Abstract

Gammarus mucronatus Say is a common amphipod in salt-marsh pools of eastern Canada. It showed no or weak enzymatic activity toward structural plant polysaccharides, but could digest starch and laminarin. It possessed several enzymes capable of breaking glycosidic linkages in small molecules, similar to those that might be released during microbial breakdown of plant polysaccharides. G. mucronatus extracts were able to release sugars and amino acids from Spartina alterniflora Loisel, Enteromorpha sp., Cladophora sp. and mud collected from salt-marsh pools. A cellulase, produced by Buergenerula spartinae Kohlmeyer & Gessner on Spartina alterniflora, remained active when ingested by Gammarus mucronatus Spartina detritus accounted for between 4 and 27% of the gut content of Gammarus mucronatus collected from pools.

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