Rapid Evolution in a Coral Population Following a Mass Mortality Event

Area of Science:

• Marine Biology
• Genomics
• Ecology

Background:

• Corals face increasing mass mortality events (MMEs) due to marine heatwaves.
• The roles of genetic variation (host, symbiont) and environment in coral survival and recovery post-MME are not fully understood.

Purpose of the Study:

• To investigate the genetic basis of coral survival and adaptation following a mass mortality event.
• To understand the impact of host genetics and environmental selection on coral population recovery and rapid evolution.

Main Methods:

• High-resolution temporal and spatial whole genome sequencing of coral populations.
• Analysis of genetic variation before, after, and several years following a mass mortality event.

Main Results:

• Host genetics significantly impact coral bleaching resistance and mortality.
• Alleles crucial for adaptation were identified and shown to persist in the next generation, indicating rapid evolution.
• Allele frequency shifts demonstrated habitat specificity, highlighting complex environmental selection patterns.

Conclusions:

• Coral populations exhibit rapid evolutionary adaptation to mass mortality events driven by climate change.
• Host genetic variation plays a key role in coral resilience and recovery.
• Understanding genomic landscape changes is crucial for predicting coral population dynamics under global change.