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One of the most impressive photosynthesizers is a cyanobacterium called Prochlorococcus. It is estimated to be more abundant than any other photosynthesizer on the planet, and to be responsible for producing 20 percent of the oxygen in the atmosphere.
Video

Meet the obscure microbe that influences climate, ocean ecosystems, and perhaps even evolution

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Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
Article

With Every Breath You Take, Thank the Ocean

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Dr. Candy Feller, Senior Scientist at the Smithsonian Environmental Research Center underscores the challenges facing mangroves, along with reasons for hope. 
Video

Living on the Edge: Mangroves

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two mangrove trees in the crashing waves
Overview

Mangroves

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
Overview

Seagrass and Seagrass Beds

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
Photo

Seagrass Meadows as Food

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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Horizontal bands of color represent different species of lichen that have adapted to the conditions at different heights above sea level.
Article

Seaside Lichens

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A hippopotamus-like creature swims underwater
Article

Flippers or Feet? An Extinct Mammal May Have Been Replaced By Today's Sea Cows

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The vicious "killer shrimp."
Article

Rough Reputation: Are Invasive Species All Bad?

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School of blue rockfish in a kelp bed.
Article

Stinkin' Seaweed Makes Tasty Food for Coastal Animals

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Seagrasses don't just provide shelter for free-swimming animals, but also are a habitat for non-moving organisms, such as these sea anemones.
Photo

Anemone on Seagrass Blade

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