TABLE 4. Results from boosted regression tree models for nonmetric multidimensional scaling axis 1 in DNA metabarcoding effectively quantifies diatom responses to nutrients in streams

TABLE 4. Results from boosted regression tree models for nonmetric multidimensional scaling axis 1 scores and for each diatom metric showing deviance explained as a percentage of the null deviance for observed data and of deviance explained using crossvalidated (CV) data (i.e., 10-fold cross-validation of data withheld to examine predictive performance), CV correlations between raw and fitted values, and relative importance of predictor variables. Relative importance (%)ResponseObserved deviance explained (%)CV deviance explained (%)CV correlationTPTNConductivityNMDS axis 16148 + 90.72 + 0.04521532Low P diatoms5545 + 40.69 + 0.0374917High P diatoms6449 + 50.71 + 0.03571924Low N diatom6148 + 50.70 + 0.03443620High N diatoms5032 + 70.60 + 0.03394021 Note: Mean + SE is presented for CV values.