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ILLUSTRATIONS--Continued

  1. Chart showing recommended priority levels for determining the appropriate habitat type to select for semi-quantitative sampling
  2. Schematic diagram of the Slack sampler used to collect benthic invertebrates from wadeable, coarse-grained substrates
  3. Diagram illustrating how semi-quantitative samples could be distributed within a sampling reach
  4. Flow chart indicating how benthic invertebrate samples are processed in the field
  5. Diagram of the diameter markings (A) and the alignment of the sample divider (B) used in sieve diameter sample-splitting procedure
  6. Flow chart illustrating the repeated splitting of elutriate and main-body benthic invertebrate sample components to achieve appropriate sample volumes
  7. Example of a completed internal sample label
  8. Example of a completed external sample label with explanation of the 16-character sample-identification code used by the National Water-Quality Assessment Program
  9. Examples of sample-identification codes generated from one composite sample
    13-17. Example of:
    1. A two-page field data sheet used to record information during the collection of qualitative multihabitat (QMH) samples
    2. Information entered into the instream habitat matrix of the qualitative multihabitat field data sheet
    3. A two-page field data sheet used to record information during the collection of semi-quantitative samples from the faunistically richest- (RTH) and depositional- (DTH) targeted habitats
    4. A two-page field data sheet used to record information during the collection of semi-quantitative samples from snag habitats
    5. A field sample log that lists collection and disposition data for all samples collected

TABLES

    Table
  1. Description of the elements that define the three-tiered hierarchy of instream habitat types targeted for qualitative and semi-quantitative sampling
  2. Abbreviations of study-unit names used in the 16-character sample-identfication code