This presentation involves about the difference between estuaries and intertidal zones.

1. What are the
Biotic and Abiotic
Conditions in
Intertidal Zones
and Estuaries?

2. The intertidal zone
It is the portion of the shore
above the low tide mark and
below the high tide mark.
In places, where the water
near the shore is deep, the
rocky headlands prevent us
from enjoying a wide
intertidal zone.

3. The intertidal zone is the area between the
highest tide and lowest tide marks. This habitat
is covered with water at high tide, and exposed
to air at low tide. The land in this zone can be
rocky, sandy or covered in mudflats.
The intertidal zone is the
area between the highest tide
and lowest tide marks. This
habitat is covered with water
at high tide, and exposed to
air at low tide. The land in
this zone can be rocky, sandy
or covered in mudflats.

6. Sea stars, brittle star, small
crabs, small fish and others
are found in shallow pools.
Sea urchins occupy even the
crevices living the bigger
pools.
Near the edge of the low
tide, shellfish and other
organisms are seen clinging to
the wet rocks.

7. On sandy beaches, the
intertidal zone is kept alive by
tiny fiddler crabs rapidly
running from hole to hole in
the sand.
Near the edge of the water,
small bivalves lie buried in the
sand where people in the area
harvest them by first digging a
hole in the sand.

12. The inhabitants of the intertidal
zone have been described as the
“most versatile” aquatic creatures.
Versatile means variable, or changing
rapidly.
It is said to be versatile because half
of the time, they are submerged in
water, and half of the time, they are
exposed to strong wind and the
scorching heat of the sun, throughout
their life.

13. The outflowing river water is
often ,loaded with soil particles
from the land.
The nearby intertidal zone
often becomes covered with
silt.
Such an area is ideal for the
formation of mangrove swamps
on the either side of the river.

14. Estuary
 Refers to the area where
outflowing river water meets
seawater.
 Salinity refers to the salt
content of the water.
 The salt content of the water
in an estuary is lower than
that or normal seawater
because the seawater is dilute
by freshwater from the land.

18. Thank you for listening!!!