This is important because inadequate spiraling response curve characterization, and incomplete assessment of the influence of concentration on nutrient retention (i.e., uptake) and export have both been noted as problematic (Dodds et al. 2002; Mulholland et al. 2008). Also, increased data density using the TASCC approach improves extrapolations to estimate ambient spiraling metrics from nutrient addition experiments (e.g., Payn et al. 2005).