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mangrove

mangrove, large tropical evergreen tree, genus Rhizophora, that grows on muddy tidal flats and along protected ocean shorelines. Mangroves are most abundant in tropical Asia, Africa, and the islands of the SW Pacific. The American, or red, mangrove (Rhizophora mangle) is found along the muddy shores and in the everglades of the Florida peninsula and on other tropical American coast lines.

Mangroves produce from their trunks aerial roots that become embedded in the mud and form a tangled network; this serves both as a prop for the tree and as a means of aerating the root system. Such roots also form a base for the deposit of silt and other material carried by the tides, and thus land is built up which is gradually invaded by other vegetation. The mangrove forests also can protect inland coastal areas by absorbing the effects of storm and some tsunami waves, but many mangroves have been harvested destructively on a large scale. The bark is a rich source of tannins, and the wood is used for wharf pilings and other purposes.

Some mangrove species lack prop roots but have special pores on their branching root system for obtaining air. The mangrove fruit is a conical reddish brown berry. Its single seed germinates inside the fruit while it is still on the tree, forming a large, pointed primary root that quickly anchors the seedling in the mud when the fruit is dropped.

The name mangrove is also applied to other unrelated constituents of mangrove vegetation, such as Avicennia nitida, a bush of the vervain family, called black mangrove. True mangroves are classified in the division Magnoliophyta, class Magnoliopsida, order Rhizophorales, family Rhizophoraceae.

See P. B. Tomlinson, The Botany of Mangroves (1986).

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Rhizophoraceae

Rhizophoraceae A family of trees and shrubs of tropical rain forest, especially mangroves, in which the leaves are simple, usually opposite, and have caducous stipules. The flowers are hermaphrodite, with 3–16 perigynous or epigynous sepals and petals, 8 to many stamens on the edge of the receptacle, and the ovary superior to inferior. They are related to the Combretaceae. There are 16 genera, with about 130 species, with a pantropical distribution. Four genera occur as the main trees of mangrove forests, the other occur inland.

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mangrove

man·grove / ˈmanˌgrōv; ˈmang-/ • n. a tree or shrub (families Rhizophoraceae and Verbenaceae or Avicenniaceae) that grows in muddy, chiefly tropical coastal swamps, typically having numerous tangled roots above ground that form dense thickets. ∎  (also mangrove swamp) a tidal swamp that is dominated by mangroves and associated vegetation.

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mangrove swamp

mangrove swamp A region of vegetation, found along tropical coasts, in which mangrove trees (Rhizophora species) predominate. The waterlogged soil is highly saline, and – like other halophytes – mangroves are adapted to withstand these conditions; they also possess aerial roots (pneumatophores) through which gaseous exchange occurs, to counteract effects of the badly aerated soil.

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mangrove

mangrove Common name for any one of 120 species of tropical trees or shrubs found in marine swampy areas. Its stilt-like aerial roots, which arise from the branches and hang down into the water, produce a thick undergrowth, useful in the reclaiming of land along tropical coasts. Some species also have roots that rise up out of the water. Height: to 20m (70ft). Major family: Rhizophoraceae.

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mangrove forest

mangrove forest A swamp forest, of brackish or saline water, that develops on tropical and subtropical tidal mudflats (see TIDAL FLAT), particularly in quiet creeks and estuaries. Characteristically, mangrove forest is low and dense with a tangle of aerating roots projecting above the mud. Occasionally, substantial, lofty trees occur in the mangrove interior.

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mangrove swamp

mangrove swamp A characteristic vegetation of tropical, muddy coasts, and typically associated with river mouths where the water is shallow and the load of suspended sediment is high. The aerial roots of the mangrove trees trap the sediment, favouring the gradual seaward extension of the land area.

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mangrove swamp

mangrove swamp Characteristic vegetation of tropical, muddy coasts, and typically associated with river mouths where the water is shallow and the load of suspended sediment is high. The aerial roots of the mangrove trees trap the sediment, favouring the gradual seaward extension of the land area.

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mangrove forest

mangrove forest(mangal) A swamp forest of saline or brackish water, which develops on tropical and subtropical coasts (see tidal flat). Characteristically, mangrove forest has a dense tangle of aerating roots projecting above the mud. Virgin mangrove can reach 30 m tall.

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Rhizophora

Rhizophora (family Rhizophoraceae) An important genus of 6–9 species of mangrove trees which are pantropical in distribution and viviparous. Their timber is good for piles, scaffolding, and charcoal; the bark (cutch) is used for tanning.

