Substrate addition - artificial reef, Substrate Enhancement - Algae removal — Malilnep Channel, Bolinao

OPP-RZJZZ7permanent identifier · cite as oceanportfolio.org/p/OPP-RZJZZ7

Published as: Enhancement of Grazing Gastropod Populations as a Coral Reef Restoration Tool: Predation Effects and Related Applied Implications | Technique: Substrate addition - artificial reef, Substrate Enhancement - Algae removal | Disturbance addressed: Overfishing | Genera: Pocillopora, Acropora, Porites, Montipora, Echinopora | Method: Factorial experiment with 42 experimental Reef Balls (tm): 14 with transplanted corals at low density (9.5 /m2), 14 at high density (19/m2), and 14 without coral transplants (control). Half of the Reef Balls (tm) in each treatment category were stocked with cultured trochus shells. Trochus niloticus were spawned and reared in aquaria for 5-6 months before release onto reef balls. Trochus were stocked at high densities that were continuously maintained over 6 months. | Survival of transplants reported by the source: 74% | Post-restoration monitoring: 6 months | Authors' conclusion: The addition of an algal grazer did not enhance coral growth/recruitment on artificial reefs. No difference in recruitment, recruit/transplanted coral survival in either treatment. Speculate that octopus may have consumed large proportion of shells, reducing densities below those required to have an impact on algae cover. | Lessons reported: Even heavily fished reefs that have been depleted of herbivores can have sufficient densities of octopus to feed on trochus shells. Therefore, the authors recommend adding refugia for trochus grazers that protect them from predators. | This record was compiled from a published source and has not been confirmed by the organisation that carried out the work. No contribution to the condition index is recorded: the source reports survival of transplanted material, which is not a measure of ecosystem condition.

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