Phase Shift from a Coral to a Corallimorph-Dominated Reef Associated with a Shipwreck on Palmyra Atoll
2008
Coral Reef Changes Linked to Shipwreck at Palmyra Atoll
publication
Evidence: moderate
Author Information
Author(s): Thierry M. Work, Greta S. Aeby, James E. Maragos
Primary Institution: U. S. Geological Survey-National Wildlife Health Center
Hypothesis
What factors contribute to phase shifts in coral reef ecosystems?
Conclusion
The study found that a shipwreck led to a significant invasion of corallimorphs, resulting in the loss of coral habitat.
Supporting Evidence
- High densities of corallimorphs were found near the shipwreck, decreasing with distance.
- Corallimorphs covered over 1 million square meters of reef area by mid-2007.
- Coral cover in areas at risk of overgrowth ranged from 6% to 64%.
Takeaway
When a ship sank near a coral reef, it caused a lot of new sea creatures called corallimorphs to grow, which took over the space where corals used to be.
Methodology
The researchers conducted diver surveys and benthic surveys to assess corallimorph density and coral health around the shipwreck.
Limitations
The study is observational and does not establish causation definitively.
Digital Object Identifier (DOI)
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