macro in water student edition
TRANSCRIPT
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What Lives in Our Water?
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Fish
Minnow
Bluegill
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Amphibians
Leopard Frog
Tadpole
Bull Frog and Green Grog
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Amphibians
– retains gills throughout life
– loses its gills to live on land
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Reptiles
Newly hatched Snapping turtle
Red-eared slider
Adult Snapper
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Reptiles
– common in our area - non-venomous
aggressive but non-venomous
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None of the previous animals are used to indicate the quality of water in an area – they are nice to find, but are often the first to go if the water is not good.
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Indicators of Water Quality
Macroinvertebrates – without backbones, large enough to be seen
Many of the macroinvertebrates are insect larvae that spend part of their life cycle as aquatic organisms (note the gills on the pictures)
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The macroinvertebrates are divided into groups based on their tolerance of poor water conditions.
Group 1 – indicators of good water quality. These have low tolerance of pollutants.
Group 2 – indicators of fair water quality. These have moderate tolerance of pollutants.
Group 3 – indicators of poor water quality. These have high tolerance of pollutants.
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1Food for many fish
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1Food for many fish
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Food for many fish – good bait too!
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1Found in little cases of sand and sticks on the bottom of rocks.
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1Found on the bottom of rocks.
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Riffle Beetle adults
1These are not the water striders that might also be found.
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2Adults hold wings together when resting.
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Larvae are voracious predators – often catching fish and tadpoles!
Adults hold wings parallel when resting.
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Crane Fly larvae
Crane Fly adult
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Might also find horsefly larvae – similar but larger!
These are not giant mosquitoes! They are harmless and lousy flyers.
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Beetle larvae
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2Crustacean – shell on the outside.
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2Crustacean – shell on the outside. Look like tiny shrimp
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2Crustacean – related to the “roly-pollies” found under rocks on land.
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3Segmented worms – only some are blood suckers. Good bait too!
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3This insect larva lives in the silt and is often called a “blood worm” due to its red color.
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3This insect larva has a suction cup on one end to ancor it to rocks.
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– have gills and need water with higher oxygen levels
– have lungs and breathe air - can live in polluted water