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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
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Unhealthy Coral Reef, Kiritimi, Line Islands

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a frond of red algae
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Fronds of Nori

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The Amazon River carries all the rainwater that lands in the Amazon rainforest, covering some 2.1 million square miles, into the ocean. And with it, it carries vital nutrients like phosphorus, nitrogen and silicon.
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Where the Amazon Meets the Ocean

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Neptune grass (Posidonia oceanica) is a slow-growing and long-lived seagrass native to the Mediterranean.
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Fish Feeding in Seagrass

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A spiraled diatom with spines.
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A Diatom Helix

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An algal bloom, also known as a red tide, has converted the ocean's surf to a red color
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Red Tide

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Intense volcanic CO2 vents in Ili Ili Bua Bua, Normanby Island, Papua New Guinea.
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Will Coral Reefs Survive Acidification?

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A newly established black mangrove sits in a field of salt marsh near the northern limit of mangroves in Florida. Mangroves have been expanding near their northern limit in Florida and the expansion is linked to a reduction in the frequency of ex
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Finding Mangroves In Unexpected Places

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School of blue rockfish in a kelp bed.
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Stinkin' Seaweed Makes Tasty Food for Coastal Animals

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Fish swimming in waters of Bay Islands, Honduras
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Improving Grades for the Mesoamerican Reef

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The vicious "killer shrimp."
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Rough Reputation: Are Invasive Species All Bad?

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
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Bringing Back Tampa Bay’s Seagrass

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