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Acidified algae, not larvae, block coral settlement
Six weeks of ocean acidification on crustose coralline algae halved Acropora settlement, but larvae still settled on ambient-conditioned CCA even at low pH.
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Why are CCA especially OA-sensitive?
Their carbonate has more magnesium-calcite than coral skeleton.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
What indirect OA pathway threatens coral recruitment?
Altering chemistry or composition of preferred settlement substrata.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
How long were CCA pretreated?
42 days across pH treatments.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
Settlement on pH 7.5–conditioned CCA?
12 ± 2% of larvae, about half of control.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
How much lower were pH 7.9 and 7.7 than control?
20% and 24% lower settlement.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
Did larvae fail to settle on ambient CCA at low pH?
No significant pH effect; overall ~31% settlement.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
Control settlement in experiment 2?
33 ± 2% at pH 8.1.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
Did 24 h larval OA block CCA-extract metamorphosis?
No—A. millepora and A. tenuis still responded.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
Which CCA genera matter most for recruitment?
Hydrolithon spp. and Titanoderma spp. (paper spelling Titanaderma).
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified
Did unsettled larvae look sick at low pH?
They still swam and explored; no obvious mortality.
Source: Ocean acidification reduces induction of coral settlement by crustose coralline algae · DOI · quote verified