Spatial variability in coral assemblages in the northeastern and central Red Sea

Area of Science:

• Marine Biology
• Coral Reef Ecology
• Conservation Science

Background:

• Coral reef ecosystems exhibit spatial variability in cover, composition, and population structure due to diverse environmental factors.
• The Red Sea's latitudinal and environmental gradients (temperature, salinity) may lead to distinct coral assemblages in different regions.

Purpose of the Study:

• To assess spatial differences in benthic coral cover, taxonomic composition, juvenile abundance, and size structure.
• To compare three coral genera (Acropora, Porites, Pocillopora) across two habitat types (reef crest, slope) in two Saudi Arabian Red Sea regions (northern and central).

Main Methods:

• Field surveys were conducted to quantify coral cover and demographic parameters.
• Data analysis focused on regional and habitat-specific variations in coral genera size structure and abundance.
• Juvenile coral densities were assessed across different sites and habitats.

Main Results:

• Northern Red Sea reefs had 42.6% higher coral cover than central Red Sea reefs.
• Coral colony size structure varied by genus, region, and habitat. Massive Porites colonies were larger in the north, while Acropora were larger on reef crests.
• Pocillopora abundance was lower in the central Red Sea, and juvenile coral densities were higher on northern reef slopes.

Conclusions:

• Spatial variations in coral assemblages are likely influenced by Red Sea environmental and latitudinal gradients and historical thermal stress.
• Tailored conservation strategies are recommended for specific Red Sea reef habitats and regions based on observed differences in coral cover and structure.