We compared volumetric and linear measurements as predictors for biomass in Scarabaeidae. Linear measurements were performed with calipers. Volumetric measurements were performed on a battery-powered top-loading balance, by using Archimedes’ Principle. Of four different linear variables, the most accurate predictor of biomass was the log transformation of elytra pronotum length, which explained 93% of the variation in biomass. The log-transformed beetle volume achieved nearly the same degree of accuracy, explaining 91% of beetle biomass. Because beetle volume has several additional advantages, such as ease of measurement and potential longevity of measurement on older specimens, we propose that volumetric measurements may provide accurate estimates of biomass, where the linear relationship of volume and biomass has been determined, as is the case with fresh specimens.
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Vol. 98 • No. 4