Mangroves don't exist. Mangroves do.

When we think of a mangrove, most of us picture the same tree: a trunk rising out of the water, large arching roots and a green canopy overlooking the sea. In reality, mangrove is not the name of a single botanical species. It refers to a group of around 70 species of trees and shrubs which, although they belong to different plant families, have evolved similar characteristics to survive in the same environment: tropical and subtropical coastlines, where the sea meets the land.

Mangrove forests are among the most complex ecosystems on Earth precisely because they are not made up of a single species. Each mangrove occupies a different position along the shoreline, plays a specific ecological role and provides habitat for different animal communities. It is this diversity that makes mangrove forests so extraordinarily rich in life.

The Asian Mangrove: the architect of the coast

The Asian Mangrove (Rhizophora mucronata) is one of the most widespread mangrove species along the coasts of East Africa, Southeast Asia and many islands in the Indian Ocean. It grows where the sea meets the land, in areas flooded twice a day by the tides and characterised by soft, muddy soils.

Its most distinctive feature is its large stilt roots, which appear to lift the trunk above the water. These roots keep the tree stable even in unstable ground, reduce the force of incoming waves and trap sediments, gradually contributing to the formation of new land. Among this intricate network of roots, fish, crabs, molluscs and countless other animals find shelter. For many marine species, life begins here.

Its reproduction is another remarkable adaptation. The seed germinates while still attached to the parent tree, developing into a long green propagule. When it eventually falls, it may lodge directly in the mud or float for days—or even weeks—carried by ocean currents until it reaches a suitable shoreline where it can take root.

The Black Mangrove: the one that breathes through the soil

The Black Mangrove (Avicennia germinans) generally grows slightly farther inland than the Asian Mangrove, in areas that are still reached by the tides but remain exposed for longer periods.

Its most remarkable feature is its pneumatophores: slender vertical roots that emerge from the mud like thousands of pencils. These specialised structures allow the tree to absorb oxygen even when the soil is waterlogged and almost devoid of air.

Its leaves also contain glands that excrete excess salt. If you look closely, you can often see tiny white salt crystals on their surface. This is one of the adaptations that allows the Black Mangrove to thrive in highly saline environments.

The White Mangrove: in the middle ground

The White Mangrove (Laguncularia racemosa) usually occupies the innermost areas of the mangrove forest, where saltwater reaches less frequently and the soil remains more stable. It grows in a place that is not quite land and not quite water—a truly amphibious environment.

It has rounded leaves and a much less conspicuous root system than the other two species, but its ecological role is just as important. It helps stabilise the soil and forms a natural transition zone between the mangrove forest and inland vegetation.

Under normal conditions, it does not develop large aerial roots. However, when growing in oxygen-poor soils or areas subject to prolonged flooding, it can produce small emergent roots that help it breathe. It is yet another example of the extraordinary adaptability of mangroves.

Much more than three species

Asian, Black and White Mangroves are among the best-known species, but they represent only a small part of the extraordinary diversity of mangroves.

Across Asia, Africa and Oceania, many other genera thrive, including Bruguiera, Ceriops, Sonneratia and Xylocarpus, each with its own distinctive characteristics. Some develop even more elaborate root systems, while others produce propagules that germinate directly on the parent tree before falling into the water and drifting away with the currents.

Each species occupies a precise position along the coastline according to salinity, tidal patterns and soil type. This distribution is no coincidence: it is the result of millions of years of evolution.

An ecosystem built on diversity

From above, a mangrove forest may look like a uniform expanse of trees. But a closer look reveals a far more complex landscape, where different species coexist, alternate and complement one another, making life along the coast possible.

Some trap sediments, others oxygenate the soil, while others provide shelter for fish, birds, insects and reptiles. No single species could perform all of these functions on its own.

That is why conserving or restoring mangroves is about much more than planting trees. It means rebuilding an ecosystem while respecting its extraordinary diversity. Behind the word mangrove lies a small community of trees, each with its own story, its own adaptations and its own ecological role. And it is precisely this diversity that makes mangrove forests one of the most biodiverse ecosystems on the planet.