Date post: | 21-Oct-2014 |
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Education |
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The World’s OceansThe World’s OceansAnd who lives there…
The OceanThe Ocean
• Divided into three zones:
• Sunlight
• Twilight
• Midnight
• Can you guess which one is the darkest?
SUNLIGHT ZONESUNLIGHT ZONE
• Top layer, nearest the surface
• Also called euphotic zone
• Enough light penetrating the water for photosynthesis
• More than 90% of all marine life
lives here
SUNLIGHT ZONESUNLIGHT ZONE
• Goes down about 600 ft.
• Most fish live in this zone– (Stingrays, seals, jellyfish, turtles)
• Plankton live here. – Plankton are drifters…they can’t swim.– Usually microscopic – Beginning of the food chain
PLANKTONPLANKTON
• Examples are:
• Jellyfish
• Young crabs
• Microscopic plants
• Microscopic animals
TWILIGHT ZONETWILIGHT ZONE
• Small amount of light can penetrate water
• No plants
• Only those that have adapted
to little light
• Also known as disphotic zone.
TWILIGHT ZONETWILIGHT ZONE
• Between 600 – 3,000 feet below the surface
• Some squid and fish can use their bodies to make light
• Bioluminescence
TWILIGHT ZONETWILIGHT ZONE
• Some twilight zone dwellers
(like lantern fish)
will swim into the sunlight zone
at night to find food.
MIDNIGHT ZONEMIDNIGHT ZONE
• 90% of the ocean
• Entirely dark—no light
• Temperature is near freezing
• Also called aphotic zone
MIDNIGHT ZONEMIDNIGHT ZONE
• What lives here?
• Some are close to cracks in the Earth's crust
• Cracks give off mineral-rich materials
• Bacteria uses minerals from the cracks for energy
• All other living things in the midnight zone are nourished by these bacteria.
Let’s Tour The DeepLet’s Tour The Deep
• Dive!