This file contains estimated dry weight and numerical densities for 17 stream communities in New Zealand. Dry weight estimates and numerical densities were calculated as described in main text. Columns: "food.web" indicates which community the data come from. "taxa" is a character string for each taxon found in the community which has data on dry weights and abundance. "dw" is the estimated dry weight in grams for a given taxa. "no.m2" is the estimated number of individuals per meter squared.