Stream organisms require access to food refuge from predators tolerable temperatures
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Transcript of Stream organisms require access to food refuge from predators tolerable temperatures
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Biological AssessmentDeveloped by Ken Cooke
Kentucky Division of WaterWatershed Watch Program Coordinator
Modified by Mike KempProfessor of Environmental Engineering Technology
Murray State University
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Stream organisms require– access to food– refuge from predators– tolerable temperatures– sufficient oxygen– tolerable chemical
conditions
A degraded habitat may not support some organisms.
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Benthic Macroinvertebrates• Benthic – bottom of the stream; macro – visible with
the naked eye; invertebrate – no backbone• Ubiquitous and easy to collect• Relatively sedentary• Vary in sensitivity to habitat alteration and pollution
Good Mid Range Poor
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A diverse community representing a range of tolerances
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A less diverse community dominated by tolerant species
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True or False. The presence of pollution tolerant species such as leeches is an indication of poor water quality.
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True or False. The presence of pollution tolerant species such as leeches is an indication of poor water quality.
False
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Equipment to Bring• Boots, waders, or shoes that can get wet• D-frame or 10-inch aquarium net• Light-colored plastic pan• Field guides, key, and illustrations for identification• Magnifying glass• Biological monitoring assessment datasheet
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Selecting the SiteChoose one or more riffles in your stream reach.
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Sampling Protocol – traveling kick
1/2 meter line
• Set net in riffle.• Kick and stir 1/2 meters above
net.• Rinse net in pan containing a
small amount of water.• Repeat at five different locations
in riffle to produce one composite sample.
• Inspect and remove large debris• Identify organisms and calculate
score.• Carefully rinse net and pan
before sampling another stream.
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Sampling Protocol – low gradient• Estimate habitat present.• “Jab” net in representative
habitat.• Rinse net in pan containing a
small amount of water.• Repeat at ten different locations
in the reach to produce one composite sample.
• Inspect and remove large debris.• Identify organisms and calculate
score.• Carefully rinse net and pan
before sampling another stream.
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For each site, how many kick-net samples should be taken?
What should you do if your reach does not have any riffles?
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For each site, how many kick-net samples should be taken?
What should you do if your reach does not have any riffles?
Five. These can be combined to form one composite sample.
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For each site, how many kick-net samples should be taken?
What should you do if your reach does not have any riffles?
Five. These can be combined to form one composite sample.
Look for other habitats that might support macroinvertebrates. Use the low gradient sampling protocol if necessary.
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Identify the following macroinvertebrates:
A
Images from http://www.cals.ncsu.edu/course/ent525/water/aquatic/index.htm
B C
DB. Newton 2003
E F
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Identify the following macroinvertebrates:
A B C
DB. Newton 2003
E F
caddisfly larva crane fly larva water penny
mayfly larva scud (isopod) damselfly larvae
Images from http://www.cals.ncsu.edu/course/ent525/water/aquatic/index.htm
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