TitleOcean acidification reduces coral recruitment by disrupting intimate larval-algal settlement interactions
Publication TypeJournal Article
Year of Publication2012
AuthorsDoropoulos C, Ward S, Diaz-Pulido G, Hoegh-Guldberg O, Mumby PJ
Date PublishedApr
Type of ArticleArticle
ISBN Number1461-023X
Accession NumberBIOSIS:PREV201200316031
Keywords07002, Behavioral biology - General and comparative behavior, 07003,, 07506, Ecology: environmental, 07508, Ecology: environmental biology - Animal, 07512,, 10060, Biochemistry, 124-38-9, 64008, Invertebrata: comparative, experimental, Algae, Microorganisms,, Animals, Invertebrates, Behavior, Behavioral biology - Animal behavior, biology - Plant, carbon dioxide, Cnidaria [41000], coral]/Algae, Plantae, Ecology: environmental biology - Oceanography, interaction, Invertebrata, Animalia, Marine Ecology (Ecology, Environmental Sciences), morphology, physiology and pathology - Cnidaria, Nonvascular Plants, Plants, ocean acidification, coral recruitment, larval-algal settlement, Rhodophyta [14700], studies - General, [Acropora millepora, [Hydrolithon], [Titanoderma]
AbstractSuccessful recruitment in shallow reef ecosystems often involves specific cues that connect planktonic invertebrate larvae with particular crustose coralline algae (CCA) during settlement. While ocean acidification (OA) can reduce larval settlement and the abundance of CCA, the impact of OA on the interactions between planktonic larvae and their preferred settlement substrate are unknown. Here, we demonstrate that CO2 concentrations (800 and 1300 mu atm) predicted to occur by the end of this century significantly reduce coral (Acropora millepora) settlement and CCA cover by = 45%. The CCA important for inducing coral settlement (Titanoderma spp., Hydrolithon spp.) were the most deleteriously affected by OA. Surprisingly, the only preferred settlement substrate (Titanoderma) in the experimental controls was avoided by coral larvae as pCO2 increased, and other substrata selected. Our results suggest OA may reduce coral population recovery by reducing coral settlement rates, disrupting larval settlement behaviour, and reducing the availability of the most desirable coralline algal species for successful coral recruitment.