We performed a field survey to assess changes in biomass, nutrient ratios, and isotopic signatures of three different microbial mat types in two glacial meltwater streams in the McMurdo Dry Valleys, Antarctica. Samples were taken in January 2013 from pre-existing transects over Von Guerard Stream and the Relict Channel, and stretched from near the Von Guerard Glacier terminus to the stream outlets at Lake Fryxell.
Surface water and hyporheic porewater samples were collected at high frequency over two periods (01/20/2018–01/21/2018 and 01/10/2019–01/12/2019) from the lower reaches of Von Guerard Stream, Taylor Valley. Porewater samples were collected using plastic tubing inserted to depths of 15 or 30 cm and drawn out by syringe. This data set shows sampling locations, water chemistry (including concentrations for dissolved organic nitrogen species, dissolved organic carbon, silica, as well as water isotopes).