Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

17
Features of a Coral Polyp Grade 3 Unit 3 Lesson 2

Transcript of Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Page 1: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Features of a Coral PolypGrade 3 Unit 3 Lesson 2

Page 2: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Corals belong to the phylum Cnidaria

Medusa or polyp body forms as adults

Stinging cells called nematocysts

Only one body cavity with a single opening

Page 3: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Reef coral is made of many small individual animals called polyps.

Page 4: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

What’s a polyp?

• The basic body form of a coral animal

• Structure like a sac with two walls of cells

• The open end bears the mouth, which is surrounded by tentacles

mouth/anustentacle

body stalk

epidermis

mesoglea

gastrodermisgastrovascular

cavity

Page 5: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Coral as PredatorsCoral must eat - it’s a consumer!

Nematocysts are used to sting, catch, and kill prey

Page 6: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Stinging cells also protect

Page 7: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Coral Reproduction:

Budding

Page 8: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Coral Reproduction:

Broadcast Spawning

Page 9: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Is it a plant?

• Polyps have symbiotic algae, called zooxanthellae living in their cells

• Zooxanthellae make food for the polyp through photosynthesis

It has a plant living inside it!

Page 10: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Symbiosis:coral & zooxanthellae

• symbiosis: a close relationship between two organisms usually based on food

• If the zooxanthellae feeds the coral, what does the zooxanthellae get out of the relationship?

Page 11: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Is it a rock?It’s a type of rock!

Coral polyps make a stony structure out of calcium carbonate in which they live

Page 12: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Common Hawaiian Coral

Rice Coral

Antler Coral

Cauliflower Coral

Lobe Coral

1

Finger coral

Page 13: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

More Hawaiian Coral

Mushroom Coral

Black Coral

Table Coral

Page 14: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Coral is in dangerOcean water is getting warmer

When water gets too warm, zooxanthellae leave the coral tissue

When zooxanthellae leave, corals lose their color AND food supply

CoralBleachin

g

Page 15: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Coral is in danger:Human Impacts on Coral

• Pollution

• Tourism

• Aquarium/Souvenir Trade

• Overfishing

Page 16: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

Hawaiian coral needs your protection

• It has no voice• Speak up to educate others about our beautiful coral

Page 17: Features of a Coral Polyp Grade 3 Unit 3 Lesson 2.

The End