What question did this study set out to answer?

To establish a universal variance-stabilizing transformation and determine optimal sampling designs for freshwater macrobenthos in lakes and large rivers.

December 1, 1979Journal of the Fisheries Research Board of Canada

Aggregation, Transformation, and the Design of Benthos Sampling Programs

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Authors

JDJohn DowningMinnesota Sea Grant

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Implication

Methodological study demonstrates fourth-root transformation stabilizes variance across freshwater macrobenthos, indicating small samplers optimize precision.

Key Points

To establish a universal variance-stabilizing transformation and determine optimal sampling designs for freshwater macrobenthos in lakes and large rivers.
Analyzed published literature data on freshwater benthic organisms collected across diverse substrates and sampler types.
Assessed density-variance power relationships across taxa to evaluate candidate variance-stabilizing transformations.
Derived an empirical multiple regression model linking standard deviation to benthic mean density and sampler surface area.
A fourth-root transformation successfully stabilized variance across all macrobenthos taxa, whereas standard square root and logarithmic transformations failed.
Standard deviation was predictable across taxa using the model: log10(s) = 0.581 + 0.696 log10(M) - 2.82 × 10^-4(A).
Sampling precision increased at higher macrobenthos densities, and small-diameter samplers provided the highest precision per unit effort.

Cite This Study

John Downing (1979) studied this question.

synapsesocial.com/papers/6a9a7b736bb205df309e6feb https://doi.org/10.1139/f79-212

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Implication

Methodological study demonstrates fourth-root transformation stabilizes variance across freshwater macrobenthos, indicating small samplers optimize precision.

Aggregation, Transformation, and the Design of Benthos Sampling Programs

Discussion

Member takes

Implication

Key Points

Cite This Study

Aggregation, Transformation, and the Design of Benthos Sampling Programs

Discussion

Member takes

Implication

Key Points

Cite This Study

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