Impacts on excretion of simulated tradeoffs between predator biomasses.

Abstract

<p>Estimated total recycled N (NH₄) and P (SRP) excretion (g·day⁻¹) in Fox Cr. due to simulated changes in the relative abundance (by biomass) of <i>O. mykiss</i> and <i>D. tenebrosus</i>. Simulations assumed a fixed total biomass of predators (6275 g) within the study reach, and estimated total excretion rates (left y-axis) and ratios (right y-axis) by bootstrapped re-sampling of surveyed individuals. Predator relative abundance (x-axis) varies by 10% increments from 100% <i>O. mykiss</i> composition to 100% <i>D. tenebrosus</i> composition, expressed as the proportion of predator biomass (salamander:fish). Vertical line indicates the observed ratio of predators in Fox Cr.</p