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MACROINVERTEBRATE IDENTIFICATION

MACROINVERTEBRATE IDENTIFICATION. Developed by Mike Clapp, CAM Junior High School Science Teacher and Judy Bufford, Science Education Consultant Water Resources Education Center. Classification. Kingdom - Animalia Phylum - Arthropoda Class - Insecta Order - Ephemeroptera

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MACROINVERTEBRATE IDENTIFICATION

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  1. MACROINVERTEBRATEIDENTIFICATION Developed by Mike Clapp, CAM Junior High School Science Teacher and Judy Bufford, Science Education Consultant Water Resources Education Center

  2. Classification • Kingdom - Animalia • Phylum - Arthropoda • Class - Insecta • Order - Ephemeroptera • Family - Baetidae • Genus - Baetis • Species – Baetis tricaudata

  3. Incomplete metamorphosis Complete metamorphosis Insects

  4. Body Parts of an Insect • Head - mouth parts, eyes, and antennae. • Thorax - muscles and attachments for the legs and wings. • Abdomen - digestive and respiratory functions. Head Thorax Abdomen

  5. Mayflies (Order Ephemeroptera) 2 plates • 2 - 3 tails = mayfly • Sometimes the center tail is very short • Gills along abdomen • Generally collector gatherers and shredders • Sensitive to pollution head thorax abdomen gills tails or cerci adult

  6. Stoneflies (Order Plecoptera) • Always 2 tails • Gills on thorax • Shredders and predators • Sensitive to pollution 3 plates head Gills on thorax thorax abdomen 2 tails

  7. Caddisflies (Order Trichoptera) • Case builders, net spinners, free living (green rock worms) • Sensitive to pollution • net spinners have fluffy gills on abdomen, free-living have filaments shredders adult predators Filterers/predators

  8. Midges (Order Diptera) • Worm like • Twitchy, jerky swimmers • Pollution tolerant head

  9. Craneflies (Order Diptera) • Cannot see head • Large, long abdomen • Last segment fleshy lobes • Somewhat Tolerant • Other Diptera are more tolerant end

  10. Blackflies (Order Diptera) • Tolerant of Pollution • Attach at end with a ring of hooks • Two fans on top of the head Filter Feeders

  11. Riffle Beetles & Water Pennies (Order Coleoptera) Whitish color • This Order is Very Diverse • Sensitive to Pollution Riffle Beetle Diving beetle Other beetles- Somewhat tolerant

  12. Dobsonflies (Order Megaloptera) • Hair like filaments along abdomen • Long somewhat flattened abdomen • 2 prolegs at the end with two claws on each proleg • Sensitive to Pollution • Note: Alderfly same Order but long pointy tail and more tolerant of pollution

  13. Dragonflies, Damselflies (Order Odonata) • Dragonflies have internal gills • Dragonflies have no tails and a large abdomen • Damselflies have paddle like gills (3) • Predators-engulfers • Somewhat tolerant Dragonflies Damselflies

  14. Water Boatmen & Backswimmer (Order Hemiptera) • Carry a bubble of air • Long back legs used for swimming • Babies look like adults • Pollution Tolerant • Piercing mouthpart Water Boatmen Backswimmer

  15. Crayfish (Order Decapoda) • Crustaceans • 5 pairs of walking legs • Somewhat Tolerant of Pollution

  16. Aquatic Sowbug (Order Isopoda) • Crustaceans • 7 pairs of long walking legs • Body is flattened from top to bottom • Somewhat Tolerant of Pollution

  17. Scuds/ Sideswimmers (Order Amphipoda) • Crustaceans • 7 pairs of walking legs • Body is strongly flattened side to side • Somewhat tolerant of pollution

  18. Snails (Class Gastropoda) • Hard spiral shell • Lunged snails are pollution tolerant • Left Handed / Right handed

  19. Clams & Mussels (Class Bivalvia) • Clams are smaller and rounder than mussels • 2 shells hinged together • Somewhat tolerant of Pollution • Important for stream health because they filter feed and purify the water

  20. Aquatic Earthworm (Class Oligochaeta) • Segmented worm • Tolerant of Pollution

  21. Leeches (Class Hirudinea) • Segmented worm • Suckers on both ends, rear sucker is larger • Tolerant of Pollution

  22. Other macros Water Mites • Somewhat Tolerant • Arachnids – 8 legs Flatworms • No segments • Eyespots • Somewhat Tolerant

  23. Macroinvertebrate Sampling Procedure

  24. Macroinvertebrate sorting

  25. Data Analysis • Pollution Tolerance Index (PTI) • Presence / Absence Scoring • Taxa Richness • Number of different kinds • EPT • Mayflies, Stoneflies, Caddis flies • Percent Diptera (True Flies) • How much of the sample are fly larvae? • Dominance • Which kinds are the most abundant?

  26. Questions?

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