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mangrove

mangrove tree of the genus Rhizophora. XVII. Early forms mangrowe, mangrave, later assim. to GROVE; obscurely connected with Pg. mangue, Sp. mangle.

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mangrove

mangrovebehove, clove, cove, dove, drove, fauve, grove, interwove, Jove, mauve, rove, shrove, stove, strove, trove, wove •alcove • mangrove

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Mangrove Swamp

Mangrove swamp


Mangrove swamps or forests are the tropical equivalent of temperate salt marshes. They grow in protected coastal embayments in tropical and subtropical areas around the world, and some scientists estimate that 60-75 percent of all tropical shores are populated by mangroves.

The term "mangrove" refers to individual trees or shrubs that are angiosperms (flowering plants) and belong to more than 80 species within 12 genera and five families. Though unrelated taxonomically, they share some common characteristics. Mangroves only grow in areas with minimal wave action, high salinity , and low soil oxygen. All of the trees have shallow roots, form pure stands, and have adapted to the harsh environment in which they grow. The mangrove swamp or forest community as a whole is called a mangal.

Mangroves typically grow in a sequence of zones from seaward to landward. This zonation is most highly pronounced in the Indo-Pacific regions, where 30-40 species of mangroves grow. Starting from the shore-line and moving inland, the sequence of genera there is Avicennia followed by Rhizophora, Bruguiera, and finally Ceriops. In the Caribbean, including Florida, only three species of trees normally grow: red mangroves (Rhizophora mangle ) represent the pioneer species growing on the water's edge, black mangroves (Avicennia germinans ) are next, and white mangroves (Laguncularia racemosa ) grow mostly inland. In addition, buttonwood (Conocarpus erectus ) often grows between the white mangroves and the terrestrial vegetation.

Mangrove trees have made special adaptations to live in this environment. Red mangroves form stilt-like prop roots that allow them to grow at the shoreline in water up to several feet deep. Like cacti, they have thick succulent leaves which store water and help prevent loss of moisture. They also produce seeds which germinate directly on the tree, then drop into the water, growing into a long, thin seedling known as a "sea pencil." These seedlings are denser at one end and thus float with the heavier hydrophilic (water-loving) end down. When the seedlings reach shore, they take root and grow. One acre of red mangroves can produce three tons of seeds per year, and the seeds can survive floating on the ocean for more than 12 months. Black mangroves produce straw-like roots called pneumatophores which protrude out of the sediment , thus enabling them to take oxygen out of the air instead of the anaerobic sediments. Both white and black mangroves have salt glands at the base of their leaves which help in the regulation of osmotic pressure.

Mangrove swamps are important to humans for several reasons. They provide water-resistant wood used in construction, charcoal, medicines, and dyes. The mass of prop roots at the shoreline also provides an important habitat for a rich assortment of organisms, such as snails, barnacles, oysters, crabs, periwinkles, jellyfish, tunicates, and many species of fish. One group of these fish, called mud skippers (Periophthalmus ), have large bulging eyes, seem to skip over the mud, and crawl up on the prop roots to catch insects and crabs. Birds such as egrets and herons feed in these productive waters and nest in the tree branches. Prop roots tend to trap sediment and can thus form new land with young mangroves. Scientists reported a growth rate of 656 feet (200 m) per year in one area near Java. These coastal forests can be helpful buffer zones to strong storms.

Despite their importance, mangrove swamps are fragile ecosystems whose ecological importance is commonly unrecognized. They are being adversely affected worldwide by increased pollution , use of herbicides, filling, dredging , channelizing, and logging .

See also Marine pollution; Wetlands

[John Korstad ]


RESOURCES

BOOKS

Castro, P., and M. E. Huber. Marine Biology. St. Louis: Mosby, 1992.

Nybakken, J. W. Marine Biology: An Ecological Approach. 2d ed. New York: Harper & Row, 1988.

Tomlinson, P. B. The Botany of Mangroves. Cambridge: Cambridge University Press, 1986.

Smith, R. E. Ecology and Field Biology. 4th ed. New York: Harper & Row, 1990.

PERIODICALS

Lugo, A. E., and S. C. Snedaker. "The Ecology of Mangroves." Annual Review of Ecology and Systematics 5 (1974): 3964.

Rützler, K., and C. Feller. "Mangrove Swamp Communities." Oceanus 30 (1988): 1624.

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