Summary
This in situ study exploited a natural volcanic CO₂ seep in Papua New Guinea to investigate how ocean acidification reshapes coral reef ecosystems. The research found that acidification-driven shifts from branching to massive coral architecture, rather than direct physiological or behavioural effects on fish, appear to be the primary driver of damselfish community restructuring, with assemblage abundances declining by 60–86%. The findings suggest that future reef fish communities will be more sensitive to habitat structural changes than to the direct effects of elevated pCO₂ on fish behaviour.
UK applicability
This study has limited direct applicability to UK farming or terrestrial food systems, though it provides relevant evidence for UK marine policy and climate adaptation strategies. The mechanistic insights into how climate stressors simplify biogenic habitats and cascade through community structure may inform UK approaches to marine ecosystem resilience and fisheries management under climate change.
Key measures
Coral architectural complexity; damselfish abundance (60–86% decline); habitat selection behaviour; anti-predator behaviour (boldness) on live versus dead branching corals; pCO₂ exposure
Outcomes reported
The study measured changes in coral architecture (branching to massive coral replacement) and associated fish assemblage composition at a volcanic CO₂ seep, with quantified abundance declines in damselfish species and experimental assessment of habitat preference behaviour.
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