R. Whitman, J. M. Inglis, W. J. Clark, R. W. Clary
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An Inexpensive and Simple Elutriation Device for Separation of Invertebrates from Sand and Gravel
A new device for separation of stream invertebrates is described and its performance evaluated. The "cone elutriator" consists of a Schleicher and Schuell filtering apparatus attached to a standard Imhoff cone. Excellent recovery of organisms, ranging in length from 0.7 to 26 mm, was observed. Mean recovery from sand (excluding molluscs) was 93% and 98% from gravel. It appears that cross-sectional density is more important than the size of an organism in elutriation yield. Except for molluscs, no significant differences between sand and gravel extractions were observed (p=0.01).
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