Rhizophora mangle, the red mangrove,[1] is distributed in estuarine ecosystems throughout the tropics. Its viviparous "seeds", in actuality called propagules, become fully mature plants before dropping off the parent tree. These are dispersed by water until eventually embedding in the shallows.

Red mangrove
1796 Plate by Johannes Zorn
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malpighiales
Family:	Rhizophoraceae
Genus:	Rhizophora
Species:	R. mangle
Binomial name
Rhizophora mangle L.

Rhizophora mangle grows on aerial prop roots, which arch above the water level, giving stands of this tree the characteristic "mangrove" appearance. It is a valuable plant in Florida, Louisiana, and Texas coastal ecosystems. In its native habitat it is threatened by invasive species such as the Brazilian pepper tree (Schinus terebinthifolius). The red mangrove itself is considered an invasive species in some locations, such as Hawaii, where it forms dense, monospecific thickets.[2] R. mangle thickets, however, provide nesting and hunting habitat for a diverse array of organisms, including fish, birds, and crocodiles.

Distribution and habitat

Red mangroves are found in subtropical and tropical areas in both hemispheres, extending to near 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 (Laguncularia racemosa), black mangroves (Avicennia germinans), and buttonwood (Conocarpus erectus) though often more seaward than the other species. Through stabilization of their surroundings, mangroves create a community for other plants and animals (such as mangrove crabs). 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.

Specimens of Moesziomyces aphidis have been collected from water samples and on Rhizophora mangle leaves along the Perequê-Áçu River, in mangroves located in São Paulo State, Brazil.[3]

Description

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 ft (24 m) in height in ideal conditions, but it is commonly found at a more modest 20 ft (6.1 m). Its bark is thick and a grey-brown color. Mangrove leaves are 1–2 in (2.5–5.1 cm) wide and 3–5 in (7.6–12.7 cm) long, with smooth margins and an elliptical shape. They are a darker shade of green on the tops than on the bottoms. The tree produces yellow flowers in the spring.

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 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.

Gallery

• 
  A free-standing red mangrove tree growing in shallow water in the backcountry of the Cape Sable area of Everglades National Park.
• 
  Propagules growing before dropping from the parent plant in the Puerto Mosquito Bio Bay, Vieques.
• 
  A red mangrove forest in Fajardo, Puerto Rico.
• 
  Root structure above and below water.
• 
  An ecotourist on a kayak tunnel through red mangrove trees and roots at Lido Key.

See also

• Wetland

References

External links

Media related to Rhizophora mangle at Wikimedia Commons

• Rhizophora mangle images at bioimages.vanderbilt.edu
• https://web.archive.org/web/20100114230245/http://www.dpi.qld.gov.au/28_9227.htm More detailed information on the Red Mangrove.
• "Rhizophora mangle". Atlas of Living Australia.

На других языках

[es] Rhizophora mangle

[ru] Ризофора мангле