Algal blooms: Trouble in the tide pools

A harmful algal bloom is the suspected culprit of a die-off in 2011 of millions of purple sea urchins and six-starred sea stars in Northern California. Their disappearance is predicted to have long-term ecological consequences on their populations. As algal blooms are expected to increase with climate change and ocean acidification, similar mass mortality events are expected to increase, experts say.

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