Appearance
Red mangroves are easily distinguishable through their unique prop roots system and viviparous seeds. The prop roots of a red mangrove suspend it over the water, thereby giving it extra support and protection. They also help the tree to combat hypoxia by allowing it a direct intake of oxygen through its root structure.A mangrove can reach up to 80 feet in height in ideal conditions; however, it is commonly found at a more modest 20 feet. Its bark is thick and a grey-brown color. Mangrove leaves are 1–2 inches wide and 3–5 inches broad, with smooth margins and an ellipse shape. They are a darker shade of green on the tops than on the bottoms. The tree produces pale yellow flowers in the spring.
Naming
As well as the English name "red mangrove", "R. mangle" is known in Tonga as "tongo".
Habitat
Red mangroves are found in subtropical and tropical areas in both hemispheres, extending to approximately 28°N to S latitude. They thrive on coastlines in brackish water and in swampy salt marshes. Because they are well adapted to salt water, they thrive where many other plants fail and create their own ecosystems, the mangals. Red mangroves are often found near white mangroves, black mangroves, and buttonwood. Through stabilisation of their surroundings, mangroves create a community for other plants and animals to survive. Though rooted in soil, mangrove roots are often submerged in water for several hours or on a permanent basis. The roots are usually sunk in a sand or clay base, which allows for some protection from the waves.
Reproduction
As a viviparous plant, "R. mangle" creates a propagule that is in reality a living tree. Though resembling an elongated seed pod, the fully-grown propagule on the mangrove is capable of rooting and producing a new tree. The trees are hermaphrodites, capable of self pollination or wind pollination. The tree undergoes no dormant stage as a seed, but rather progresses to a live plant before leaving its parent tree. A mangrove propagule may float in brackish water for over a year before rooting.References:
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