Exam 1 - Coral Reefs Flashcards Preview

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Flashcards in Exam 1 - Coral Reefs Deck (11):
1

What is zooxanthellae?

algae that lives symbiotically in the gastrodermis of corals and provides nutrients for the coral through photosynthesis, makes it possible for corals to grow and reproduce.

2

Where are coral reefs found?

in tropical waters between 30 deg N and 30 deg S.

3

What is the coral reef environment like?

bright sunlight, limited turbidity, warm water, normal-hypersaline water, moderate wave action and surface currents.

4

Where will a coral reef be unable to develop?

where there is a strong influx of sediment or fresh water.

5

What is the structure of coral reefs?

built on bedrock platforms, rigid masses of CaCO3, build upward, normally within 2-10 m of ocean surface, mound/ridge/ring shaped, fragile coral grows in reef interior.

6

What did Charles Darwin discover about reefs?

studied Pacific and Indian Ocean reefs, discovered the 3 basic types and how each type evolved.

7

Fringing reef

forms along shoreline of most new tropical islands, produces sexually with planktonic larvae, needs to attach to a solid surface.

8

Barrier reef

forms as an island begins to sink, upward growth creates a lagoon between top of reef and sinking island, lagoon is a haven for protection from waves and storms.

9

Atoll reef

island sinks below surface and reef continues to grow upward, usually oval with some breaks, eroded reef material creates a cay.

10

What is a cay?

an island formed from eroded reef material from atoll reefs and is either stable enough for buildings or moves around a lot and is unstable.

11

What is the ecology of coral reefs?

colonial corals, symbiotic algae, snails and clams, echinoderms, fish, bacteria, and other early decomposers.