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A strain of this green seaweed, native to the Indian and Pacific Oceans, escaped public and private aquariums in California, Japan, Australia, and Monaco. It has spread widely in the Mediterranean, replacing native plants...
Both humans and sea lions get sick from eating fish and shellfish that have...
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Most people try to avoid rotting kelp at the beach. The feeling of a floating...
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When snorkeling in the Kahekili Herbivore Fisheries Management Area (KHFMA) in...

LATEST CATCH

Unlike the green, leafy algae we're used to seeing on the seafloor, coralline algae has a hard crust—which you can see here at the molecular level in a photo from a scanning electron microscope. Each coralline algae cell builds a...
Deep-sea corals miles away from the source of the Deepwater Horizon oil...
Johnson's seagrass ( Halophila johnsonii ) is the lone ocean plant species...

DIVE DEEPER

Around 100 million years ago, grass from land adapted to live and reproduce while submerged in seawater—the modern-day...
For more than two centuries, Boston Harbor has been a dumping ground. In 1773, colonists famously dumped shiploads of tea to protest taxes. But in recent decades, the harbor has received less tea and...
Macroscopic algae ( Ventricaria ventricosa ), also known as "bubble algae" or "sea pearl," is widespread algal species that can withstand low light. Each of the bubbles is a single cell, making it...
As Dampier studied the plants he encountered in Australia, he wrote that they were “for the most part unlike any I had seen elsewhere.” In fact, nearly all the plants Dampier observed were entirely...
When snorkeling in the Kahekili Herbivore Fisheries Management Area (KHFMA) in West Maui, I keep an eye out for certain kinds of fish. Not the brightest or the biggest, but those herbivores such as...
Broad-leaf seagrass ( Posidonia australis ) with algae epiphytes grows at Corner Inlet Marine National Park in Australia . The marine park protects large areas of seagrass habitat from fishing—but it...
Adult green sea turtles ( Chelonia mydas ) spend most of their time grazing in seagrass meadows. It's estimated that before Columbus arrived in America in 1492, the number of green turtles supported...
Seagrasses don't just provide shelter for free-swimming animals, but also are a habitat for non-moving organisms, such as this sea anemone. Sessile animals attached to blades are called epibionts,...
How do you explain a scientific paper in three minutes or less? What if you were being judged by a bunch of middle-schoolers in classrooms around the world… and you only had a month to do it? The...
Bull kelp ( Nereocystis ) becomes less valuable to grazers as it quickly rots.
Algae, like all organisms, normally grow in balance with their ecosystems, limited by the amount of nutrients in the water. But sometimes, certain species of algae reproduce so rapidly that they...
Neptune grass ( Posidonia oceanica ) is an ancient seagrass that is unique to the Mediterranean Sea. It is incredibly slow-growing; so slow that scientists estimate one large meadow that is 9.3 miles...
This beautiful marine diatom Chaetoceros debilis was caught in the North Sea. Not only are diatoms one of the most important oxygen producers on earth, they are also a vital link in the food chain...
Hardy head silversides ( Atherinomorus lacunosus ) are abundant fish in shallow water seagrass meadows throughout the Indo-Pacific that often form shoals. They feed primarily on zooplankton and small...
One of the first signs of a sick coral reef is seaweed creeping across the corals, stealing their precious sunny real estate. Healthy corals, however, aren't completely hopeless: in some reefs, small...
Both humans and sea lions get sick from eating fish and shellfish that have been feeding on harmful toxic algae. Studying the sick sea lions brings scientists closer to understanding and preventing...
In the ocean, microscopic forms of algae, known as dinoflagellates , can "bloom" into dense patches near the surface, often referred to as "red tides." Some of these harmful algal blooms (HABs) are...
Most people try to avoid rotting kelp at the beach. The feeling of a floating piece of seaweed wrapping around an ankle is enough to shake even the most steeled swimmer, and then there's the strong...
It is a well-known fact that for animals living in the deep sea, food can be scarce. The food that is around usually rains down from above as dead animals and organic particles from plankton living...
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