sedimentary (SOM) organic matter were also sampled as proxies for phytoplankton and microphytobenthos, respectively. This dataset has subsidized several ecological studies and provides valuable information on the isotopic and elemental patterns among estuarine primary producers and their temporal variability.