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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...
Macroscopic Algae ( Acetabularia crenulata ). More about mangrove ecosystems...
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This week at the Smithsonian Ocean Portal we embark on an experiment we're...
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This slideshow features illustrations of some of the plants and animals that...

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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 dangerous, producing toxins...
A strain of this green seaweed, native to the Indian and Pacific Oceans,...
Seagrasses growing on the seafloor of the Chesapeake Bay rely on light to...

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Around 100 million years ago, grass from land adapted to live and reproduce while submerged in seawater—the modern-day...
Over the past several decades, Florida’s coastal wetlands have been changing. Along the eastern shore, researchers have seen small mangrove trees appearing in areas further north than they usually...
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...
Bull kelp ( Nereocystis ) becomes less valuable to grazers as it quickly rots.
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...
Around 100 million years ago, grass from land adapted to live and reproduce while submerged in seawater—the modern-day seagrasses. This sea invasion by land plants happened four separate times,...
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...
Seagrasses growing on the seafloor of the Chesapeake Bay rely on light to grow—but, thanks to pollution, that sunlight has become more scarce. Nutrient runoff from fertilizers causes microscopic...
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,...
“Sea grapes” may sound like something Poseidon would snack on, and not a killer algae. Yet Caulerpa racemosa var. cylindracea poses a serious threat to marine life. Spread by the bilge water of boats...
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...
Deep-sea corals miles away from the source of the Deepwater Horizon oil spill in 2010 were impacted by the plumes. One affected site was 13.7 miles (22 km) away from the Macondo wellhead—the farthest...
Squids, octopuses and cuttlefish, such as this Australian Giant Cuttlefish ( Sepia apama ), compose just one group of animals that call seagrass beds home. Clams and worms bury themselves in the mud...
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...
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...
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...
Pick up any news article about invasive species and you may confuse it with a police blotter. Generally, invasive species are "almost bulletproof" "marauders," "terrorizing" ecosystems and wildlife...
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...
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...
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