SAMPLES ARE CURRENTLY UNAVAILABLE. Please contact the NEON Biorepository for information about when these samples will become available. Subsample for aquatic macroalgae taxonomy from clip harvest and point counts (NEON sample classes: apl_domainLab_in.sampleIDmacroalgae, apc_perTaxon_in.sampleIDmacroalgae). Aquatic macroalgae clip harvest samples are collected in wadeable streams, rivers, and lakes. Clip harvest samples are collected once per year during the mid-summer aquatic biological sampling bout, and additional presence/absence data are collected in lakes and rivers during bouts 1 and 3 (similar to point transect data for streams). Grab samples are collected from a known benthic area, separated by taxon in the domain lab, identified, and processed for dry mass and ash-free dry mass. Aquatic macroalgae point counts samples are collected at 10 permanent transects in wadeable streams three times per year. Aquatic macroalgae samples are preserved in 2% glutaraldehyde. Samples are archived in 20 mL glass scintillation vials and stored in a temperature (17-18°C) and humidity controlled environment. See AOS Protocol and Procedure: Aquatic Plant, Bryophyte, Lichen and Macroalgae Sampling and the NEON Aquatic Sampling Strategy (https://data.neonscience.org/documents) for more information about this sample class. NEON datasets (https://data.neonscience.org/home) associated with this sample class include Aquatic Plant Bryophyte Macroalgae Clip Harvest and Aquatic Plant, Bryophyte, Lichen, and Macroalgae Point Counts in Wadeable Streams.