Spatial aggregation, precision, and power in surveys of freshwater mussel populations

J. A. Downing, W. L. Downing

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Studied aggregation in 76 populations of freshwater mussels from relatively homogeneous surroundings in a wide range of habitats. Chi-square tests for spatial aggregation found only 53% of mussel populations significantly aggregated. Sampling mussels with large quadrats requires between five and 25 samples for 20% precision. Sampling designs to determine significant impacts (α = β = 0.05) require 7-50 samples of each population to detect doubling or halving of the population density, or three to nine to detect order-of-magnitude changes. -from Authors

Original languageEnglish (US)
Pages (from-to)985-991
Number of pages7
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume49
Issue number5
DOIs
StatePublished - 1992
Externally publishedYes

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