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KNOWLEDGE BASE

Mangrove zonation: why different species grow in bands

Tide, salt and mud decide which mangrove species grows where, so forests form bands from sea to land.

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Beginner 2 min read ecologyspeciesformationsLamu

Walk from the sea edge of a mangrove forest towards dry land and the trees change. This banding is called zonation, and it is why Atlas maps mangrove not as one block but as species formations.

What drives it

  • Flooding. The seaward edge is flooded on almost every tide; the landward edge only on the highest spring tides.
  • Salt. Evaporation concentrates salt in the soil on the landward side, which only a few species tolerate.
  • Soil. Soft, fine mud close to the water and firmer, sandier ground further back suit different root systems.

A typical East African pattern

  1. Sonneratia alba and Avicennia marina on the open seaward fringe.
  2. Rhizophora mucronata (stilt roots) in the regularly flooded middle zone.
  3. Ceriops tagal and Bruguiera gymnorhiza in the drier inner zone.
  4. A salt flat or bare "sand and mudflat" behind the trees where only salt-loving plants survive.

In Atlas the Lamu map has seven formation classes such as "Rhizophora dominant" and "Mixture of Ceriops & Rhizophora". "Almost pure stand" means one species makes up nearly all of a patch; "dominant" means it leads but others are present; "mixture" names two leading species.

How to interpret it

A change in the formation mix over time is an early warning: it can show changing salinity or flooding before trees die.

Limits. Zones shift with local conditions, so the pattern above is a guide, not a rule.

Related reading

How mangroves store carbon in their soil

Waterlogged mud keeps dead roots and leaves from rotting, so mangrove soils hold most of the ecosystem's carbon.

The mangrove species of East Africa

Nine true mangrove species occur along the East African coast; four dominate the Lamu map.

Why mangroves matter

Mangroves store carbon, protect coasts, feed fisheries and support millions of people.

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