Tag: Ecosystems

Natural History / Natural History - 5 years ago

What is a fish ladder?

Fish ladder near the south shore of Long Island, where recorded Alewive migration was occurring. The survival of many fish species depends on migrations up and down rivers. Among anadromous fish such as salmon, shad, and sturgeon, downstream m...

Natural History / Natural History - 5 years ago

What is shoreline armoring?

Shoreline armoring along Wells Beach, Maine. Coastal managers and property owners often attempt to stabilize coastal land and protect residential and commercial infrastructure along the coast by building shoreline armoring structures to hold back...

Natural History / Natural History - 6 years ago

What is the Sargasso Sea?

Mats of free-floating sargassum, a common seaweed found in the Sargasso Sea, provide shelter and habitat to many animals. Image credit: University of Southern Mississippi Gulf Coast Research Laboratory. The Sargasso Sea is a vast patch of ocea...

Natural History / Natural History - 6 years ago

What is a turkeyfish?

Lionfish (also known as turkeyfish) have venomous spines that can be very painful. Viewed from the right angle, the ornate fins of the lionfish resemble turkey plumage. That's why 'turkeyfish' is one of the many imaginative names people use wh...

Natural History / Natural History - 6 years ago

What is ghostfishing?

Atlantic croaker trapped within a derelict or "ghost" crab pot pulled from the York River in Virginia. Derelict fishing gear, sometimes referred to as "ghost gear," is any discarded, lost, or abandoned, fishing gear in the marine environment....

Natural History / Natural History - 6 years ago

Are sea cucumbers vegetables?

Chocolate chip sea cucumber found at Johnston Atoll. Most sea cucumbers are scavengers, moving along the seafloor and feeding on tiny particles of algae or microscopic marine animals collected with tube feet that surround their mouths. Found o...

Natural History / Natural History - 7 years ago

What is seaweed?

Kelp forest in the Channel Islands National Marine Sanctuary and National Park. Some seaweeds are microscopic, such as the phytoplankton that live suspended in the water column and provide the base for most marine food chains. Some are enormou...

Natural History / Natural History - 7 years ago

How did the Hawaiian Islands form?

The Hawaiian Emperor seamount chain is a well-known example of a large seamount and island chain created by hot-spot volcanism. Each island or submerged seamount in the chain is successively older toward the northwest. Near Hawaii, the age progre...

Natural History / Natural History - 7 years ago

Do the Great Lakes have tides?

View of the Holland, Michigan water level and meteorological station, located at the entrance to Macatawa Bay. Historic water level data has been collected in this vicinity since 1894. True tides—changes in water level caused by the gravitatio...

Natural History / Natural History - 7 years ago

What is a marine national monument?

Coral and Ulua found in the Papahānaumokuākea Marine National Monument. Coral reefs found in Papahānaumokuākea are home to over 7,000 marine species, one quarter of which are found only in the Hawaiian Archipelago. Marine monuments and nationa...