A management approach that combines manual removal and outplanting native sea urchin is effective in reducing invasive, reef-smothering macroalgae by 85 percent on a coral reef off Oʻahu, according to researchers. Globally, the health of coral reefs is threatened due to rising ocean temperatures and ocean acidification. Local factors such as invasive macroalgae also pose a serious risk to coral reefs—monopolizing reef habitats and overgrowing and smothering native species, such as corals.
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