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Branching coral in naturally acidic water.
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Fragile Branching Corals in Acidic Water

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Two nurse sharks hover over a baited cage
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Off Base

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A pair of sea butterflies float in the Arctic ocean.
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Searching for the Ocean Acidification Signal

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A graph showing rising levels of CO2 in the atmosphere over time.
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Ocean Acidification Graph

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But closer to the CO2 seeps, the complex reef has been replaced by a “monoculture” of boulder corals.
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Monoculture of Boulder Corals

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Acidic waters are also able to completely dissolve coral skeletons.
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Dissolving Coral Skeleton in Acidic Waters

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Intense volcanic CO2 vents in Ili Ili Bua Bua, Normanby Island, Papua New Guinea.
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Carbon Dioxide Volcanic Seep

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Where the pH is the lowest, corals can no longer grow - sand, rubble and seagrasses replace the reef.
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Lonely Seagrass in Acidic Waters

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GEOMAR scientist Armin Form works at his lab during a long-term experiment on the effects of lower pH, higher temperatures and "food stress" on the cold-water coral Lophelia pertusa.
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Deep-water Corals and Acidification

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Two nurse sharks hover over a baited cage
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Caribbean Coral Reef and Climate Case Study

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
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Coralline Algae: The Unsung Architects of Coral Reefs

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Tiny organisms found on ARMS
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Traveling Around the World to Study the Future of the Ocean

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