Coral–algae symbiosis connects physiology with environmental conditions. This schematic shows the direction of a biological relationship and its disruption, while omitting species-specific thresholds, nutrition and local water quality. Apply the distinction between a stress response and death to a new observation before deciding what further evidence is needed.
Water and oceans · Discover & try
Can a bleached coral still be alive?
Reading level 5 of 5 · AdvancedChange
Word help
Symbiosis
A close biological relationship between different organisms.
Bleaching
Loss of symbiotic algae or their pigments from coral tissue.
Mortality
Death, which is not identical to bleaching.
Watch · Try · Explain
See how it works
The interactive activity is loading.
Conceptual partnership and stress sequence; stage timing and recovery are not predictions for a real reef.
What to look for
- Distinguish algae loss from tissue death.
- Compare persistent stress with relief.
- Notice that progress is not a count of days.
Explain what you noticed
A different reef survey sees pale coral tissue but has not checked whether it is living. Which conclusion is justified?
Keep this idea: Bleaching is loss of symbiotic algae or their pigments; a bleached coral is vulnerable but not necessarily dead.
Follow the sources
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
Keep following the idea
Next discovery →