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Ocean Zones

Ocean Zones. Neritic Zone. The Neritic Zone includes: Supratidal Zone Intertidal Zone Subtidal Zone. Neritic Zone. Supratidal zone: Harsh conditions D ry , only stenohaline (organisms that need low salinity) organisms can live here

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Ocean Zones

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  1. Ocean Zones

  2. Neritic Zone • The Neritic Zone includes: • Supratidal Zone • Intertidal Zone • Subtidal Zone

  3. Neritic Zone • Supratidal zone: • Harsh conditions • Dry, only stenohaline (organisms that need low salinity) organisms can live here • Air temperature determines zone temperature (not water) • Water splashes from waves or wind sprays • One organism adaptation is to burrow • Above the high tide line • Salt grass, snakes, mice, ghost crabs

  4. Neritic Zone • Intertidal Zone: • Area of great change • Waves spill over/breakers • Area of great adaptations for living with or without water • Tidal patterns determine temperature • Euphotic (light can go through the water) • Sessile (attached) benthic (bottom) organisms • Burrowing organisms • Adaptations to prevent drying out-close up/burrow • Adaptations to cling to rocks • Between the low tide line and the high tide line • Green algae, barnacles, tube worms

  5. Neritic Zone • Subtidal Zone: • Always covered with water • Complete waves • High productivity (lots of biomass produced) • Lots of nutrients • Euphotic ( light goes through water) • Warm • Sessile (attached) and vagrant (move) benthic (bottom) organisms • Nektonic (free swimming) and planktonic (drifters) organisms • Lots of oil drilling here • Between the low tide line and the edge of the continental shelf • Sailfish, dolphins, sea turtles, kelp

  6. Oceanic Zone • Ocean Zone includes 4 smaller zones • These zones are determined by availability of light • Epipelagic Zone (The sunlight zone) • Mesopelagic Zone (The twilight zone) • Bathypelagic Zone (The midnight zone) • Abyssopelagic Zone (The Abyss zone)

  7. Oceanic Zone • Epiupelagic Zone (The sunlight zone) • Euphotic • Warm • Fewer nutrients • Nektonic (free swimming) and planktonic (drifters) organisms • Complete waves • Extends from the continental shelf • Detritus (organic material) falls below like snow • Lower productivity (production of biomass) • Sharks, whales, Sargassum seaweed

  8. Oceanic Zone • Mesopelagic Zone (The twilight zone) • Fading light/twilight/disphotic • Temperature drops rapidly/permanent thermocline • Pressure increases • Nektonic and zooplankton • Less photosynthesis/ respiration continues • Detritus (organic material)/marine snow • Low productivity (production of biomass) • Zooplankton, squid

  9. Oceanic Zone • Bathypelagic Zone (The midnight zone) • Completely dark/aphotic • Isothermal (same temperature throughout)/cold • Pressure great • Organisms adapted to pressure and no light • Nektonic • Detritus (organic material)/marine snow • Low productivity (production of biomass) • Angler fish

  10. Oceanic Zone • Ayssopelagic Zone (The abyss zone) • Completely dark/aphotic • Isothermal (same temperature throughout)/cold • Pressure greatest • Geothermal vents providing for chemosythetic production of biomass • Higher productivity (production of biomass) • Marine debris (snow) accumulates • Special adaptations of organisms • Vagrant (move) benthic, nektonic,bacteria • Giant tube worms, blind crabs, chemosynthetic bacteria

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