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Two nurse sharks hover over a baited cage
Lesson Plan

Sea Surface Temperature and Coral Bleaching

Students will learn about how ocean temperature increase can be a cause of coral...
Mon, 11/30/2009 - 12:30
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GEOMAR scientist Armin Form works at his lab during a long-term experiment on the effects of lower pH, higher temperatures and "food stress" on the cold-water coral Lophelia pertusa.
Photo

Deep-water Corals and Acidification

GEOMAR scientist Armin Form works at his lab during a long-term experiment on the...
These bleached corals in the Gulf of Mexico are the result of increased water temperatures.
Photo

Bleached Corals

What is coral bleaching? These white corals in the Gulf of Mexico’s Flower Garden...
A photo of coral visibly affected by disease.
Photo

Diseased Coral

A photo taken at a reef near Bocas del Toro, Panama. The reef suffered a mass...
Compare the healthy coral on the left with the bleached coral on the right.
Photo

Bleached Corals, Pacific Ocean

Compare the healthy coral on the left with the bleached coral on the right....
UV light illuminates growth rings in a cross-section of 44-year-old Primnoa resedaformis coral found about 400 m (1,312 ft) deep off Newfoundland.
Photo

Coral Growth Rings

Ultraviolet light illuminates the growth rings in a cross-section of a 44-year-old...
In this photo of a shallow coral reef in the Pacific there are three species of forams. Their colors come from the symbiotic algae that live inside the foram shells.
Photo

Shallow Coral Reef Foraminifers

In this photo of a shallow coral reef in the Pacific there are three species of...
Purple, pink and green corals growing underwater on a metal fence-like substrate.
Photo

The Coral Gardener

When coral reefs are damaged, they sometimes struggle to grow back because there...
Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
slideshow

Zooxanthellae and Coral Bleaching

Tiny plant-like organisms called zooxanthellae live in the tissues of many animals,...
Thu, 12/03/2009 - 12:14
This orange boring sponge (Cliona varians) overgrows several coral species at Panama's Smithsonian Tropical Studies Institute.
Personal Perspectives

Ocean Acidification Excites Boring Sponges

Boring sponges get a bad rap. Their own name betrays them, announcing to the world...
March 2013
A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.
slideshow

Two Views of Coral Reefs: Thriving and Threatened

Coral reefs are beautiful, vibrant ecosystems that house roughly one quarter of all...
Tue, 12/15/2009 - 11:19
Nuclear bomb in Bikini Atoll

Naturally Resilient

Coral Reefs Can Recover From Disasters. How Can We Save Them From...
May 2013

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