Study

Effect of artificial substratum material and resident adults on coral settlement patterns at Danjugan Island, Philippines

  • Published source details Reyes M.Z. & Yap H.T. (2001) Effect of artificial substratum material and resident adults on coral settlement patterns at Danjugan Island, Philippines. Bulletin of Marine Science, 69, 559-566.

Actions

This study is summarised as evidence for the following.

Action Category

Use settlement tiles made from unnatural materials to encourage natural coral settlement

Action Link
Coral Conservation
  1. Use settlement tiles made from unnatural materials to encourage natural coral settlement

    A randomized, replicated study in 1998 on sandy substrate at a coral reef at Danjugan Island, Sulu Sea, central Philippines (Reyes & Yap 2001), found that a higher number of stony coral larvae settled on tiles made from consolidated coral rubble or concrete than rubber, and more coral larvae settled on tiles placed within compared to outside an existing reef. After 4.5 months, the average number of stony coral larvae/tile was higher on coral rubble (within reef: 7.7; outside reef: 2.9) and concrete (within reef: 6.9; outside reef: 2.3) than rubber (within reef: 0.45; outside reef: 0.35) tiles and higher on tiles within the existing reef than outside. Almost all settled larvae were from two families (Pocilloporids: 87% within, 88% outside; Acroporids: 11% within, 12% outside). In February 1998, forty-eight 10 × 10 cm tiles comprising 16 each of coral-rubble-cement, concrete, and rubber were randomly arranged on 16 frames (one of each type/frame) and attached using wire ties. Eight frames were placed within an existing coral reef <0.25 m from live coral, and eight placed outside the reef area >5 m from live coral. Frames were placed 12 m deep, 30 cm above the sandy seabed. Frames were retrieved after 4.5 months and larvae were counted and identified under a microscope.   

    (Summarised by: Ann Thornton)

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