Enhancing alpha and beta diversity on vertical seawalls by retrofitting eco-engineered panels

Area of Science:

• Marine Ecology
• Coastal Engineering
• Biodiversity Studies

Background:

• Surface heterogeneity impacts intertidal epibiota alpha diversity but its effect on beta diversity is understudied.
• Vertical seawalls offer limited habitat complexity for marine life.

Purpose of the Study:

• To investigate the influence of eco-engineered panels on alpha and beta diversity of intertidal epibiota.
• To compare biodiversity metrics between eco-engineered panels and traditional seawalls.
• To assess the potential of eco-engineered designs to enhance marine communities.

Main Methods:

• Two eco-engineered panel designs were installed on vertical seawalls in Hong Kong.
• Panels and scraped control plots were monitored quarterly for epibiotic alpha diversity over two years.
• Beta diversity was assessed after two years of panel deployment.

Main Results:

• Over 30% of taxa were unique to the eco-engineered panels, compared to 5% on control plots.
• Within-site beta diversity was 10-40% higher on panels than unmodified seawalls.
• Filter feeders and habitat-forming taxa were more abundant on panels.

Conclusions:

• Eco-engineered panels effectively enhance both alpha and beta diversity of intertidal epibiota.
• These panels enrich the biological community on artificial coastal structures.
• The study demonstrates the value of eco-engineering for marine habitat restoration.