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Life in Tidal Zones
Transcript of Life in Tidal Zones
in Intertidal Zones
The tidal zones are the areas between the high and low tides. It has four sections - the spray zone, the high tide zone, the middle tide zone and the low tide zone.
Spray Z NE
The Spray Zone is always above water, except when there are very high tides. Animals that live here include lichen, periwinkle snails, lice, barnacles, and isopods. The Spray Zone is the least
from the four zones. It is also known as the Upper Littoral Zone, the Barnacle Belt, and the Splash Zone. Since
that live here are usually exposed, they will have to cope with the change of air temperature, unlike the
that live in
areas - like the Low Tide Zone. That is why it gets more and more diverse as the zones get farther into the ocean.
High Tide Zone
The High Tide Zone is flooded with salt water only when there are high tides. It's more diverse than the Spray Zone, but less
than the Middle Tide Zone and the Low Tide Zone. Crabs, sea stars, anemones, and more live here. It is also known as the Upper Mid-littoral Zone, as well as the High Intertidal Zone.
Middle Tide Zone
Low Tide Z ne
The Low Tide Zone is always
, except when there are extremely low tides. This is the most
zone, because the
that live here are not exposed to the air, which can be freezing cold or scorching hot. Because of this, they are not used to long periods of dryness - instead, they are used to heavy waves washing over them.
that live here are brown seaweed, sponges, shrimp, and whelks, The Low Tide Zone is also known as the Lower Littoral Zone.
More space and food for everyone
The shallow water let's plants at the bottom of the ocean have sunlight.
The movement of waves supply nutrients and oxygen
that live in intertidal zones must be able to
to changes in:
They must be used to dry and wet living
, as well as the temperature of the water (and the temperature of the air, when exposed.) Sometimes, the tides create tide pools, and these have less salt than the ocean - so some fish must be able to adapt to both salty and
Also, they must know to protect themselves from rough waves - some intertidal animals live under rocks/attach themselves to one to stay rooted.
rich in many differences
under the surface of water
the act or capacity of enduring
or diffused liquid especially water
reduced in volume, area, length, or scope
of, containing, or resembling common table salt; salty or salt like
a restricting, limiting, or modifying circumstance
to adjust to a new environment
to water down; have more solvent than solute
What would happen
if we changed something
in the ecosystem?
goes extinct, one that everyone in the
Intertidal Zones relies on
(for example, algae), no one
and they will die. This would also affect
If an important species
seals and fish, who pray on Intertidal
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The Middle Tide Zone (also called the Lower Mid-littoral Zone) is usually underwater, except for the times when there are low tides. The organisms in this area are more used to water than air, so though their
of air is lower than the organisms in the Spray Zone and the High Tide Zone, they are used to very big waves. Sea Urchins, mussels and snails are some of the creatures that live here. More organisms live here than the previous two zones - this is because the organisms here are protected by the water and do not have to be exposed to the air as much.
Change in temperature
Must have shelter/foundation or else the
that live there will be swept away by the tide.
Exposed to predators when waves are out
will have food
What do organisms in the Intertidal
Zones eat? Who are the predators and
who are the prey?
Filter feeders, such as mussels and barnacles, eat plankton.
Limpets and Kelp Crabs eat autotrophs, such as sea-
weed and algae. They are called Grazers.
Predatory Consumers, like starfish, eat both filter feeders
Crabs (a scavenger) eats all dead organic material,
both producers and consumers.
Thank you for watching!
high tide zone
middle tide zone
low tide zone