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Bentota River mangrove zonation: Rhizophora mucronata stilt roots vs Bruguiera gymnorhiza knee roots?

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M
Mia Estuary•910 rep

What distinct tidal flood tolerances and breathing root morphology separate red mangroves from black mangroves along the Bentota estuary?

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4 Answers from travellers

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The Bentota River estuary displays classic tropical mangrove zonation governed by tidal inundation frequency and soil salinity. The water's outer edge is pioneered by Red Mangroves (Rhizophora mucronata / Maha Kadol), which utilize prominent arching stilt roots (prop roots) studded with lenticels for gas exchange in submerged, anaerobic mud. Further inland where soil is slightly elevated and inundation occurs only at high spring tides, Black Mangroves (Bruguiera gymnorhiza / Mal Kadol) dominate, producing looping, knobby "knee roots" that emerge above the mud surface to absorb atmospheric oxygen.

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D
Dr Dharshani NARA•1910 rep

Rhizophora produces elongated, viviparous pencil-like propagules that germinate while still attached to the parent tree before dropping into tidal water.

21
M
Mia Estuary•910 rep

The landward transition zone hosts Apple Mangroves (Sonneratia caseolaris / Kirala), which produce vertical conical spike roots (pneumatophores) and edible fruit.

17
D
Dr Wasantha Flora•1840 rep

Motorized boat operators must throttle down to idle speed when passing through mangrove tunnels to prevent wave wake from eroding seedling roots.

14
S
Sarah Field Scout•1720 rep

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