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Mirissa coral reef larval recruitment tiles: ceramic settlement substrates and spat counts?

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Sarah Recruit•915 rep

How do marine scientists deploy unglazed terracotta settlement tiles across Mirissa reef shelves to monitor annual Acropora coral spat recruitment success?

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5 Answers from travellers

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Monitoring coral reef recovery and larval recruitment off Mirissa involves deploying standardized unglazed terracotta tiles across benthic reef stations. Coral planulae (swimming larvae) seeking settlement sites prefer rough, biofilmed micro-porous surfaces. Divers bolt pairs of terracotta tiles (10x10cm) vertically and horizontally onto stainless steel brackets anchored into dead coral pavement at 5 to 10 meters depth. Retrieved after three months of immersion, tiles are examined under stereo-microscopes to count newly settled calcified coral spat, providing vital data on local larval supply and reef resilience.

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Capt Roshan Marine•1720 rep

Tiles must be retrieved inside sealed underwater ziplock bags filled with seawater to prevent fragile newly metamorphosed coral recruits from drying out.

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Sarah Recruit•915 rep

High sedimentation from coastal construction covers settlement tiles in fine mud, blocking planulae from attaching to the terracotta surface.

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Elena Spectra•910 rep

Vertical tile orientation consistently attracts higher densities of settling coral recruits than horizontal upward-facing tiles by avoiding fine sediment accumulation.

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Max Rigging•925 rep

Coralline red algae crusts establishing on settlement tiles act as chemical beacon cues that stimulate coral planulae to settle and metamorphose.

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Clara Gastronomy•885 rep

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