Crown-of-thorn Starfish
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Crown-of-thorn Starfish By: Amanda Barmore Acanthaster planci Phylum: Echinodermata Calcitic skeleton Water vascular system Mutable collagenous tissue Pentaradial body organization Class: Asteroidea True starfish Movement with tube feet Predators Distribution Crown of Thorn Starfish

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Crown-of-thorn Starfish

By: Amanda Barmore


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Acanthaster planci

  • Phylum: Echinodermata

    • Calcitic skeleton

    • Water vascular system

    • Mutable collagenous tissue

    • Pentaradial body organization

  • Class: Asteroidea

    • True starfish

    • Movement with tube feet

    • Predators



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Crown of Thorn Starfish

Appearance

- 25-35cm, max 80cm

- 12-19 arms

- multicolored

- GBR: reddish grey with red-tipped

spines


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Behavior

  • Habitat

    • Coral Reefs

  • Movement

    • Tube feet

  • Feeding

    • Digestive enzymes


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Life Cycle

  • Fertilization

    • Embryo develops into

      larvae; feeds on plankton

  • Planktonic stages

    • At the mercy of the ocean

    • Gastrula Bipinnaria  Brachiolaria

    • Primordium – sack like structure


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Life Cycle

  • Settlement

    • Day 2: Juvenile starfish

    • Month 6: about 1 cm and feeding on coral

    • Year 2: 20 cm and sexually mature

    • Year 3-4: Senile, low growth and reproduction


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Outbreaks

  • Natural Hypothesis

    • Agricultural runoff creating algal blooms

  • Man interference

    • Removal of starfish predators


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Outbreaks

  • Type

    • Primary

    • Secondary

  • Duration

    • 1- 4 Years

    • GBR 15 Years




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The Evil

  • Reef Destruction

    • 5-6 km yearly

    • 86% of GBR

  • Humans

    • Poisonous spines



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Containment Problems

  • Gamete production

    • 65 million eggs

  • Larval size

    • Antibodies to track

  • Reef size

    • Needle in a hay stack


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Reef Protectors

  • Red Spotted Trapeze Crab

  • Giant Triton

  • Hawaiian Lined Fireworm

  • Divers





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Divers

  • Cutting

    • Not practiced

  • Injections

    • Copper sulfate

  • Removing

    • Difficult


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Knowledge

  • Imprecise Science

    • 1960’s

  • Willingness

    • Attitude

  • Research

    • GBRMPA




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References

  • Google Images

  • Crown of thorn starfish Q&A, http://www.aims.gov.au/pages/reflib/cot-starfish/pages/cot-000.html

  • www.gbrmpa.gov.au/.../sotr/latest_updates/cots

  • http://www.aims.gov.au/pages/reflib/cot-starfish/pages/cot-f15.html

  • http://en.wikipedia.org/wiki/Crown-of-thorns_starfish

  • Ecological Applications Textbook

  • http://www.divegallery.com/crownofthorns.htm

  • http://www.tellusconsultants.com/Thread/ACANTH.HTM