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 samples (NEON sample class: apl_domainLab_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 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.