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Forest disturbance can alter light and nutrient regimes in small streams, which in turn may influence grazer–periphyton interactions within the stream community. To investigate the influence of forest disturbance on grazer–periphyton interactions, we tested the effects of light, nutrients, and grazing by tadpoles of the tailed frog (Ascaphus truei) on periphyton standing crop and tadpole growth rates in 2 coastal streams. Periphyton biomass was found to be under simultaneous control by light and tadpole grazing. Light exerted a strong, positive effect on periphyton standing crop and tadpole relative growth rate, indicating a tight trophic coupling between grazers and their algal food resource. Tadpole growth rate decreased significantly with increasing tadpole density, showing that tadpoles are subject to intraspecific density-dependent interactions. The 2 streams differed in both abiotic limitation of periphyton biomass and tadpole growth...
Kim, Micheline A., Richardson, John S.. 1999. Effects of Light and Nutrients on Grazer-Periphyton Interactions (in Proc. Conference Biology & Management of Species and Habitats at Risk). Ministry of Environment, Lands and Parks. Conference Biology & ManagementProceedings. Vol. 2
Other Identifier: University College of the Cariboo
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