marine invertebrates (sponges and rotifers). sponges 1.sponges are multi-cellular, and come in many...

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Marine Invertebrat es (Sponges and Rotifers)

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Page 1: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Marine Invertebrat

es(Sponges and Rotifers)

Page 2: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Sponges1. Sponges are multi-cellular, and come in

many sizes, colors, and shapes.

2. Sponges have few specialized structures, and are found in warmer, tropical waters.

3. Sponges are made up of 2 layers:a) Endoderm- inner layer

b) Ectoderm- outer layer

4. Between the 2 layers is a jelly-like material called mesenchyme.

Page 3: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

5. Sponges belong to the phylum Porifera, which means “pore bearing”.

6. Sponges are considered Benthic organisms, they are bottom dwelling.

Page 4: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Sponge Anatomy

Page 5: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

How do Sponges Feed?

1. Sponges are sessile- they spend their lives attached to an object.

2. Sponges bodies contain many holes.

3. Sponges bodies are elastic.4. All parts of a sponge are the

same.5. They feed by taking in the

plankton and algae found in water through small pores called ostia.

6. Water and wastes exit through a large hole called the osculum.

Page 6: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

7. . Collar CellsCollar Cells line the inside of line the inside of the sponge and have the sponge and have flagella that sweep food into flagella that sweep food into and pump water out of the and pump water out of the sponge.sponge.

8.8. Digestion takes place inside Digestion takes place inside the food vacuoles in each the food vacuoles in each individual cell.individual cell.

9.9. Gases are also exchanged Gases are also exchanged at the cellular level.at the cellular level.

10.10. Sponges have no nervous Sponges have no nervous tissue, they do not respond tissue, they do not respond to touch, and will not move.to touch, and will not move.

Page 7: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

How do Sponges

Reproduce?

1. Sponges can be male, female, or both (hermaphroditic).

2. They can also reproduce asexually by regeneration.

Page 8: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Let’s go to the Video!

QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.

Page 9: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Rotifers1. Rotifer means “wheel bearer”.

2. Rotifers live in the moist sands along the shore, as well as, in freshwater.

3. They belong to the phylum Rotifera.

4. They can change the shape of their bodies and telescope them to make it easier to move their cilia.

5. They are both sessile and motile.

Page 10: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

How do Rotifers Eat?

1. They are predators…they create a current by beating their cilia and take food in.

2. Food passes through a one way digestive tract.

3. Food is digested in the stomach or the intestines.

4. Wastes are eliminated through the anus.

Page 11: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

How do Rotifers Reproduce?

1. Rotifers can be male or female.

2. Males produce sperm in the testes.

3. Females produce eggs in the ovaries.

4. Gametes are released into the water where they fuse.

5. Rotifers fertilize externally.

6. They can also reproduce asexually by a method called parthenogenesis ( a complete egg is produced w/o fertilization and has a complete set of chromosomes).

Page 12: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Rotifers

Page 13: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Let’s go to the Video!

QuickTime™ and aSorenson Video 3 decompressorare needed to see this picture.

Page 14: Marine Invertebrates (Sponges and Rotifers). Sponges 1.Sponges are multi-cellular, and come in many sizes, colors, and shapes. 2.Sponges have few specialized

Blue Tube

http://www.youtube.com/watch?v=T7E1rq7zHLc

http://www.youtube.com/watch?v=KOFF2XNYJGO&feature=related