Appendix 1-b metrics used to describe characteristics of benthic macroinvertebrate assemblages as described in the California Stream Bioassessment Procedure and proposed Central Coast Index of Biotic Integrity




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APPENDIX 5.7.1-B
Metrics used to describe characteristics of benthic macroinvertebrate assemblages as described in the California Stream Bioassessment Procedure

and proposed Central Coast Index of Biotic Integrity

BMI Metric


Description

Response to

Impairment

Richness Measures

1. Taxonomic Richness

Total number of individual taxa.

Decrease

2. EPT Taxa

Number of taxa in the orders Ephemeroptera (mayfly), Plecoptera (stonefly) and Trichoptera (caddisfly)

Decrease

3. Ephemeroptera Taxa

Number of mayfly taxa

Decrease

4. Plecoptera Taxa

Number of stonefly taxa

Decrease

5. Trichoptera Taxa

Number of caddisfly taxa

Decrease

Composition Measures

6. EPT Index

Percent composition of mayfly, stonefly and caddisfly larvae

Decrease

7. Sensitive EPT Index

Percent composition of mayfly, stonefly and caddisfly larvae with CTVs less than 4.

Decrease

8. Shannon Diversity Index

General measure of sample diversity that incorporates richness and evenness (Shannon and Weaver 1963).

Decrease

Tolerance/Intolerance Measures

9. Tolerance Value (TV)

CTVs between 0 and 10 weighted for abundance of individuals designated as pollution tolerant (higher values) and intolerant (lower values).

Increase

10. Percent Intolerant Organisms

Percentage of organisms that are highly intolerant to water and/ or habitat quality impairment as indicated by CTVs of 0, 1 or 2.

Decrease

11. Percent Tolerant Organisms

Percentage of organisms that are highly tolerant to water and/ or habitat quality impairment as indicated by CTVs of 8, 9 or 10.

Increase

12. Percent Dominant Taxon

The highest percentage of organisms represented by one taxon.

Increase

Functional Feeding Groups (FFG)

13. % Collector-gatherers (cg)

Percent of macroinvertebrates that collect or gather material

Increase

14. % Collector-filterers (cf)

Percent of macroinvertebrates that filter suspended material from the water column

Increase

15. % Scrapers (sc)

Percent of macroinvertebrates that graze upon periphyton

Variable

16. % Predators (p)

Percent of macroinvertebrates that prey on living organisms

Decrease

17. % Shredders (sh)

Percent of macroinvertebrates that shred leaf litter

Decrease

18. % Others (ot)

Percent of macroinvertebrates that occupy an FFG not described above

Variable

Other

19. Abundance

Estimate of the number of BMIs in a sample based on the proportion of BMIs subsampled.

Variable



Proposed Metrics for Development of Central Coast Index of Biotic Integrity*

Metric

Description

Response to Impairment

Percent Intolerant Individuals

Percentage of organisms that are highly intolerant to water and/ or habitat quality impairment as indicated by CTVs of 0, 1 or 2.

Decrease

Percent Collector-Gatherer + Collector-Filterer Individuals

Percentage of organisms that collect or gather food and organisms that collect or filter food according to the functional feeding group model.

Increase

Percent Non-Insect Taxa

Percentage of taxa that fall into non-insect taxonomic groups.

Increase

Percent Tolerant Taxa

Percentage of organisms that are highly tolerant to water and/ or habitat quality impairment as indicated by CTVs of 8, 9 or 10.

Increase

Coleoptera Richness

Number of taxa that fall within the order of aquatic beetles (order Coleoptera).

Decrease

Predator Richness

Number of taxa that prey on living organisms; these taxa are within the “predator” functional feeding group.

Decrease

EPT Richness

Number of taxa in the orders Ephemeroptera (mayfly), Plecoptera (stonefly) and Trichoptera (caddisfly).

Decrease



* Developed by Ode et al. (2003; in review)


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