David L. Strayer and David R. Smith
Published by American Fisheries Society, June 2003
Assessing mussel populations accurately and efficiently requires knowledge of both statistical principles and mussel biology. The purpose of this guide is to provide practical advice to environmental professionals to help them choose sound designs and methods for assessing freshwater mussel populations. The authors critically review sampling designs and methods that might be useful for sampling freshwater mussel populations and offer exemplary designs to meet several common objectives. The guide is largely compiled from published works, although some new, unpublished material is included, and brings together into a coherent, compact form the information needed to design mussel surveys and assessments.
This book will be particularly useful to:
* freshwater ecologists, * conservation biologists, and * malacologists.
Table of Contents
Preface Symbols and Abbreviations Abstract
Introduction Five Guiding Considerations and an Important Question
Sampling Designs Complete Coverage of a Study Site Informal Sampling Designs Probability-Based Designs (Design-Based Inference) Simple Random Sampling Systematic Sampling Stratified Sampling Double Sampling Adaptive Sampling Two-Stage Sampling Probability-Based Designs (Model-Based Inference) Regression Designs Mark-Recapture Models Distance Sampling Choice of a Sampling Unit
Methods for Collecting Mussels Visual Searches Sediment Collection Special Methods Impacts of Sampling Activities on Mussels
Making Observations on Mussels
Data Analysis Assessment of Precision and Power before Implementing a Survey Analysis of Observations from a Completed Survey
Sampling Approaches for Some Common Objectives Preliminary Surveys Determining Species Presence or Species Richness at a Single Site Determining Species Presence-Absence across Multiple Sites Determining Population Density or Size within a Defined Area Comparing Mussel Populations at Two or More Sites Detecting an Impact on Mussel Populations Detecting Temporal Change in Mussel Populations
Concluding Remarks Appendix: Learning to Identify Freshwater Mussel Glossary Literature Cited Index