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Two nurse sharks hover over a baited cage
Lesson Plan

In Hot Water

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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
Article

Finding Mangroves In Unexpected Places

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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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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
Photo

Unhealthy Coral Reef, Kiritimi, Line Islands

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Convict surgeonfish are the roaming sheep of the reef but, instead of noshing on grass, they feed on algae.
Article

Helpful Herbivores

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

Bugs and Slugs: The Hidden Secret to Healthy Seagrasses

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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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two mangrove trees in the crashing waves
Overview

Mangroves

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Sea otters floating on the surface of the ocean.
Article

Not Just Another Fuzzy Face

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Sargassum forms dense clumps up to the size of a beach ball that slowly rotate as they drift.
Article

Too Much of a Good Thing—the Atlantic Sargassum Belt

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scientist Drew-Baker reads a book by her microscope
Article

Saving Nori

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The vicious "killer shrimp."
Article

Rough Reputation: Are Invasive Species All Bad?

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