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Light and Sound in the Ocean

Light and Sound in the Ocean. Light Zones of Light Penetration Euphotic Zone (0-200 m)- enough light for photosynthesis Dysphotic zone (200-1000m)- “twilight zone”; diminishing light; no photosynthesis Aphotic Zone (>1000m)- no light.

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Light and Sound in the Ocean

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  1. Light and Sound in the Ocean • Light • Zones of Light Penetration • Euphotic Zone (0-200 m)- enough light for photosynthesis • Dysphotic zone (200-1000m)- “twilight zone”; diminishing light; no photosynthesis • Aphotic Zone (>1000m)- no light

  2. Attenuation- the decrease in the intensity of light over distance (depth in the ocean) • As light pass through water it is absorbed and scattered by water molecules and suspended particles • Light colors with shorter wavelength and more energy penetrate deeper

  3. Bioluminescence- light produced by living organisms • Produced by chem. Reaction that gives off light energy • [A] + [B]  [Products] + light • Luminol + H2O2  3- aminophthalate + light • Strategies for producing light • Hiding • Attracting mate • Attracting prey • Escaping predators

  4. Sound • Sound travels farther and faster in water • 1,500 m/s in water; 334 m/s in air • High-frequency sounds do not travel as far as lo-frequency sounds • Echolocation- use of sound by some animals to locate objects in water

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