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POWER-COST EFFICIENCY OF EIGHT MACROBENTHIC SAMPLING SCHEMES IN PUGET SOUND, WASHINGTON, USA
Citation:
Ferraro, S., F. Cole, W. DeBen, AND R. Swartz. POWER-COST EFFICIENCY OF EIGHT MACROBENTHIC SAMPLING SCHEMES IN PUGET SOUND, WASHINGTON, USA. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-89/289 (NTIS PB90196650).
Description:
Power-cost efficiency (PCEi = (n x c)min/(n, x, c,), where i = sampling scheme, n=minimum number of replicate samples needed to detect a difference between locations with an acceptable probability of Type 1 (a) and Type II (B) error (e.g. a = B = 0.05),c = mean "cost," in time or money, per replicate sample, and (n x c)min = minimum value of (n x c) among the i sampling schemes) is the appropriate expression for comparing the cost efficiency of altenrative sampling schemes having equivalent statistical rigor when the statistical model is a t-distribution for comparisons of two means. CEs were determined for eight macrobenthic sampling schemes (four sample unit sizes and two sieve mesh sizes) in a comparison of a reference site versus a putative polluted site in Puget Sound, washington. aboratory processing times were, on average, about 2.5 times greater for the >0.5-than the >1.0-mm samples. he 0.06-m2, 0- to 8-cm-deep sample unit size and 1.0-mm sieve mesh size was the overall optimum sampling scheme in this study; it ranked first in PCE on 8 and second on 3 of 11 measures of community structure. ank order by statistical power of the 11 measures for this scheme was Infaunal Index > log10 (mollusc biomass + 1) > number of species > log10 (numerical abundance) > log10 (polychaete biomass +1) > log10 (total biomass + 1) > log 10 (crustacean biomass + 1) > McIntosh's Index > 1 - Simpson's Index > Shannon's Index > Dominance Index.
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POWER-COST EFFICIENCY OF EIGHT MACROBENTHIC SAMPLING SCHEMES IN PUGET SOUND, WASHINGTON, USA