What does ABH stand for?
ABH stands for Adaptive Bleaching Hypothesis
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(2003) indicates that corals with continuously extended tentacles have denser populations of Zooxanthellae. Coral bleachings are caused by a disruption in these relationships. Symbiotic relationships with corals and other organisms are common in tropical waters with a low abundance of nutrients. These relationships are significantly less common in temperate waters. The Adaptive Bleaching Hypothesis.
Another possible resistance factor is known as the ‘adaptive bleaching hypothesis’; this theory suggests that corals can self select for a specific strain of heat-tolerant zooxanthellae which allow them to be more resistant to ocean warming. The adaptive bleaching hypothesis is still being investigated but if corals can in fact obtain zooxanthellae that are more heat-tolerant, they will be more likely to adapt and survive in the face of climate change.
Kinzie III, R. A. , Takayama, M. , Santos, S. C. and Coffroth, M. A. 2001. The adaptive bleaching hypothesis: Experimental tests of critical assumptions. Biological Bulletin 200: 51-58.
 The corals that form the structure of the great reef ecosystems of tropical seas depend upon a symbiotic relationship with algae-like unicellular flagellate protozoa that are photosynthetic and live within their tissues. Zooxanthellae give coral its coloration, with the specific color depending on the particular clade. Some scientists consider bleaching a poorly-understood type of "stress" related to high irradiance; environmental factors like sediments, harmful chemicals and freshwater; and high or low water temperatures.  This "stress" causes corals to expel their zooxanthellae, which leads to a lighter or completely white appearance, hence the term "bleached".  Bleaching has been attributed to a defense mechanism in corals; this is called the "adaptive bleaching hypothesis.