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Often it's the tiniest organisms that do the most harm. One example is microscopic algae, which can grow rapidly to form harmful algal blooms . Such blooms (some are called "red tides") create unhealthy...
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Over the past several decades, Florida’s coastal wetlands have been changing...
“Sea grapes” may sound like something Poseidon would snack on, and not a killer...
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The open ocean is surprisingly barren to the naked eye. Every now and again you...

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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 (such...
Seagrasses growing on the seafloor of the Chesapeake Bay rely on light to...
This beautiful bromeliad, also called an air plant because it gets its...

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Around 100 million years ago, grass from land adapted to live and reproduce while submerged in seawater—the modern-day...
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...
Even though the Amazon River and the ocean seem very different—the river is freshwater while the ocean is salty, the ocean is vast and deep compared to the Amazon—they are closely connected. The...
Smithsonian Marine Science Network Postdoctoral Fellow, Seabird McKeon, returns from the Smithsonian field site in Belize. Together with Dan Barshis of Stanford University, Seabird reports on the...
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...
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...
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...
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...
Stare at a tide pool and you will often see a crust of pink coating the bottom. No, this is not bubblegum from some careless teenager’s shoe: it’s a stony kind of seaweed that, like other seaweeds,...
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,...
Often it's the tiniest organisms that do the most harm. One example is microscopic algae, which can grow rapidly to form harmful algal blooms . Such blooms (some are called "red tides") create...
Closest to the seeps, where the pH is lowest and the water is most acidic, corals no longer grow. Instead there are sand, rubble and seagrasses that are able to survive. Read more about how reef...
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...
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...
Johnson's seagrass is the lone ocean plant species listed under the Endangered Species Act. Its flowing green stalks play an important role in coastal ecosystems where they act as nursery grounds for...
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,...
An invasive strain of the plant Phragmites australis dominates this Chesapeake Bay wetland. The plant can easily grow up to 3 meters (9.8 feet) tall and alter coastal ecosystems. Scientists at the...
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...
Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island. Few fish swim in the murky waters. The causes include pollution, overfishing, and increased water...
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