SP217-_Freshwater_aquatic_habitats___Phy

SP217-_Freshwater_aquatic_habitats___Phy - Aquatic...

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1 Aquatic Habitats: Freshwater Types, Descriptions and Terms ISP 217 Dr. Peacor
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2 A California woman who participated in a radio station contest to see who could drink the most water without using the bathroom, died of water intoxication. Jennifer Lea Strange was discovered dead in her home in Sacramento at about 2 pm on January 12th. Water poisoning (i.e. intoxication) is a potentially fatal disturbance in brain functions that results when the normal balance of electrolytes in the body is pushed outside of safe limits by over- consumption of water.
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3 Aquatic Habitats 1. Lakes 2. Ponds 4. Marshes 5. Swamps 6. Sedge Meadows 7. Open Bogs
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6 Aquatic Habitats 1. Lakes 1. Ponds 3. Marshes 4. Swamps 5. Sedge Meadows 6. Open Bogs
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7 Lakes A lake Is: 1. Non-forested 2. Permanent 3. Greater than 10 acres 4. Deeper than 6 feet
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8 Lake/Pond Habitat Zonation littoral zone : near shore where rooted plants can grow. limnetic zone is the surface water layer in offshore areas beyond the littoral zone. photic zone is the lighted and usually well-mixed portion that extends from the lake surface down to where the light level is 1% of that at the surface. aphotic zone is positioned low in the photic zones to bottom of the lake where light levels are too low for photosynthesis . (Recal that respiration occurs at all depths. Therefore the aphotic zone is a region of oxygen consumption.) compensation depth is the depth at which rates of photosynthesis and respiration are equal. benthic zone is the lowest zone. It is the soil layer right below the water.
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9 Lake/Pond Habitat Zonation Limnetic zone Benthic zone
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10 Lakes Vertical Temperature Zones in the open water. 1. Epilimnion (top) 2. Thermocline 3. Hypolimnion In some lakes, trout and salmon prefer the thermocline. Main point: fish and other aquatic life are strongly affected by temperature, so they align themselves with the different vertical zones. When lake has layers, say it is “stratified” Increasing Temp ( º C) Thermocline 16º 24º Surface Bottom Deeper
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12 Spring Lake Temperature Profile Wind mixes water in whole lake very small gradients of chemicals or temperature uniform O 2 profile and temperature profile
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13 Summer Lake Profile
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This note was uploaded on 03/23/2010 for the course ISP 217 taught by Professor Peacor during the Spring '08 term at Michigan State University.

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SP217-_Freshwater_aquatic_habitats___Phy - Aquatic...

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