Nutrition
 
   
 
boulder coral Montastrea scraped by parrotfish
boulder coral Montastrea sp. scraped by parrotfish
 

This is a trick question. The answer is that both corals have been scraped by parrotfishes and neither is bleached. The clue for the Left photograph is the distinctively scraped edges of the polyps. In bleached corals the polyp skeletons remain intact. Note also in the close-view insert that the central portions are still brown in colour, indicating that zooxanthellae are still present in the deeper tissues.

The give-away clue for the Right photograph is the sharp-edged and deeply grooved patches. Note also the repeating pattern of paired marks, as though the same 2-jawed predator has bitten once, then again, and again, and again...

Good thinking if you got this correct.

 
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hot button for parasitism part of Biology of Caribbean Coral Reefs website hot button for mutualism part of Biology of Caribbean Coral Reefs website hot button for commensalism topic in BCCR hot button for symbiosis quizzes section of BCCR hot button for commensalism part of BCCR hot button for symbiosis quizzes part of BCCR hot button for mutualism part of BCCR hot button for parasitism part of BCCR hot button for corals: a case study part of BCCR hot button for photosynthesis part of BCCR hot button for herbivory part of BCCR hot button for carnivory part of BCCR hot button for detritivory/bacterivory part of BCCR hot button for prey-capture section of BCCR hot button for photosynthesis part of BCCR hot button for coral-bleaching part of BCCR hot button for mucus-net feeding part of BCCR