A Guide to Sampling Freshwater Mussel PopulationsAmerican Fisheries Society, 2003 - 103 pagine The objective of this guide is to help field biologists conduct better surveys of freshwater mussel populations. It opens with a discussion of several considerations and a question that should direct the design of any study of mussel populations. The authors then present sampling designs and methods that may be useful to mussel biologists. The also discuss examples of study designs that address several common objectives of studies of mussel populations. |
Sommario
INTRODUCTION | 1 |
DATA ANALYSIS | 33 |
METHODS FOR COLLECTING MUSSELS | 47 |
Copyright | |
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Parole e frasi comuni
abundance adaptive sampling analysis assess BACI design Bivalvia brail Cacapon River capture rates catch rates change in mussel clubshell Coefficient of variation collect mussels confidence interval defined detect temporal change difference distance sampling double sampling eastern elliptio ecological estimate population estimates of mussel example excavation Figure freshwater mussel populations freshwater mussels habitat impact informal sampling investigator mark-recapture methods mollusks mussel density mussel identification mussel populations mussel species mussel surveys number of mussels number of quadrats number of samples objectives open-population parametric statistical permanent plots pling population density probability of detecting quadrats or transects random starts range rare species regression sampling designs sampling effort sampling unit sediment selected setup costs simple random sampling Smith statistical power strata stratified Strayer stream strip transects study area substrate surface survey design systematic sampling target population target species temporary emigration tion two-stage sampling unionid mussels Unionidae variable variance visual searches