Environmental and phytoplankton data for comparison across a gradient of freshwater inflow within San Antonio Bay, Nueces-Corpus Christi Bay, and Baffin Bay, Texas from 2018-03-13 to 2019-07-11

Data were used to describe environmental conditions and phytoplankton communities among three Texas estuaries (San Antonio Bay, Nueces-Corpus Christi Bay, Baffin Bay) with a gradient in freshwater inflow. Data were collected monthly from sites in San Antonio Bay (n=4) receiving high freshwater inflow, Nueces-Corpus Christi Bay (n=4) – a neutral estuary, and Baffin Bay (n=6), a low-inflow lagoonal system that is frequently hypersaline. Observations include environmental (physical, chemical), phytoplankton (chlorophyll a, biovolume) and composition (algal group biovolume) parameters over a 17-month period.