Coral reefs get a lot of love around here, and for good reason. But just a little closer to shore, another incredible ecosystem deserves some appreciation: mangrove forests.
Mangroves may look like a tangle of roots and leaves, but there’s a lot happening beneath the surface. They provide a habitat for marine life, help protect coastlines, store carbon, and do a whole lot more than you might expect.
In the spirit of appreciating the natural world that gives us so much, here are five reasons we’re grateful for mangroves.
But First, What are Mangroves?
Mangroves are salt-tolerant trees and shrubs that grow along tropical and subtropical coastlines where land and sea meet. Saltwater, changing tides, waterlogged soil, and very little oxygen around the roots would be a rough environment for most trees… mangroves, however, have some pretty incredible adaptations that allow them to thrive there.
Depending on the species, they can filter salt through their roots or get rid of excess salt through their leaves, while specialized roots help them cope with oxygen-poor soil. These adaptations allow mangrove forests to thrive in a place where most trees simply couldn’t.
Their ability to thrive in such a unique environment is impressive, but what mangroves do for the ecosystems around them is even more remarkable…
1. They Give Young Fish a Place to Grow
Take a look beneath the water around mangrove roots and you'll quickly understand why small fish like hanging around. That maze of roots provides food, shelter, and plenty of places for young fish and invertebrates to avoid larger predators.
Researchers studying mangroves, seagrass beds, and reefs in Bonaire found that these shallow habitats served as important nurseries for juvenile reef fish. Mangroves were particularly important for young schoolmaster snapper, gray snapper, great barracuda, and foureye butterflyfish.
2. They Help Support Life on the Reef
Mangroves, seagrass meadows, and coral reefs may look like separate worlds, but in places like the Caribbean, they're often connected parts of a much bigger ecosystem. Some fish use different habitats at different stages of their lives, eventually moving out of protected coastal areas and onto nearby reefs.
A landmark study published in Nature found that Caribbean reefs connected to mangroves had greater biomass of several commercially important fish species. For some species studied, adult biomass was more than double when reef habitat was connected to mangroves!
3. They Give Coastlines Some Extra Protection
Those tangled roots aren't only useful to fish. Mangrove roots help hold sediment in place, stabilize shorelines, and reduce erosion, while the vegetation can help dissipate wave energy.
That doesn't mean mangroves form an impenetrable wall against every storm. Coastal protection varies depending on the mangrove forest, local geography, water depth, and the storm itself. But healthy mangrove habitats are an important part of coastal resilience, especially in places where land and sea are constantly interacting.
4. They Store Carbon
A lot of the action in a mangrove forest is happening underground. Mangroves are considered blue carbon ecosystems, meaning they capture carbon and store it in coastal vegetation and sediments. Unlike a typical forest where we tend to picture carbon locked up in trunks and branches, mangrove ecosystems can store substantial amounts of carbon below ground in their soils. By keeping that carbon locked away, healthy mangrove forests play a role in limiting the amount of carbon dioxide in the atmosphere.
5. They’re Full of Life
Mangrove forests support a much bigger cast of characters. Sponges, algae, barnacles, and other organisms grow on submerged roots. Crabs and small fish move through the water below, while birds including herons, egrets, cormorants, pelicans, gulls, and terns use mangrove islands in the Florida Keys for nesting and roosting. NOAA even notes that nurse sharks can sometimes be spotted hunting for small crustaceans in shallow water near mangrove forests.
Protecting Mangroves
With everything mangroves do for our oceans and coastlines, they’re well worth protecting. We can help by keeping trash out of the water, respecting mangrove habitats when boating or fishing, and supporting local conservation and restoration efforts. Even learning more about the mangroves in your area (and sharing why they matter) can help build appreciation and awareness for these incredible coastal ecosystems.
One More Reason to Be Grateful
The more you learn about mangroves, the easier it is to find another reason to be grateful.
Maybe one of the biggest lessons mangroves give us is that healthy oceans are connected. Coral reefs don't exist in isolation. Neither do seagrass beds, mangrove forests, fish populations, or the coastlines surrounding them. Protecting the places we love means looking beyond any one habitat and appreciating how the whole coastal ecosystem works together.
At Grateful Diver, our love of the ocean goes hand in hand with wanting to protect the places that make time on and under the water possible. That’s why a portion of every Grateful Diver purchase supports Reef Relief and its work to improve and protect coral reef ecosystems through education, advocacy, and community involvement.