Abstract
SUMMARY. I. Stream sediment with a natural biofilm generally adsorbed more glycine, aspartic acid, and lysine than sterile sediment. Lysine was adsorbed to a greater extent than the other two amino acids.2. In the presence of Ca2+, adsorption of aspartic acid increased and adsorption of lysine decreased. Glycine was not affected.3. Stream sediment preferentially removed amino acids with a positive charge or a polar R group from maple leaf leachate.4. It is estimated that stream invertebrates may have access to a maximum of 7.3% of the amino acids present in epilithic biofilms. More amino acids were available from biofilms exposed to leaf leachate.
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