Corals and hydroids
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Corals and Hydroids. Chapter 7.3 and 7.4. Coral Reefs. Very large structures made from very tiny animals (some are microscopic). Reefs are named after familiar objects whose shape they resemble: Hard corals include: elk horn coral, staghorn coral, brain corals

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Corals and Hydroids

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Corals and hydroids

Corals and Hydroids

Chapter

7.3 and 7.4


Coral reefs

Coral Reefs

  • Very large structures made from very tiny animals (some are microscopic).

  • Reefs are named after familiar objects whose shape they resemble:

    • Hard corals include: elk horn coral, staghorn coral, brain corals

    • Soft corals include: fan coral, sea whip coral, sea plume coral and sea rod coral


Elk horn coral

Elk Horn Coral


Stag horn coral

Stag Horn Coral


Brain coral

Brain Coral


Fan coral

Fan Coral


Sea whip coral

Sea Whip Coral


Sea plume coral

Sea Plume Coral


Sea rod coral

Sea Rod Coral


Coral polyp

Coral Polyp

  • Life activities like ingestion, digestion, sensitivity, exchange of gases, and reproduction are similar to anemones

  • Coral polyps are colonial and connected by a membrane (colonial stomach) that allows them to share food


Structure of the polyp

Structure of the Polyp

  • Tiny mound of tissue that sits in a cup-shaped depression that forms in the surface of the reef.

  • Adds layer after layer of limestone to the reef year after year which adds to the coral reef


Symbiosis

Symbiosis

  • Polyp needs tons of energy to build the reef, so it relies on a symbiotic relationship with an algae called zooxanthellae.

  • Polyp feeds with tentacles and take energy from the algae while giving it a place to live


Coral reef

Coral Reef

  • The reef is made of limestone (CaCO3). The polyps get the ingredients for limestone from the seawater.

  • Live in tropical water. Needs water to be clear for photosynthesis.


Hydroids

Hydroids

  • Class Hydrozoa

  • Also colonial and look plantlike

  • Different members of the colony perform different functions:

    • Feeding polyp, reproductive polyp, floatation polyp, etc.


Hydroid members

Hydroid Members

Portuguese Man O’War

Obelia


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