This dataset comprises biological and biogeochemical measurements collected during a complete tidal cycle in the Bahía Blanca Estuary (Argentina). The dataset includes phytoplankton and mesozooplankton taxonomic composition and abundance, chlorophyll-a concentrations, dissolved inorganic nutrient concentrations (nitrite, nitrate and ammonia), and fatty acid profiles. Samples were collected at multiple time points spanning different tidal phases (high tide, flood, ebb, and low tide) to characterize short-term variability associated with tidal dynamics. The data provide an integrated description of plankton community composition and trophic-related variables in a turbid estuary and can be used for studies on estuarine ecology and trophic dynamics.This table contains fatty acid concentration data derived from water samples collected during a tidal cycle in the Bahía Blanca Estuary (Argentina). Surface samples (0.5 m depth) were collected using a Van Dorn bottle at discrete time points corresponding to different tidal phases. Samples were subsequently size-fractionated into three particulate size classes (200 µm) prior to fatty acid analysis. Fatty acid concentrations are reported as micrograms per liter (µg/l). The dataset provides information on the biochemical composition of particulate organic matter across tidal phases.

Fatty acids (FAMEs) were determinded by using the Gas chromatograph, Agilent Technologies, 7890B (FID) followed by the Mass selective detector, Agilent Technologies, 5977A MSD. The analytical conditions according to Vigliano Relva et al. (2024, doi:10.1007/s00227-023-04343-9)