Standard Presentation Australian Marine Sciences Association Annual Meeting 2023

Coral Recruitment in Rubble beds on Heron Island Reef. (#70)

Roima Paewai-Huggins 1 , Tania Kenyon 1 , Peter Mumby 1
  1. School of Biological Sciences, University of Queensland, Brisbane, QLD, Australia

Coral reefs are under threat globally from a variety of both natural and anthropogenic stressors. Some of these stressors, particularly acute disturbances such as storms and ship groundings, can break up the corals reef framework into rubble. Movement in an unconsolidated rubble bed can restrict, delay, and interrupt coral cover recovery. The aim of this project is to investigate how coral recruitment processes vary across different types of rubble beds across a gradient of stability, i.e., an unconsolidated rubble bed, with loose and largely unbound rubble, and a relatively more stable rubble bed with interlocked and bound rubble pieces. This will be achieved by comparing rates of early coral settlement of coral recruits, among these habitats onto experimentally stabilized rubble substratum to the loose, natural rubble comprising the two rubble habitats. Results indicate that rates of coral settlement were greater on the experimentally stabilized rubble compared to the natural, loose rubble within both rubble habitats. Overall settlement, on either the stabilized or loose rubble, was greater in the rubble bed comprised of interlocked and bound pieces. Results suggests the importance of stability in rubble beds and implications for rubble stabilization as a restoration tool to help promote faster coral recovery.