MB coral reefs

What forms a coral reef?

colonies of coral polyps

What phylum do coral polyps belong to?

Cnidaria

How many marine species do coral reefs provide habitat for?

25%

Which describes hermatypic corals?

They are reef building corals

What are zooxanthellae?

Algae living in symbiosis with corals

Select the true statements

- Polyps provide protection for zooxanthellae
- Many corals can do photosynthesis without zooxanthellae
- Zooxanthellae have lost their flagella
- Zooxanthellae are autotrophs
- Zooxanthellae are only found in ahermatypic corals

Polyps provide protection for zooxanthellae
Zooxanthellae have lost their flagella and are autotrophs

What is a fringing reef?

A coral reef that grows directly off the coast, forming a border. Separated from the shore by a
shallow lagoon channel.

What is a barrier reef?

A coral reef that grows further off the coast, forming a barrier. Separated from the shore by a
deep wide lagoon.

What is an atoll?

A circular type of coral reef with a large lagoon in the middle.

The deep water corals in Norway contain zooxanthellae.

False

How is long distance dispersal of corals mainly facilitated?

Through Sexual reproduction, with a planktonic larval stage

What type of sexual reproduction is typical for corals?

Broadcast spawning

What causes "black band disease"?

A cyanobacterium

What happens during coral bleaching?

The zooxanthellae are ejected from the corals.