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Estimation of larval dry weight of Chaoborus americanus
Authors:Joseph A Traina  Carl N von Ende
Institution:(1) Department of Biological Sciences, Northern Illinois University, 60115 DeKalb, IL, USA;(2) Present address: Illinois Mathematics and Science Academy, 1500 W. Sullivan Road, 60506-1039 Aurora, IL, USA
Abstract:A method for estimating larval dry weight as a function of tracheal front air sac length and instar was developed for second, third, and fourth instar Chaoborus americanus using linear regression analysis. The following equation: \(W^{0.5} = (L - a)/b,\) where W = larval dry weight (µg), L = front air sac length (mm), a = the y-intercept, and b = the slope provided accurate estimates of larval dry weight for three C. americanus populations. No detectable change in size occurred in the air sacs of larvae preserved for one year in 5% formalin. This indicates that air sacs can be used to accurately estimate larval dry weight for preserved as well as living specimens.
Keywords:Chaoborus americanus            dry weight  air sac length  instar
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