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Coral Bleaching and the Affect of Temperature Change on Coral Reef PredatorPrey Interactions

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Coral Bleaching and the Affect of. Temperature Change on Coral Reef. Predator-Prey Interactions ... theStructure of Coral-Reef Fish Assemblages'. Ecological ... – PowerPoint PPT presentation

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Title: Coral Bleaching and the Affect of Temperature Change on Coral Reef PredatorPrey Interactions


1
Coral Bleaching and the Affect of Temperature
Change on Coral Reef Predator-Prey Interactions
  • Juliann Krupa

2
Coral Bleaching
  • Color in coral comes from the photosynthetic
    symbiotic algae that live with in the tissue of
    the coral
  • When the sea surface temperature is raised above
    optimal levels, algae die and are expelled and
    coral dies soon after
  • The optimal temperature for corals is a small
    range (24-29C) and each coral species has a
    specific bleaching threshold

3
(No Transcript)
4
Coral Predators
Damsel Fish
Parrotfish
Crown of Thorns Sea Star
5
Lokta-Volterra Predator-Prey Model
Modified to include another parameter ?t,
degrees that SST is above bleaching threshold
level
C(t) population (size) of coral P(t)population
of parrotfish agrowth rate of coral cdeath rate
of parrotfish b d constant of interaction
between coral and fish
6
Lokta-Volterra Model
  • Assumptions
  • Interaction limited to between coral and
    parrotfish
  • Without coral, parrotfish populations
    proportionally decline
  • At its optimal temperature, coral grows at a
    steady rate
  • Temperature proportionally affects coral growth
  • Temperature proportionally affects parrotfish
    population

7
?t0
8
?t1
?t.5
?t1.5
?t2
9
Sources
  • Brown, B. E. Coral Bleaching Causes and
    Consequences. Coral Reefs. Springer Berlin,
    Heidelberg. Vol. 16. June, 1997.
  • Glynn, P.W. Coral reef bleaching ecological
    perspectives. Coral Reefs. Springer Berlin,
    Heidelberg. Vol. 12. March, 1993.
  • Hixen, Mark. Predation, Prey Refuges and
    theStructure of Coral-Reef Fish Assemblages.
    Ecological Monographs. Vol. 63. 1993.
    lthttp//www.jstor.org/view/00129615/di960508/96p00
    374/0gt
  • Hoegh-Guldberg, Ove. Curbing Coral Crisis.
    University of Queensland, Office of Research and
    Post Graduate Studies. Sept 2006.
    lthttp//www.uq.edu.au/research/index.html?page517
    83pid0gt
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