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Coastal ecosystems

The narrow region where land and ocean meet includes salt marshes, mangroves, wetlands, estuaries, reefs, and bays often linked in a network of physical, chemical, and biological interchanges.

Mangroves are like nursery schools for many of colorful fish that populate coral reefs. Among the roots and nutrient-rich waters in coastal mangrove swamps, juvenile fish get food and protection from predators until they mature and can migrate offshore to the reefs. These valuable nurseries are disappearing at an alarming rate, and so are the fish they support (Illustration by E. Paul Oberlander, Woods Hole Oceanographic Institution)

The narrow region where land and ocean meet is among the most dynamic and complex collection of physical and biological systems on Earth. These can include seagrass meadows, salt marshes, mangroves, wetlands, estuaries, reefs, and bays often linked in an intricate network of physical, chemical, and biological interchanges above and below the water. They are often highly productive, highly valued, and highly accessible, making them a natural intersection between the human and natural worlds. In addition to their role in the wider marine and terrestrial systems they link to, coastal ecosystems provide a broad range of benefits to humans. They can act as storm barriers and water filters, they are nurseries and habitat for commercially important plants and animals, and they are among the most popular tourist destinations. Coastal systems are also very sensitive to environmental conditions. Small changes in such things as temperature, salinity, nutrient availability, or sediment load, whether natural or human-induced, can have wide-ranging impacts.

Ocean Encounters: Vital Coasts

Life at the edge of land and sea! Salt marshes, kelp forests, and mangrove swamps are vibrant places, protecting coastlines, supporting diverse marine life, and helping regulate Earth’s climate. They also face a myriad of threats. Join us for a conversation about the science that helps us understand and protect these remarkable coastal ecosystems.

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Light micrograph of the benthic foraminifer Nonionella stella, which thrives in anoxic sulfidic sediments far below the euphotic zone. Individuals are ~225 microns in diameter. (Image credit: J.M. Bernhard © Woods Hole Oceanographic Institution)

Benthic life

Benthic animals live on the sea floor and are typically invertebrates, such as sea anemones, sponges, corals, sea stars, sea urchins, worms, mussels, crabs, and more.

tubeworms and crabs

Life at vents & seeps

Hydrothermal vents and cold seeps are places where chemical-rich fluids emanate from the seafloor, often providing the energy to sustain lush communities of life in some very harsh environments.

Polar life

By human standards, they are extreme environments. Yet life not only persists in the poles...it thrives.

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