millrace macroinvertebrates - university of oregon...native to willamette valley, found in millrace...
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Millrace Macroinvertebrates
Joanna Lyle2017
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Is the millrace polluted?
● What kind of environment should we expect to find in a slough?
● Criteria for evaluation changes based on type of aquatic environment
● Aesthetic value
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How do we monitor water quality?
● Chemistry (dissolved O2, pH, heavy metals, etc.)
● Physical properties (temperature, turbidity, stream bed composition)
● Biological (species richness, diversity, ecology)
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Sensitive species
Mayfly (Ephemeroptera) Caddisfly (Trichoptera) Stonefly (Plecoptera)
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Sampling sites
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Millrace pondvs.
River pond
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Method
● Net technique - disturb bottom of pond
● Use sieves to sort and remove debris
● Wash into tray; wait for movement
● Catch and count
http://www.forestry-suppliers.com/Images/Original/3168_53716_p1.jpg
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Caddisfly or stick?
Pea clam (Sphaeriidae)
Snail (Gastropoda) Scud (Amphipoda)Red midge (Diptera)Mayfly (Ephemeroptera)
Case-making caddisfly (Trichoptera) http://www.nwnature.net/macros/lena_jul06/images/IMG_0651.jpg
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Threespine stickleback (Gasterosteus aculeatus);Native to Willamette valley, found in millrace pond
Western mosquitofish (Gambusia affinis); non-native fish, found in river pond
“Field Guide to the Common Fish of the Willamette Valley Floodplain ”https://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/50100/em9091.pdf
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How do the millrace and river ponds compare?
● Millrace has higher richness, but fewer sensitive species
● Both mostly have pollution-tolerant species
● Neither would be good habitats for salmon
○ Good places for other species: herons, ducks, geese, etc.
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Limitations and future directions
● Good to study other nearby, undisturbed ponds like at Mt. Pisgah
● Change over time (transition between spring & summer may affect the composition of invertebrates
● Checking different places along millrace● Identify to family or genus
Mystery snail