zonation in the ocean powerpoint
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Zonation in the Ocean
The ocean can be divided into zones.
neritic zone• shallow water over the continental
shelf• lots of light
oceanic zone• water over the deep sea• light only at the surface
ocean light zones
photic zone
• sunlit, upper layers of ocean• made up of euphotic and disphotic zones
ocean light zones
euphotic zone
• sunlit, upper layers of ocean• upper 150 m – depending on where you are• phytoplankton can survive and
photosynthesize here
ocean light zones
disphotic zone
• twilight zone• enough light to see, but not enough for
photosynthesis• extends to a few hundred meters deep
ocean light zones
aphotic zone
• permanently dark• no sunlight• no photosynthesis• most of ocean• extends to sea floor
vertical zonation of the ocean depends on depth
The Epipelagic Zone
The Mesopelagic Zone
The Bathypelagic Zone
The Abyssopelagic Zone
The Hadal or Hadopelagic Zone