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Bull kelp (Nereocystis) becomes less valuable to grazers as it quickly rots.
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Nereocystis

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

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A close-up photo of Killer Algae, Caulerpa taxifolia, a seaweed that has proven to be a successful invasive species.
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Killer Algae (Caulerpa taxifolia)

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A close-up photo of the seeds on the plant Phragmites australis.
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Phragmites australis, seeds

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Adult green sea turtles spend most of their time grazing in seagrass meadows.
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Green Turtle in Seagrass

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Hardy head silversides (Atherinomorus lacunosus) are abundant fish in shallow water reef flat seagrass meadows throughout the Indo-Pacific.
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Seagrass and Shoal of Fish

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Broad-leaf seagrass (Posidonia australis) with algae epiphytes grows at Corner Inlet Marine National Park in Australia.
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Seagrass with Epiphytes

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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.
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Anemone on Seagrass Blade

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An Australian Giant Cuttlefish (Sepia apama) crosses a seagrass bed.
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Cuttlefish in Seagrass Bed

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In some reefs, small fishes such as this broad-barred goby protect corals by eating invading seaweeds.
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Coral Goby Cleans Coral

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

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How do plants respond to rising CO2 levels? To find out, plant physiologist Bert Drake monitors plants used in his CO2 study at the Smithsonian Environmental Research Center (SERC) near the Chesapeake Bay in Maryland.
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CO2 Marsh Study

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