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Water, Water, Everywhere and Nary a Drop to Drink

Water Availability. Organisms can gain or lose waterPartly determined by concentration gradientWater moves down the gradient. Water Content of Air. Relative Humidity - quantity of water vapor in air RH = Water vapor densityX 100 Saturation water vapor density Water vapor pressure - pressure exerted by water vapor in airVapor pressure deficit - the relative saturation of air with water.

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Water, Water, Everywhere and Nary a Drop to Drink

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    1. Water, Water, Everywhere and Nary a Drop to Drink The Rime of the Ancient Mariner Coleridge, 1797

    2. Water Availability Organisms can gain or lose water Partly determined by concentration gradient Water moves down the gradient

    3. Water Content of Air Relative Humidity - quantity of water vapor in air RH = Water vapor density X 100 Saturation water vapor density Water vapor pressure - pressure exerted by water vapor in air Vapor pressure deficit - the relative saturation of air with water

    4. Determining the Gradient Terrestrial animals - vapor pressure deficit Aquatic animals - relative osmolarity Terrestrial plants - water potential

    5. Terrestrial Animals -VPD

    7. Terrestrial Plants - Water Potential Plants gain and lose water Moves along gradient of water potential from high to low Will go from plant --> air due to vpd Need it to go Soil -- Plant -- Air

    9. Water Movement in Aquatic Environments Diffusion - move down concentration gradients Osmosis - diffusion of water across a semipermeable membrane

    10. Aquatic Animals - Osmolarity Water still moves down gradient ? solutes in water = ? osmolarity Water goes low osmolarity to high Isosmotic - no change Hypoosmotic - lose water Hyperosmotic - gain water

    11. Aquatic Animals

    12. Freshwater vs. Marine Bony Fish

    13. Marine Cartilagenous Fish Same problems as marine teleosts Barely hyperosmotic urine

    15. Water Regulation on Land

    16. Water Acquisition by a Desert Beetle

    17. Water Acquisition

    18. Water Conservation Lower evaporation

    19. Water Conservation Increase gain

    20. Water Conservation Alter secretions

    21. Uric Acid

    22. Terrestrial Plants

    23. Water Conservation ? Evaporation

    24. Water Conservation Increase absorption

    25. Water Conservation Less leaf area per length of root Drop leaves in response to drought Produce leaves in response to soaking rain the shed them when desert dies out.

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