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Intertidal Zone
 The zone between the highest and lowest tides along
marine shores.
 Located along coast lines all around the world
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Types of Intertidal Zones
 Sand Beaches
 Rocks
 Estuaries
 Mangrove
 Coral Reefs
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Three Zones Within…
 Supra-Littoral Zone
 covered by water during
the highest high tides
 arid conditions
 Mid-Littoral Zone
 Increased submergence
time

Home to many mussels

Pisaster ochraceous.
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 Low-Littoral Zone
 normally covered by
water.
 high concentration of
nutrients

Home to many organisms
Organisms Adapt to Changes…
 Moisture
 Covered at high tide,
exposed to air at low
tide.
 Water Movement
 rough waves can
dislodge or carry away
poorly-adapted
organisms (Barnacles)
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 Temperature
 range from moderate
water temperature to
moderate/scorching or
freezing air temps.
 Salinity
 Tide pools can become
diluted or very salty
Flora
 Sea Grass
 Seaweed
 Green Algae
 Dead Mans Finger
 Brown Algae
 Common Rockweed
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Fauna
 Crabs
 Starfish
 Atlantic Horseshoe Crab
 Shiny Red Tunicate
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Threats
 Invasive Species
 Caulerpa taxifolia

Algae from Caribbean in
Massachusetts
 Pollution
 Trash
 Oil spills
 Sewage spills
 Toxic chemical runoff
 Global Climate Change
 Rise in ocean temperature
Harvesting animals/plants
 Humans

(aquariums: seaweeds)
 Shell collecting
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
Shift of distribution
References

SeaWorld &Busch Gardens. "TIDE POOLS - Human Impact & Conservation."SeaWorld/Busch Gardens ANIMALS - HOME.
SeaWorld & Busch Gardens. Web. 26 Oct. 2011. http://www.seaworld.org/wild-world/ecosystems/info-books/tide-pools/humanimpact.htm

"OceanLink | Biodiversity - the Intertidal." OceanLink | Marine Sciences Education and Fun. OceanLink. Web. 26 Oct. 2011.
<http://www.oceanlink.info/biodiversity/intertidal/intertidal.html>.

"Shores - NatureWorks." New Hampshire Public Television - Engage. Connect. Celebrate. Nature Works. Web. 26 Oct. 2011.
<http://www.nhptv.org/natureworks/nwep6b.htm>.

"Marine Ecosystems - Zonation Features on Seashore." Www.tonya.me.uk Tonya Homesite It Trainer and Student Marine Biology
Oceanography Bangor Ocean Sciences. Tonya Marine Biology/Oceanography. Web. 26 Oct. 2011.
<http://www.tonya.me.uk/Marine/tidalzones.asp>.
Kathleen Fox