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Published byGerard Caldwell Modified over 8 years ago
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Plecoptera Typically clean, cool, running water - rocks, boulders
Few in lakes Sensitive indicator taxa
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Adults Riparian vegetation, or on rocks and debris along stream
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Larvae Typically switch food type with development:
Usually herbivore-detritivore - switch to omnivore-carnivore Shredders Predators
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Emergence Through year Predators - emerge spring-summer
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Adult behavior Males and females drum to communicate
Tap substrate with tip of abdomen
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Drumming Females release eggs over stream surface
Eggs stick to surfaces
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Life history Univoltine = annual life cycle
Few are semivoltine = 2-3 generations / year Hemimetabolous metamorphosis = incomplete metamorphosis No pupal stage
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Morphology Gills in some Cerci - usually 2 Wingpads
2 claws at end of each leg
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Be able to ID to family Gills, mouth parts
Pteronarcyidae - finely branched gills on thorax and first 2 abdomen segments
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Pteronarcyidae
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No gills on abdomen Finely branched gills on thoracic segments = Perlidae
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Perlodidae Small fingerlike gills on thorax or none
Distinct pigmentation on head and thorax Cerci as long as abdomen
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Chloroperlidae Thoracic wing pads parallel; cerci <3/4 length of abdomen, thorax and head usually without pattern
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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
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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
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Nemouridae: tarsal segment 2 shorter than 1 Taenioptergidae: tarsal segment 2 = to 1
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