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Effects of herbivore type and density on chemical composition of algal assemblages in laboratory streams



Effects of herbivore type and density on chemical composition of algal assemblages in laboratory streams



Journal of the North American Benthological Society 6(3): 189-197



The chemical composition of algal assemblages in laboratory streams was determined 3 and 27 d after adding snail (Juga silicula) and larval caddisfly (Dicosmoecus gilvipes) grazers. Three days after the herbivores were introduced (day 8 of algal growth), the fatty acid and amino acid profiles among algal assemblages were similar. Substantial differences were noted after 4 wk (day 32 of algal growth), however, especially with respect to the 16:0, 16:1, 16:3, 18:3, and 20:5 fatty acids. On day 32, algal assemblages subjected to zero or 125 snails/stream (66/m2) had higher levels of glycine, leucine, isoleucine, tyrosine, and the 16:3 and 18:3 fatty acids than assemblages exposed to 500 snails/stream (250/m2), 50 caddis/stream (25/m2), or 200 caddis/stream (100/m2). On the other hand, assemblages subjected to high grazing pressure (i.e., 500 snails/stream, 50 and 200 caddis/stream) had higher levels of alanine, glutamic acid/glutamine, and the 16:0, 16:1, and 20:5 fatty acids than algae exposed to zero or 125 snails/stream. These data provide detailed information on the food quality of lotic algae and may serve as a starting point for future research in this field.

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Accession: 005306975

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DOI: 10.2307/1467510


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