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Plecoptera

Plecoptera. Typically clean, cool, running water - rocks, boulders Few in lakes Sensitive indicator taxa. Adults. Riparian vegetation, or on rocks and debris along stream. Larvae. Typically switch food type with development: Usually herbivore-detritivore - switch to omnivore-carnivore

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Plecoptera

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  1. Plecoptera Typically clean, cool, running water - rocks, boulders Few in lakes Sensitive indicator taxa

  2. Adults • Riparian vegetation, or on rocks and debris along stream

  3. Larvae • Typically switch food type with development: • Usually herbivore-detritivore - switch to omnivore-carnivore • Shredders • Predators

  4. Emergence • Through year • Predators - emerge spring-summer

  5. Adult behavior • Males and females drum to communicate • Tap substrate with tip of abdomen

  6. Drumming • Females release eggs over stream surface • Eggs stick to surfaces • http://www.ias.unt.edu/~StoneflyHome/Home/

  7. Life history • Univoltine = annual life cycle • Few are semivoltine = 2-3 generations / year • Hemimetabolous metamorphosis • = incomplete metamorphosis • No pupal stage

  8. Morphology • Gills in some • Cerci - usually 2 • Wingpads • 2 claws at end of each leg

  9. http://www.unb.ca/fredericton/science/biology/Invertebrate_key/Plecoptera/Plecoptera_key_NB.htmhttp://www.unb.ca/fredericton/science/biology/Invertebrate_key/Plecoptera/Plecoptera_key_NB.htm

  10. Be able to ID to family • Gills, mouth parts • Pteronarcyidae - finely branched gills on thorax and first 2 abdomen segments

  11. Pteronarcyidae

  12. No gills on abdomenFinely branched gills on thoracic segments = Perlidae

  13. Perlodidae • Small fingerlike gills on thorax or none • Distinct pigmentation on head and thorax • Cerci as long as abdomen

  14. Chloroperlidae • Thoracic wing pads parallel; cerci <3/4 length of abdomen, thorax and head usually without pattern

  15. Capniidae • Abdomen divided by membraneous fold along its whole length, middle segments of abdomen, when viewed from above, are wider than the base of the terminal segments, body is usually brown in color

  16. Leuctridae • Abdomen divided by membraneous fold along no more than the first  6 segments, sides of abdomen more or less parallel down their length, usually pale in colour

  17. Nemouridae: tarsal segment 2 shorter than 1Taenioptergidae: tarsal segment 2 = to 1

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