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An evaluation of benthic macroinvertebrate biomass methodology: Part 1. Laboratory analytical methods by William T. Mason; Philip A. Lewis; Cornelius I. Weber is a Environmental Science article available to read on EtoBox.

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Evaluation of analytical methods employed for wet weight (live or preserved samples) of benthic macroinvertebrates reveals that centrifugation at 140 • gravity for one minute yields constant biomass estimates. Less relative centrifugal force increases chance of incomplete removal of body moisture and results in weighing error, while greater force may rupture fragile macroinvertebrates, such as mayflies. Duration of specimen exposure in ethanol, formalin, and formol (formaling-ethanol combinations) causes significant body weight loss with within 48 hr formalin and formol cause less body weight loss than ethanol. However, as all preservatives tested cause body weight loss, preservation time of samples collected for comparative purposes should be treated uniformly. Dry weight estimates of macroinvertebrates are not significantly affected by kind of preservative or duration of exposure. Constant dry weights are attained by oven drying at 103 ~ at a minimum of four hours or vacuum oven drying (15 inches of mercury pressure) at 103 ~ for a minimum of one hour. Although requiring more time in preparation than oven drying and inalterably changing specimen body shape, freeze drying (10 micr

Who reads An evaluation of benthic macroinvertebrate biomass methodology: Part 1. Laboratory analytical methods?

Author

William T. Mason; Philip A. Lewis; Cornelius I. Weber

Publisher

Springer; Springer-Verlag; Kluwer Academic Publishers; Springer Science and Business Media LLC; Publons; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0167-6369)

Published

1983

Language

EN

Field

Environmental Science (Physical Sciences)