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![Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.](/sites/default/files/styles/3_2_small/public/2023-11/1_08-P03-G12_1.jpg.webp?itok=lTjZPM-8)
overview
Corals and Coral Reefs
Coral reefs are the most diverse of all marine ecosystems. They teem with life,......![Swimmers brave the waters in the shadow of a coal-fired power plant. Coal plants like this one emit CO2 into our atmosphere which is warming the planet and altering the chemistry of the ocean.](/sites/default/files/styles/3_2_small/public/2023-11/IH208271_smokestack_corbis_intro_1.jpg.webp?itok=hGv2yfBV)
overview
Climate Change
Today, carbon dioxide (CO2) levels in our atmosphere are the highest they've been......![Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.](/sites/default/files/styles/3_2_small/public/2023-11/4_01_R01_G02-full_1.jpg.webp?itok=1qv0Skn_)
slideshow
Zooxanthellae and Coral Bleaching
Tiny plant-like organisms called zooxanthellae live in the tissues of many...![A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.](/sites/default/files/styles/3_2_small/public/2023-11/NWHI-full_1.JPG.webp?itok=Em09GF_n)
slideshow
Two Views of Coral Reefs: Thriving and Threatened
Coral reefs are beautiful, vibrant ecosystems that house roughly one quarter of...![a highly bleached coral reef](/sites/default/files/styles/3_2_small/public/2023-11/Andrea_Quattrini_-_Amamioshima20170906.jpg.webp?itok=iUhxpBlf)
Photo
Bleached
A highly bleached coral reef in the Pacific Ocean. ......![scuba divers swim over bleached stag corals](/sites/default/files/styles/3_2_small/public/2023-11/Andrea_Quattrini_-_Racha_Noi_20100620b.jpg.webp?itok=EFKUI3Wu)
Photo
White Corals in a Bleached Reef
Divers swimming over a bleached coral reef. ......![dead coral from disease](/sites/default/files/styles/3_2_large/public/2023-11/DSCN1988.JPG.webp?itok=TDhVisYJ)
Article
Sickness in the Sea: A Coral Plague Hits Florida
Florida corals had a rough 2014. During that year higher than normal ocean......
August 2019
![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.](/sites/default/files/styles/3_2_small/public/2023-11/Amphistegina-Hallock_92_1-full_1.jpg.webp?itok=vsGly77L)
Photo
Shallow Coral Reef Foraminifers
In this photo of a shallow coral reef in the Pacific there are three species of......![A photo of coral visibly affected by disease.](/sites/default/files/styles/3_2_small/public/2023-11/Diseasedcoral2.jpg.webp?itok=a8b7keaw)
Photo
Diseased Coral
A photo taken at a reef near Bocas del Toro, Panama. The reef suffered a mass......![Tawny Nurse Sharks Two nurse sharks hover over a baited cage](/themes/custom/a_clean_ocean/images/FinPrintCarousel2.jpg)
Lesson Plan
In Hot Water
This lesson combines Life Science and Investigation State Standards as it builds...![A coral head in the Mesoamerican Reef has both bleached and living coral. The white sections are bleached and the brown parts still contain zooxanthellae, the symbiotic algae that provide food to their coral hosts.](/sites/default/files/styles/3_2_large/public/2023-11/mesoamerican_reef_bleached_coral.jpeg.webp?itok=FV8V3z00)
Article
Coral Under Pressure: Monitoring Bleaching In Real Time
Vibrantly colored corals, with small fish darting about and sharks looking for......
December 2015