Sea Urchins Help Coral Grow in Marine Reserves
Author Information
Author(s): Coma Rafel, Serrano Eduard, Linares Cristina, Ribes Marta, Díaz David, Ballesteros Enric
Primary Institution: Centre d'Estudis Avançats de Blanes, Consejo Superior de Investigaciones Científicas, Blanes, Spain
Hypothesis
An increase in the abundance of a zooxanthellate coral that spatially competes with macroalgae could be mediated by sea urchins through the creation of barren areas that enhance coral settlement or survival.
Conclusion
The study found that increased sea urchin populations may facilitate the growth of the invasive coral Oculina patagonica by creating open spaces for coral recruitment.
Supporting Evidence
- Oculina patagonica has shown a 3-fold increase in abundance over the last 8 years.
- High recruitment played an important role in the increasing coral abundance.
- Sea urchins overgraze macroalgae, creating barren patches that facilitate coral recruitment.
Takeaway
Sea urchins eat a lot of algae, which helps coral grow by making space for it to settle. This means that more sea urchins can lead to more coral.
Methodology
The study assessed coral density and size at four locations in a Marine Protected Area over an 8-year period, examining the relationship between sea urchin and coral populations.
Limitations
The study was limited to a specific Marine Protected Area and may not be generalizable to other regions.
Statistical Information
P-Value
p=0.0011
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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