Bivalves



cl..jpgoy.jpgoysters.jpg

A. Organized Body Made of One or More Cells - Brian I.

Bivalves have a compressed body with two shells and a hinged area. It uses gills to breathe and to sort food.

B. Obtain and Use Energy - Dhanya B.

Bivalves are filter feeders. Food particles and water are drawn into the incurrent siphon, a pipe or tube to convey liquid. It travels down to the gills where a hair-like structure called cilia moves the food and water. As the food moves, it gets caught in mucus on the gills. Then, oxygen is obtained from the water and nutrients are taken from the food. Afterwards, the food and mucus mixture is transported to the palps, where the food is pushed down to the bivalve's mouth. Later on, it's all discharged through the excurrent siphon. Once they obtain their energy, they use all of it in repositioning or moving.

(Picture below: A diagram that shows all the parts of the bivalve digestion cycle.)

33-21-ClamAnatomy-L[1].jpg

C. Reproduce-Emily P.

Male and female sexes do not exist in the bivalve's world. One bivalve contains both male and female sex organs, They can produce their own eggs, but that is a matter of survival. If the same type of organism is around them, one releases its sperm, as another discharges its eggs into the water, and fertilization is external.

whats_up.gif
Bivalves reproduction system


D.Grow and Develop-Brian I.

mussellife.jpglife cycle of the clam

My organism starts off by attaching itself to a host the as trochophore. a planctonic larva like creature. It then grows into a veliger, a more mature form of larva. After that they become adults and release eggs and sperm, and the cycle goes on.


E. Respond to Stimuli-Dhanya B.
clams3[1].jpg
Clams moving back into the sea.

Moving is very hard for bivalves. They have to open and close their valves rapidly trying to make currents so they can move. Although they seem like boring animals, they have very different senses. Bivalves can detect danger from shadows that fall on them. When they do, bivalves close up their shells and play dead. If there is a cloudy area near them, they can feel it. Bivalves are very sensitive to touch. With all these unique senses, bivalves are protected from predators.

(The picture on the right shows clams trying to move back into the sea.)

(The link below is an example of how a clam responds to dry land.)

http://www.youtube.com/watch?v=48_MU9NH2rc&NR=1&feature=endscreen

F. Exchange Gases with the Environment - Emily P.

All bivalves are sea creatures, meaning they have gills. They take in dissolved oxygen from the water, and filter it through their gills, and put out as carbon dioxide back into the water.


yo_yo_yo.jpg
In down right corner:Is a picture of bivalves respiratory system



Resources:

1. Castro,Huber. Marine Biology. Boston,Massachusetts: WCB McGraw-Hill, 1997

2. National Geographic Society; Biggs, Alton, et al. Life Science. New York: Glencoe McGraw-Hill, 2002

3. Tate,Suzanne. Skippy Scallop. Manteo,North Carolina: Nags Head Art,Inc., 2003

4."Bivalve Anatomy." The Assateague Naturalist. 2010 <http://www.assateague.com/index.html>.