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Page 1: Oceanic Zones
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Oceanic ZonesSeveral factors used to divide the ocean in to

distinct life marine zones

light availabilitydistance from shorewater depth

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Zones of Light Availabilityphotic (light) zone: upper part of the ocean

where light penetrateseuphotic zone is the topmost part of the

ocean where light is strongestaphotic zone: lower part of the ocean where

very little or no light penetrates

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Photic Zoneeuphotic zone is where nearly all of primary

production from photosynthesis occurshighest concentration of plants

Algae, phytoplankton, and sea grassmost ocean fish live in this zone

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Plants and Animals of Photic Zone

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Aphotic Zoneno living plantshigh pressure, low temperaturesanimals survive by eating detritus or other

animalsanimals must adapt to living with no light

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Zones: Distance from the Shoreintertidal zone: where land an ocean overlapneritic zone: seaward from the low tide line,

the continental shelf out to the shelf breakoceanic zone: beyond the continental shelf

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Life in the Neritic Zonewell oxygenated waterlow water pressurestable temperature and salinity levelshome to photosynthetic life

phytoplanktonsargassum

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Animals and Plants of the Neritic Zone

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Oceanic Zonelarger creatureslife decreases with increasing depthwidest array of life (because it is a very broad

area)

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Animals of the Oceanic Zone

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Water Depthpelagic zone: open ocean of any depthbenthic zone: includes any sea bottom surfaceabyssal zone: subdivision of benthic zone;

deepextremely high water pressurelow temperatures

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Benthic Zonelow oxygenation of waterlow temperaturesanimals here feed on detritus or other

animalslittle or no plant life (depending on depth of

water

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Animals of the Benthic Zone

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Abyssal Zonefloor of deepest parts of oceanmost bizarre animals found hereincredible water pressureabsolutely no lightvery cold temperatureshard to survive

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Animals of the Abyssal Zone


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