Biotic Indexing             = FUN!(Picking for the bugs and other             critters)
Why?• One-third of the data we’ll get for  determining a river’s health is biological
Invertebrates• Spineless:• Mostly Insects• Life Cycle: Many  insects start their life  in water• Larval or Nymph
Nymph vs. Larvae
Canary in a Coal Mine• They are very sensitive• Some more than others
How?With respect!– To them– To environment– To people after youWith CareGet a rock------search it carefully-----grab the  ...
Careful observation and care          needed
There are 2 Indices• EPT Index (Ephemeroptera, Plecoptera, Trichoptera)  A measure of the variety of insects.             ...
Biotic indexing
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Biotic indexing

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Biotic indexing

  1. 1. Biotic Indexing = FUN!(Picking for the bugs and other critters)
  2. 2. Why?• One-third of the data we’ll get for determining a river’s health is biological
  3. 3. Invertebrates• Spineless:• Mostly Insects• Life Cycle: Many insects start their life in water• Larval or Nymph
  4. 4. Nymph vs. Larvae
  5. 5. Canary in a Coal Mine• They are very sensitive• Some more than others
  6. 6. How?With respect!– To them– To environment– To people after youWith CareGet a rock------search it carefully-----grab the critter-----put in pan------return the rock where it came from--------get more----- identify and tally them----- put them back
  7. 7. Careful observation and care needed
  8. 8. There are 2 Indices• EPT Index (Ephemeroptera, Plecoptera, Trichoptera) A measure of the variety of insects. ---AND---• Biotic Index Based on sensitivity of insects to pollution

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