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Coral reefs are highly productive ecosystems that raise a conundrum called "Darwin's paradox": How can high production flourish in low-nutrient conditions? Here scientists show that in three abundant Caribbean sponges, the granules that have been commonly observed in sponge tissue for decades are polyphosphate granules. They provide evidence that these granules are of bacterial origin and propose a P sequestration pathway by microbial symbionts and the sponge hosts. [Source: Proceedings of the National Academy of Sciences of the United States of America]
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