Clams- Powerpoint

advertisement
• Clams come in many
colors, including shades of
brown, red-brown, yellow
and cream
• They have shells
consisting of two halves
• The halves are connected
at the top
• The abductor muscles on
each side hold the shell
closed
• They have a foot that is
used to dig into the sand
• They have a pair of long
siphons that extrude from
the clams' mantle
• They inhabit the
subtidal regions of
bays and estuaries to
about 15 meters in
depth
• They are generally
found in mud flats
and firm bottom areas
consisting of sand or
shell fragments
• They can live in
saltwater
Home sweet
home
• Clams are filter feeders
that feed on plankton
• Water and food particles
are drawn in through one
siphon to the gills
• Tiny, hair-like cilia move
the water and the food is
caught in the mucus on
the gills
• The food-mucus mixture
is transported along a
groove to the palps that
push it into the clam’s
mouth
• The second siphon
carries the water away
• They usually require both
males and females to
reproduce
• Their eggs and sperm are
released into the water
and then fertilization
takes place
• The eggs hatch into
veligers and they live
among and eat other
plankton
• The veligers settle on
rocks, wood, or the ocean
bottom and start to grow
their valves
• Most clams stay in the
same place for much of
their lives but some are
able to move around
• Burrowers move up and
down through mud and
sand by extending their
foot
• Then they expand the tip of
their foot to anchor
themselves and pull their
shelled bodies up or down
in the burrow
• Others "swim" through the
water by clapping their
valves together
• The largest known bivalve
was a Giant Clam which
weighed 734 pounds and
was four feet in length
• The shells the Giant Clams
were used as children's bath
tubs and for baptismal fonts
in many churches
• It was once thought that the
Giant Clam could trap a
diver underwater by closing
suddenly on his or her foot,
but this could only happen
to a very slow or very
careless diver
• Many animals eat clams,
including eels, sea stars,
whelks, and people
That’s
me!
Download
Related flashcards

Fisheries

25 cards

Islands of Vanuatu

45 cards

Battleship classes

33 cards

Passenger ships

59 cards

Create Flashcards